kitty

Tested Software version 0.46.2 on Linux. The homepage URL of this terminal is https://sw.kovidgoyal.net/kitty/. Full results available at ucs-detect repository path data/kitty.yaml.

Score Breakdown

Detailed breakdown of how scores are calculated for kitty:

#

Score Type

Raw Score

Final Scaled Score

1

WIDE

100.00%

100.0%

2

NARROW

100.00%

100.0%

3

ZWJ

100.00%

100.0%

4

LANG

100.00%

100.0%

5

VS16

100.00%

100.0%

6

VS15

100.00%

(excluded)

7

SRI

100.00%

100.0%

8

SFZ

100.00%

100.0%

9

RI

100.00%

100.0%

10

FEAT

93.75%

100.0%

11

Graphics

100%

100.0%

12

Resources

15.2%

15.2%

Score Comparison Plot:

The following plot shows how this terminal’s scores compare to all other terminals tested.

../_images/kitty_scores_scaled.png

Scaled scores comparison across all metrics (normalized 0-100%)

Final Scaled Score Calculation:

  • Raw Final Score: 94.97% (weighted average: WIDE + NARROW + ZWJ + LANG + VS16 + 0.33 * SRI + 0.33 * SFZ + RI + CAP + 0.5 * GFX + 0.5 * RSC) the categorized ‘average’ absolute support level of this terminal.

    Note

    RSC (Resources) is a composite CPU, memory, and runtime score. RSC is weighted at 0.5 (half as powerful as other metrics). FEAT (Features) is the fraction of notable features supported. GFX (Graphics) scores 100% for modern protocols (iTerm2, Kitty), 50% for legacy only (Sixel, ReGIS), 0% for none.

  • Final Scaled Score: 100.0% (normalized across all terminals tested). Final Scaled scores are normalized (0-100%) relative to all terminals tested

WIDE Score Details:

Wide character support calculation:

  • Total successful codepoints: 501

  • Total codepoints tested: 506

  • Formula: 501 / 506

  • Result: 100.00%

NARROW Score Details:

Narrow character support calculation:

  • Total successful codepoints: 162

  • Total codepoints tested: 187

  • Formula: 162 / 187

  • Result: 100.00%

ZWJ Score Details:

Emoji ZWJ (Zero-Width Joiner) support calculation:

  • Total successful sequences: 1445

  • Total sequences tested: 1445

  • Formula: 1445 / 1445

  • Result: 100.00%

VS16 Score Details:

Variation Selector-16 support calculation:

  • Errors: 9 of 426 codepoints tested

  • Success rate: 97.9%

  • Formula: 97.9 / 100

  • Result: 100.00%

VS15 Score Details (excluded from final score):

Variation Selector-15 support calculation:

  • Errors: 0 of 158 codepoints tested

  • Success rate: 100.0%

  • Formula: 100.0 / 100

  • Result: 100.00%

SRI Score Details:

Standalone Regional Indicator support calculation:

  • Total successful codepoints: 26

  • Total codepoints tested: 26

  • Formula: 26 / 26

  • Result: 100.00%

SFZ Score Details:

Standalone Fitzpatrick skin tone modifier support calculation:

  • Total successful codepoints: 0

  • Total codepoints tested: 5

  • Formula: 0 / 5

  • Result: 100.00%

RI Score Details:

Regional Indicator flag sequence support calculation:

  • Total successful sequences: 262

  • Total sequences tested: 262

  • Formula: 262 / 262

  • Result: 100.00%

Features Score Details:

Notable terminal features (15.0 / 16):

Raw score: 93.75%

Graphics Score Details:

Graphics protocol support (100%):

  • Sixel: no

  • ReGIS: no

  • iTerm2: no

  • Kitty: yes

Scoring: 100% for modern (iTerm2/Kitty), 50% for legacy only (Sixel/ReGIS), 0% for none

Resource Score Details:

  • Duration: 73.2s

  • Mean CPU: 115.5%

  • Mean RSS: 704.4 MB

  • Resources Score: 15/100

  • Note: log-scale composite cost = log(CPU+1) + log(RSS+1) + log(time+1)

  • Scaled result: 15.2%

LANG Score Details (Geometric Mean):

Geometric mean calculation:

  • Formula: (p₁ × p₂ × … × pₙ)^(1/n) where n = 85 languages

  • About geometric mean

  • Result: 100.00%

Wide character support

Wide character support of kitty is 99.0% (5 errors of 506 codepoints tested).

Sequence of a WIDE character, from midpoint of alignment failure records:

#

Codepoint

Python

Category

wcwidth

Name

1

U+0001F3FD

‘\U0001f3fd’

Sk

2

EMOJI MODIFIER FITZPATRICK TYPE-4

Total codepoints: 1

  • Shell test using printf(1), '|' should align in output:

    $ printf "\xf0\x9f\x8f\xbd|\\n12|\\n"
🏽|
12|

  • See Line 42653 of ucs_wide.txt for this sequence in the example file.

Screenshot:

Terminal screenshot of the rendering discrepancy

Narrow character support

Narrow character support of kitty is 86.6% (25 errors of 187 codepoints tested).

Sequence of a NARROW character, from midpoint of alignment failure records:

#

Codepoint

Python

Category

wcwidth

Name

1

U+261D

‘\u261d’

So

1

WHITE UP POINTING INDEX

Total codepoints: 1

  • Shell test using printf(1), '|' should align in output:

    $ printf "\xe2\x98\x9d|\\n1|\\n"
☝|
1|

  • python wcwidth.wcswidth() measures width 1, while kitty measures width 2.

Emoji ZWJ support

Compatibility of kitty with the Unicode Emoji ZWJ sequence table is 100.0% (0 errors of 1445 sequences tested).

Variation Selector-16 support

Emoji VS-16 results for kitty is 9 errors out of 426 total codepoints tested, 97.9% success. Sequence of a NARROW Emoji made WIDE by Variation Selector-16, from midpoint of alignment failure records:

#

Codepoint

Python

Category

wcwidth

Name

1

U+0001F3CB

‘\U0001f3cb’

So

1

WEIGHT LIFTER

Total codepoints: 1

  • Shell test using printf(1), '|' should align in output:

    $ printf "\xf0\x9f\x8f\x8b|\\n1|\\n"
🏋|
1|

Screenshot:

Terminal screenshot of the rendering discrepancy

Variation Selector-15 support

Emoji VS-15 results for kitty is 0 errors out of 158 total codepoints tested, 100.0% success. All codepoint combinations with Variation Selector-15 tested were successful.

Standalone Regional Indicator support

Standalone Regional Indicator support of kitty is 100.0% (0 errors of 26 codepoints tested).

Standalone Fitzpatrick modifier support

Standalone Fitzpatrick skin tone modifier support of kitty is 0.0% (5 errors of 5 codepoints tested).

Sequence of a standalone Fitzpatrick modifier, from midpoint of alignment failure records:

#

Codepoint

Python

Category

wcwidth

Name

1

U+0001F3FD

‘\U0001f3fd’

Sk

2

EMOJI MODIFIER FITZPATRICK TYPE-4

Total codepoints: 1

  • Shell test using printf(1), '|' should align in output:

    $ printf "\xf0\x9f\x8f\xbd|\\n12|\\n"
🏽|
12|

Screenshot:

Terminal screenshot of the rendering discrepancy

Regional Indicator flag sequence support

Regional Indicator flag sequence support of kitty is 100.0% (0 errors of 262 sequences tested).

Graphics Protocol Support

kitty supports the following graphics protocols: Kitty graphics.

Detection Methods:

  • Sixel and ReGIS: Detected via the Device Attributes (DA1) query CSI c (\x1b[c). Extension code 4 indicates Sixel support, 3 ReGIS.

  • Kitty graphics: Detected by sending a Kitty graphics query and checking for an OK response.

  • iTerm2 inline images: Detected via the iTerm2 capabilities query OSC 1337 ; Capabilities.

Language Support

The following 57 languages were tested with 100% success:

Aja, Amarakaeri, Arabic, Standard, Assyrian Neo-Aramaic, Baatonum, Bamun, Belanda Viri, Bora, Catalan (2), Chickasaw, Chinantec, Chiltepec, Dagaare, Southern, Dari, Dendi, Dinka, Northeastern, Dzongkha, Evenki, Farsi, Western, Fon, French (Welche), Fur, Ga, Gen, Gilyak, Gumuz, Kabyle, Lamnso’, Lingala (tones), Maldivian, Maori (2), Mazahua Central, Mòoré, Nanai, Navajo, Orok, Otomi, Mezquital, Panjabi, Western, Pashto, Northern, Picard, Pular (Adlam), Secoya, Seraiki, Shipibo-Conibo, Siona, South Azerbaijani, Tagalog (Tagalog), Tai Dam, Tamazight, Central Atlas, Tem, Tibetan, Central, Ticuna, Uduk, Urdu (2), Vietnamese, Yaneshaʼ, Yiddish, Eastern, Yoruba.

The following 28 languages are not fully supported:

lang

n_errors

n_total

pct_success

Sanskrit

146

155

5.8%

Tamang, Eastern

10

11

9.1%

Malayalam

345

382

9.7%

Bengali

299

335

10.7%

Sanskrit (Grantha)

197

237

16.9%

Marathi

85

103

17.5%

Magahi

18

22

18.2%

Hindi

134

164

18.3%

Nepali

58

71

18.3%

Tamil

106

132

19.7%

Gujarati

216

290

25.5%

Javanese (Javanese)

362

488

25.8%

Bhojpuri

186

252

26.2%

Khmer, Central

287

390

26.4%

Maithili

46

66

30.3%

Telugu

231

335

31.0%

Khün

242

354

31.6%

Kannada

157

236

33.5%

Sinhala

101

198

49.0%

Panjabi, Eastern

103

236

56.4%

Burmese

89

223

60.1%

Chakma

84

225

62.7%

Mon

68

208

67.3%

Shan

11

106

89.6%

Thai (2)

1

14

92.9%

Thai

14

206

93.2%

Lao

10

227

95.6%

Urdu

1

23

95.7%

Sanskrit

Sequence of language Sanskrit from midpoint of alignment failure records:

#

Codepoint

Python

Category

wcwidth

Name

1

U+0915

‘\u0915’

Lo

1

DEVANAGARI LETTER KA

2

U+094D

‘\u094d’

Mn

0

DEVANAGARI SIGN VIRAMA

3

U+0915

‘\u0915’

Lo

1

DEVANAGARI LETTER KA

4

U+093E

‘\u093e’

Mc

0

DEVANAGARI VOWEL SIGN AA

Total codepoints: 4

  • Shell test using printf(1), '|' should align in output:

    $ printf "\xe0\xa4\x95\xe0\xa5\x8d\xe0\xa4\x95\xe0\xa4\xbe|\\n12|\\n"
क्का|
12|

Screenshot:

Terminal screenshot of the rendering discrepancy

Tamang, Eastern

Sequence of language Tamang, Eastern from midpoint of alignment failure records:

#

Codepoint

Python

Category

wcwidth

Name

1

U+0915

‘\u0915’

Lo

1

DEVANAGARI LETTER KA

2

U+094D

‘\u094d’

Mn

0

DEVANAGARI SIGN VIRAMA

3

U+0915

‘\u0915’

Lo

1

DEVANAGARI LETTER KA

4

U+094B

‘\u094b’

Mc

0

DEVANAGARI VOWEL SIGN O

Total codepoints: 4

  • Shell test using printf(1), '|' should align in output:

    $ printf "\xe0\xa4\x95\xe0\xa5\x8d\xe0\xa4\x95\xe0\xa5\x8b|\\n12|\\n"
क्को|
12|

Screenshot:

Terminal screenshot of the rendering discrepancy

Malayalam

Sequence of language Malayalam from midpoint of alignment failure records:

#

Codepoint

Python

Category

wcwidth

Name

1

U+0D05

‘\u0d05’

Lo

1

MALAYALAM LETTER A

2

U+0D02

‘\u0d02’

Mc

0

MALAYALAM SIGN ANUSVARA

Total codepoints: 2

  • Shell test using printf(1), '|' should align in output:

    $ printf "\xe0\xb4\x85\xe0\xb4\x82|\\n12|\\n"
അം|
12|

Screenshot:

Terminal screenshot of the rendering discrepancy

Bengali

Sequence of language Bengali from midpoint of alignment failure records:

#

Codepoint

Python

Category

wcwidth

Name

1

U+0985

‘\u0985’

Lo

1

BENGALI LETTER A

2

U+0982

‘\u0982’

Mc

0

BENGALI SIGN ANUSVARA

Total codepoints: 2

  • Shell test using printf(1), '|' should align in output:

    $ printf "\xe0\xa6\x85\xe0\xa6\x82|\\n12|\\n"
অং|
12|

Screenshot:

Terminal screenshot of the rendering discrepancy

Sanskrit (Grantha)

Sequence of language Sanskrit (Grantha) from midpoint of alignment failure records:

#

Codepoint

Python

Category

wcwidth

Name

1

U+00011305

‘\U00011305’

Lo

1

GRANTHA LETTER A

2

U+00011302

‘\U00011302’

Mc

0

GRANTHA SIGN ANUSVARA

Total codepoints: 2

  • Shell test using printf(1), '|' should align in output:

    $ printf "\xf0\x91\x8c\x85\xf0\x91\x8c\x82|\\n12|\\n"
𑌅𑌂|
12|

Screenshot:

Terminal screenshot of the rendering discrepancy

Marathi

Sequence of language Marathi from midpoint of alignment failure records:

#

Codepoint

Python

Category

wcwidth

Name

1

U+0915

‘\u0915’

Lo

1

DEVANAGARI LETTER KA

2

U+094D

‘\u094d’

Mn

0

DEVANAGARI SIGN VIRAMA

3

U+0915

‘\u0915’

Lo

1

DEVANAGARI LETTER KA

4

U+093E

‘\u093e’

Mc

0

DEVANAGARI VOWEL SIGN AA

5

U+0902

‘\u0902’

Mn

0

DEVANAGARI SIGN ANUSVARA

Total codepoints: 5

  • Shell test using printf(1), '|' should align in output:

    $ printf "\xe0\xa4\x95\xe0\xa5\x8d\xe0\xa4\x95\xe0\xa4\xbe\xe0\xa4\x82|\\n12|\\n"
क्कां|
12|

Screenshot:

Terminal screenshot of the rendering discrepancy

Magahi

Sequence of language Magahi from midpoint of alignment failure records:

#

Codepoint

Python

Category

wcwidth

Name

1

U+0915

‘\u0915’

Lo

1

DEVANAGARI LETTER KA

2

U+094D

‘\u094d’

Mn

0

DEVANAGARI SIGN VIRAMA

3

U+0930

‘\u0930’

Lo

1

DEVANAGARI LETTER RA

4

U+0942

‘\u0942’

Mn

0

DEVANAGARI VOWEL SIGN UU

Total codepoints: 4

  • Shell test using printf(1), '|' should align in output:

    $ printf "\xe0\xa4\x95\xe0\xa5\x8d\xe0\xa4\xb0\xe0\xa5\x82|\\n12|\\n"
क्रू|
12|

Screenshot:

Terminal screenshot of the rendering discrepancy

Hindi

Sequence of language Hindi from midpoint of alignment failure records:

#

Codepoint

Python

Category

wcwidth

Name

1

U+0915

‘\u0915’

Lo

1

DEVANAGARI LETTER KA

2

U+093E

‘\u093e’

Mc

0

DEVANAGARI VOWEL SIGN AA

3

U+0902

‘\u0902’

Mn

0

DEVANAGARI SIGN ANUSVARA

Total codepoints: 3

  • Shell test using printf(1), '|' should align in output:

    $ printf "\xe0\xa4\x95\xe0\xa4\xbe\xe0\xa4\x82|\\n12|\\n"
कां|
12|

Screenshot:

Terminal screenshot of the rendering discrepancy

Nepali

Sequence of language Nepali from midpoint of alignment failure records:

#

Codepoint

Python

Category

wcwidth

Name

1

U+0915

‘\u0915’

Lo

1

DEVANAGARI LETTER KA

2

U+094D

‘\u094d’

Mn

0

DEVANAGARI SIGN VIRAMA

3

U+091B

‘\u091b’

Lo

1

DEVANAGARI LETTER CHA

Total codepoints: 3

  • Shell test using printf(1), '|' should align in output:

    $ printf "\xe0\xa4\x95\xe0\xa5\x8d\xe0\xa4\x9b|\\n12|\\n"
क्छ|
12|

Screenshot:

Terminal screenshot of the rendering discrepancy

Tamil

Sequence of language Tamil from midpoint of alignment failure records:

#

Codepoint

Python

Category

wcwidth

Name

1

U+0B95

‘\u0b95’

Lo

1

TAMIL LETTER KA

2

U+0BBE

‘\u0bbe’

Mc

0

TAMIL VOWEL SIGN AA

Total codepoints: 2

  • Shell test using printf(1), '|' should align in output:

    $ printf "\xe0\xae\x95\xe0\xae\xbe|\\n12|\\n"
கா|
12|

Screenshot:

Terminal screenshot of the rendering discrepancy

Gujarati

Sequence of language Gujarati from midpoint of alignment failure records:

#

Codepoint

Python

Category

wcwidth

Name

1

U+0A95

‘\u0a95’

Lo

1

GUJARATI LETTER KA

2

U+0A83

‘\u0a83’

Mc

0

GUJARATI SIGN VISARGA

Total codepoints: 2

  • Shell test using printf(1), '|' should align in output:

    $ printf "\xe0\xaa\x95\xe0\xaa\x83|\\n12|\\n"
કઃ|
12|

Screenshot:

Terminal screenshot of the rendering discrepancy

Javanese (Javanese)

Sequence of language Javanese (Javanese) from midpoint of alignment failure records:

#

Codepoint

Python

Category

wcwidth

Name

1

U+A98F

‘\ua98f’

Lo

1

JAVANESE LETTER KA

2

U+A983

‘\ua983’

Mc

0

JAVANESE SIGN WIGNYAN

Total codepoints: 2

  • Shell test using printf(1), '|' should align in output:

    $ printf "\xea\xa6\x8f\xea\xa6\x83|\\n12|\\n"
ꦏꦃ|
12|

Screenshot:

Terminal screenshot of the rendering discrepancy

Bhojpuri

Sequence of language Bhojpuri from midpoint of alignment failure records:

#

Codepoint

Python

Category

wcwidth

Name

1

U+0915

‘\u0915’

Lo

1

DEVANAGARI LETTER KA

2

U+093E

‘\u093e’

Mc

0

DEVANAGARI VOWEL SIGN AA

Total codepoints: 2

  • Shell test using printf(1), '|' should align in output:

    $ printf "\xe0\xa4\x95\xe0\xa4\xbe|\\n12|\\n"
का|
12|

Screenshot:

Terminal screenshot of the rendering discrepancy

Khmer, Central

Sequence of language Khmer, Central from midpoint of alignment failure records:

#

Codepoint

Python

Category

wcwidth

Name

1

U+1780

‘\u1780’

Lo

1

KHMER LETTER KA

2

U+17B6

‘\u17b6’

Mc

0

KHMER VOWEL SIGN AA

Total codepoints: 2

  • Shell test using printf(1), '|' should align in output:

    $ printf "\xe1\x9e\x80\xe1\x9e\xb6|\\n12|\\n"
កា|
12|

Screenshot:

Terminal screenshot of the rendering discrepancy

Maithili

Sequence of language Maithili from midpoint of alignment failure records:

#

Codepoint

Python

Category

wcwidth

Name

1

U+0915

‘\u0915’

Lo

1

DEVANAGARI LETTER KA

2

U+093F

‘\u093f’

Mc

0

DEVANAGARI VOWEL SIGN I

3

U+0902

‘\u0902’

Mn

0

DEVANAGARI SIGN ANUSVARA

Total codepoints: 3

  • Shell test using printf(1), '|' should align in output:

    $ printf "\xe0\xa4\x95\xe0\xa4\xbf\xe0\xa4\x82|\\n12|\\n"
किं|
12|

Screenshot:

Terminal screenshot of the rendering discrepancy

Telugu

Sequence of language Telugu from midpoint of alignment failure records:

#

Codepoint

Python

Category

wcwidth

Name

1

U+0C05

‘\u0c05’

Lo

1

TELUGU LETTER A

2

U+0C02

‘\u0c02’

Mc

0

TELUGU SIGN ANUSVARA

Total codepoints: 2

  • Shell test using printf(1), '|' should align in output:

    $ printf "\xe0\xb0\x85\xe0\xb0\x82|\\n12|\\n"
అం|
12|

Screenshot:

Terminal screenshot of the rendering discrepancy

Khün

Sequence of language Khün from midpoint of alignment failure records:

#

Codepoint

Python

Category

wcwidth

Name

1

U+1A20

‘\u1a20’

Lo

1

TAI THAM LETTER HIGH KA

2

U+1A60

‘\u1a60’

Mn

0

TAI THAM SIGN SAKOT

3

U+1A20

‘\u1a20’

Lo

1

TAI THAM LETTER HIGH KA

Total codepoints: 3

  • Shell test using printf(1), '|' should align in output:

    $ printf "\xe1\xa8\xa0\xe1\xa9\xa0\xe1\xa8\xa0|\\n12|\\n"
ᨠ᩠ᨠ|
12|

Screenshot:

Terminal screenshot of the rendering discrepancy

Kannada

Sequence of language Kannada from midpoint of alignment failure records:

#

Codepoint

Python

Category

wcwidth

Name

1

U+0C85

‘\u0c85’

Lo

1

KANNADA LETTER A

2

U+0C82

‘\u0c82’

Mc

0

KANNADA SIGN ANUSVARA

Total codepoints: 2

  • Shell test using printf(1), '|' should align in output:

    $ printf "\xe0\xb2\x85\xe0\xb2\x82|\\n12|\\n"
ಅಂ|
12|

Screenshot:

Terminal screenshot of the rendering discrepancy

Sinhala

Sequence of language Sinhala from midpoint of alignment failure records:

#

Codepoint

Python

Category

wcwidth

Name

1

U+0D9A

‘\u0d9a’

Lo

1

SINHALA LETTER ALPAPRAANA KAYANNA

2

U+0DCF

‘\u0dcf’

Mc

0

SINHALA VOWEL SIGN AELA-PILLA

Total codepoints: 2

  • Shell test using printf(1), '|' should align in output:

    $ printf "\xe0\xb6\x9a\xe0\xb7\x8f|\\n12|\\n"
කා|
12|

Screenshot:

Terminal screenshot of the rendering discrepancy

Panjabi, Eastern

Sequence of language Panjabi, Eastern from midpoint of alignment failure records:

#

Codepoint

Python

Category

wcwidth

Name

1

U+0A15

‘\u0a15’

Lo

1

GURMUKHI LETTER KA

2

U+0A3E

‘\u0a3e’

Mc

0

GURMUKHI VOWEL SIGN AA

Total codepoints: 2

  • Shell test using printf(1), '|' should align in output:

    $ printf "\xe0\xa8\x95\xe0\xa8\xbe|\\n12|\\n"
ਕਾ|
12|

Screenshot:

Terminal screenshot of the rendering discrepancy

Burmese

Sequence of language Burmese from midpoint of alignment failure records:

#

Codepoint

Python

Category

wcwidth

Name

1

U+1000

‘\u1000’

Lo

1

MYANMAR LETTER KA

2

U+1031

‘\u1031’

Mc

0

MYANMAR VOWEL SIGN E

Total codepoints: 2

  • Shell test using printf(1), '|' should align in output:

    $ printf "\xe1\x80\x80\xe1\x80\xb1|\\n12|\\n"
ကေ|
12|

Screenshot:

Terminal screenshot of the rendering discrepancy

Chakma

Sequence of language Chakma from midpoint of alignment failure records:

#

Codepoint

Python

Category

wcwidth

Name

1

U+00011103

‘\U00011103’

Lo

1

CHAKMA LETTER AA

2

U+0001112C

‘\U0001112c’

Mc

0

CHAKMA VOWEL SIGN E

Total codepoints: 2

  • Shell test using printf(1), '|' should align in output:

    $ printf "\xf0\x91\x84\x83\xf0\x91\x84\xac|\\n12|\\n"
𑄃𑄬|
12|

Screenshot:

Terminal screenshot of the rendering discrepancy

Mon

Sequence of language Mon from midpoint of alignment failure records:

#

Codepoint

Python

Category

wcwidth

Name

1

U+1000

‘\u1000’

Lo

1

MYANMAR LETTER KA

2

U+1031

‘\u1031’

Mc

0

MYANMAR VOWEL SIGN E

3

U+102F

‘\u102f’

Mn

0

MYANMAR VOWEL SIGN U

Total codepoints: 3

  • Shell test using printf(1), '|' should align in output:

    $ printf "\xe1\x80\x80\xe1\x80\xb1\xe1\x80\xaf|\\n12|\\n"
ကေု|
12|

Screenshot:

Terminal screenshot of the rendering discrepancy

Shan

Sequence of language Shan from midpoint of alignment failure records:

#

Codepoint

Python

Category

wcwidth

Name

1

U+1004

‘\u1004’

Lo

1

MYANMAR LETTER NGA

2

U+1084

‘\u1084’

Mc

0

MYANMAR VOWEL SIGN SHAN E

Total codepoints: 2

  • Shell test using printf(1), '|' should align in output:

    $ printf "\xe1\x80\x84\xe1\x82\x84|\\n12|\\n"
ငႄ|
12|

Screenshot:

Terminal screenshot of the rendering discrepancy

Thai (2)

Sequence of language Thai (2) from midpoint of alignment failure records:

#

Codepoint

Python

Category

wcwidth

Name

1

U+0E22

‘\u0e22’

Lo

1

THAI CHARACTER YO YAK

2

U+0E48

‘\u0e48’

Mn

0

THAI CHARACTER MAI EK

3

U+0E33

‘\u0e33’

Lo

1

THAI CHARACTER SARA AM

Total codepoints: 3

  • Shell test using printf(1), '|' should align in output:

    $ printf "\xe0\xb8\xa2\xe0\xb9\x88\xe0\xb8\xb3|\\n12|\\n"
ย่ำ|
12|

Screenshot:

Terminal screenshot of the rendering discrepancy

Thai

Sequence of language Thai from midpoint of alignment failure records:

#

Codepoint

Python

Category

wcwidth

Name

1

U+0E01

‘\u0e01’

Lo

1

THAI CHARACTER KO KAI

2

U+0E33

‘\u0e33’

Lo

1

THAI CHARACTER SARA AM

Total codepoints: 2

  • Shell test using printf(1), '|' should align in output:

    $ printf "\xe0\xb8\x81\xe0\xb8\xb3|\\n12|\\n"
กำ|
12|

Screenshot:

Terminal screenshot of the rendering discrepancy

Lao

Sequence of language Lao from midpoint of alignment failure records:

#

Codepoint

Python

Category

wcwidth

Name

1

U+0E81

‘\u0e81’

Lo

1

LAO LETTER KO

2

U+0EB3

‘\u0eb3’

Lo

1

LAO VOWEL SIGN AM

Total codepoints: 2

  • Shell test using printf(1), '|' should align in output:

    $ printf "\xe0\xba\x81\xe0\xba\xb3|\\n12|\\n"
ກຳ|
12|

Screenshot:

Terminal screenshot of the rendering discrepancy

Urdu

Sequence of language Urdu from midpoint of alignment failure records:

#

Codepoint

Python

Category

wcwidth

Name

1

U+0601

‘\u0601’

Cf

1

ARABIC SIGN SANAH

2

U+06F1

‘\u06f1’

Nd

1

EXTENDED ARABIC-INDIC DIGIT ONE

Total codepoints: 2

  • Shell test using printf(1), '|' should align in output:

    $ printf "\xd8\x81\xdb\xb1|\\n12|\\n"
؁۱|
12|

Screenshot:

Terminal screenshot of the rendering discrepancy

DEC Private Modes Support

DEC private modes results for kitty: 7 changeable modes of 7 supported out of 8 total modes tested (87.5% support, 87.5% changeable).

Complete list of DEC private modes tested:

Mode

Name

Description

Supported

Changeable

Enabled

1004

FOCUS_IN_OUT_EVENTS

Send FocusIn/FocusOut events

Yes

Yes

No

1006

MOUSE_EXTENDED_SGR

Enable SGR Mouse Mode

Yes

Yes

No

2004

BRACKETED_PASTE

Set bracketed paste mode

Yes

Yes

No

2026

SYNCHRONIZED_OUTPUT

Synchronized Output

Yes

Yes

No

2027

GRAPHEME_CLUSTERING

Grapheme Clustering

No

No

No

2031

COLOR_PALETTE_UPDATES

Color palette updates

Yes

Yes

No

2048

IN_BAND_WINDOW_RESIZE

In-Band Window Resize Notifications

Yes

Yes

No

5522

BRACKETED_PASTE_MIME

Bracketed Paste MIME

Yes

Yes

No

Summary: 7 changeable, 1 not changeable.

Kitty Keyboard Protocol

kitty supports the Kitty keyboard protocol.

#

Flag

Key

State

1

Disambiguate escape codes

disambiguate

No

2

Report event types

report_events

No

3

Report alternate keys

report_alternates

No

4

Report all keys as escape codes

report_all_keys

No

5

Report associated text

report_text

No

Detection is performed by sending CSI ? u to query the current progressive enhancement flags. A terminal that supports this protocol responds with the active flags value.

XTGETTCAP (Terminfo Capabilities)

kitty supports the XTGETTCAP sequence and reports 220 terminfo capabilities (Full).

#

Capability

Description

Value

1

BD

Enter bold mode (kitty)

\E[?2004l

2

BE

Exit bold mode (kitty)

\E[?2004h

3

Cr

Set cursor color

\E]112\a

4

Cs

Reset cursor color

\E]12;%p1%s\a

5

Ms

Clipboard set

\E]52;%p1%s;%p2%s\E\

6

PE

Presentation end (kitty)

\E[201~

7

PS

Presentation start (kitty)

\E[200~

8

RV

Enter reverse mode (kitty)

\E[>c

9

Se

Reset underline style

\E[0\sq

10

Setulc

Set underline color

\E[58:2:%p1%{65536}%/%d:%p1%{256}%/%{255}%&%d:%p1%{255}%&...

11

Smulx

Styled underline

\E[4:%p1%dm

12

Ss

Set underline style

\E[%p1%d\sq

13

Su

Colored underlines

(empty)

14

Sync

Synchronized output

\EP=%p1%ds\E\

15

TN

Terminal name

xterm-kitty

16

Tc

Truecolor (24-bit RGB)

(empty)

17

XF

Extended functionality

(empty)

18

XR

Enter reset mode (kitty)

\E[>0q

19

acsc

Alternate character set

++\,\,--..00``aaffgghhiijjkkllmmnnooppqqrrssttuuvvwwxxyyz...

20

am

Auto right margin

(empty)

21

bel

Bell

\a

22

blink

Enter blink mode

\E[5m

23

bold

Enter bold mode

\E[1m

24

bw

Auto left margin

(empty)

25

ccc

Can redefine colors

(empty)

26

civis

Hide cursor

\E[?25l

27

clear

Clear screen

\E[H\E[2J

28

cnorm

Normal cursor

\E[?12h\E[?25h

29

colors

Max colors on screen

256

30

cols

Columns

80

31

cr

Carriage return

\r

32

csr

Change scroll region

\E[%i%p1%d;%p2%dr

33

cub

Cursor left n

\E[%p1%dD

34

cub1

Cursor left

\b

35

cud

Cursor down n

\E[%p1%dB

36

cud1

Cursor down

\n

37

cuf

Cursor right n

\E[%p1%dC

38

cuf1

Cursor right

\E[C

39

cup

Cursor address

\E[%i%p1%d;%p2%dH

40

cuu

Cursor up n

\E[%p1%dA

41

cuu1

Cursor up

\E[A

42

cvvis

Very visible cursor

\E[?12;25h

43

dch

Delete n characters

\E[%p1%dP

44

dch1

Delete character

\E[P

45

dim

Enter dim mode

\E[2m

46

dl

Delete n lines

\E[%p1%dM

47

dl1

Delete line

\E[M

48

dsl

Disable status line

\E]2;\E\

49

ech

Erase characters

\E[%p1%dX

50

ed

Clear to end of screen

\E[J

51

el

Clear to end of line

\E[K

52

el1

Clear to start of line

\E[1K

53

fd

Enter font mode (kitty)

\E[?1004l

54

fe

Exit font mode (kitty)

\E[?1004h

55

flash

Flash screen

\E[?5h$<100/>\E[?5l

56

fsl

From status line

\a

57

fullkbd

Full Kitty keyboard protocol

(empty)

58

home

Cursor home

\E[H

59

hpa

Horizontal position

\E[%i%p1%dG

60

hs

Has status line

(empty)

61

ht

Horizontal tab

\t

62

hts

Set tab stop

\EH

63

ich

Insert n characters

\E[%p1%d@

64

il

Insert n lines

\E[%p1%dL

65

il1

Insert line

\E[L

66

ind

Scroll forward

\n

67

indn

Scroll forward n

\E[%p1%dS

68

initc

Initialize color

\E]4;%p1%d;rgb:%p2%{255}%*%{1000}%/%2.2X/%p3%{255}%*%{100...

69

it

Init tabs

8

70

kDC

Shifted delete-char key

\E[3;2~

71

kDC3

Alt delete-char key

\E[3;3~

72

kDC4

Alt-Shift delete-char key

\E[3;4~

73

kDC5

Ctrl delete-char key

\E[3;5~

74

kDC6

Ctrl-Shift delete-char key

\E[3;6~

75

kDC7

Ctrl-Alt delete-char key

\E[3;7~

76

kDN

Shifted down-arrow key

\E[1;2B

77

kDN3

Alt down-arrow key

\E[1;3B

78

kDN4

Alt-Shift down-arrow key

\E[1;4B

79

kDN5

Ctrl down-arrow key

\E[1;5B

80

kDN6

Ctrl-Shift down-arrow key

\E[1;6B

81

kDN7

Ctrl-Alt down-arrow key

\E[1;7B

82

kEND

Shifted end key

\E[1;2F

83

kEND3

Alt end key

\E[1;3F

84

kEND4

Alt-Shift end key

\E[1;4F

85

kEND5

Ctrl end key

\E[1;5F

86

kEND6

Ctrl-Shift end key

\E[1;6F

87

kEND7

Ctrl-Alt end key

\E[1;7F

88

kHOM

Shifted home key

\E[1;2H

89

kHOM3

Alt home key

\E[1;3H

90

kHOM4

Alt-Shift home key

\E[1;4H

91

kHOM5

Ctrl home key

\E[1;5H

92

kHOM6

Ctrl-Shift home key

\E[1;6H

93

kHOM7

Ctrl-Alt home key

\E[1;7H

94

kIC

Shifted insert-char key

\E[2;2~

95

kIC3

Alt insert-char key

\E[2;3~

96

kIC4

Alt-Shift insert-char key

\E[2;4~

97

kIC5

Ctrl insert-char key

\E[2;5~

98

kIC6

Ctrl-Shift insert-char key

\E[2;6~

99

kIC7

Ctrl-Alt insert-char key

\E[2;7~

100

kLFT

Shifted left-arrow key

\E[1;2D

101

kLFT3

Alt left-arrow key

\E[1;3D

102

kLFT4

Alt-Shift left-arrow key

\E[1;4D

103

kLFT5

Ctrl left-arrow key

\E[1;5D

104

kLFT6

Ctrl-Shift left-arrow key

\E[1;6D

105

kLFT7

Ctrl-Alt left-arrow key

\E[1;7D

106

kNXT

Shifted next-page key

\E[6;2~

107

kNXT3

Alt next-page key

\E[6;3~

108

kNXT4

Alt-Shift next-page key

\E[6;4~

109

kNXT5

Ctrl next-page key

\E[6;5~

110

kNXT6

Ctrl-Shift next-page key

\E[6;6~

111

kNXT7

Ctrl-Alt next-page key

\E[6;7~

112

kPRV

Shifted previous-page key

\E[5;2~

113

kPRV3

Alt previous-page key

\E[5;3~

114

kPRV4

Alt-Shift previous-page key

\E[5;4~

115

kPRV5

Ctrl previous-page key

\E[5;5~

116

kPRV6

Ctrl-Shift previous-page key

\E[5;6~

117

kPRV7

Ctrl-Alt previous-page key

\E[5;7~

118

kRIT

Shifted right-arrow key

\E[1;2C

119

kRIT3

Alt right-arrow key

\E[1;3C

120

kRIT4

Alt-Shift right-arrow key

\E[1;4C

121

kRIT5

Ctrl right-arrow key

\E[1;5C

122

kRIT6

Ctrl-Shift right-arrow key

\E[1;6C

123

kRIT7

Ctrl-Alt right-arrow key

\E[1;7C

124

kUP

Shifted up-arrow key

\E[1;2A

125

kUP3

Alt up-arrow key

\E[1;3A

126

kUP4

Alt-Shift up-arrow key

\E[1;4A

127

kUP5

Ctrl up-arrow key

\E[1;5A

128

kUP6

Ctrl-Shift up-arrow key

\E[1;6A

129

kUP7

Ctrl-Alt up-arrow key

\E[1;7A

130

kbs

Backspace key



131

kcbt

Back-tab key

\E[Z

132

kcub1

Left arrow key

\EOD

133

kcud1

Down arrow key

\EOB

134

kcuf1

Right arrow key

\EOC

135

kcuu1

Up arrow key

\EOA

136

kdch1

Delete character key

\E[3~

137

kend

End key

\EOF

138

kf1

Function key F1

\EOP

139

kf10

Function key F10

\E[21~

140

kf11

Function key F11

\E[23~

141

kf12

Function key F12

\E[24~

142

kf2

Function key F2

\EOQ

143

kf3

Function key F3

\EOR

144

kf4

Function key F4

\EOS

145

kf5

Function key F5

\E[15~

146

kf6

Function key F6

\E[17~

147

kf7

Function key F7

\E[18~

148

kf8

Function key F8

\E[19~

149

kf9

Function key F9

\E[20~

150

khome

Home key

\EOH

151

kich1

Insert character key

\E[2~

152

kind

Scroll-down key

\E[1;2B

153

kitty-query-allow_hyperlinks

hyperlink support

yes

154

kitty-query-background

background color

#000000

155

kitty-query-background_opacity

background opacity

1

156

kitty-query-bold_font

bold font

FreeMonoBold

157

kitty-query-bold_italic_font

bold-italic font

FreeMonoBoldOblique

158

kitty-query-clipboard_control

clipboard control

write-clipboard write-primary read-clipboard-ask read-pri...

159

kitty-query-dpi_x

DPI X

96

160

kitty-query-dpi_y

DPI Y

96

161

kitty-query-font_family

font family

FreeMono

162

kitty-query-font_size

font size

11

163

kitty-query-foreground

foreground color

#dddddd

164

kitty-query-italic_font

italic font

FreeMonoOblique

165

kitty-query-name

terminal name

kitty

166

kitty-query-os_name

OS name

linux

167

kitty-query-version

version

0.47.1

168

km

Has meta key

(empty)

169

kmous

Mouse key

\E[M

170

knp

Next page key

\E[6~

171

kpp

Previous page key

\E[5~

172

kri

Scroll-up key

\E[1;2A

173

kxIN

Keyboard in (kitty)

\E[I

174

kxOUT

Keyboard out (kitty)

\E[O

175

lines

Lines

24

176

mc5i

Will not echo input

(empty)

177

mir

Move in insert mode

(empty)

178

msgr

Move in standout mode

(empty)

179

npc

No pad character

(empty)

180

oc

Original colors

\E]104\a

181

op

Original pair

\E[39;49m

182

pairs

Max color pairs

32767

183

query-os-name

OS name query

Linux

184

rc

Restore cursor

\E8

185

rep

Repeat character

%p1%c\E[%p2%{1}%-%db

186

rev

Enter reverse mode

\E[7m

187

ri

Reverse index

\EM

188

rin

Scroll reverse n

\E[%p1%dT

189

ritm

Exit italics mode

\E[23m

190

rmacs

Exit alternate charset mode

\E(B

191

rmam

Disable line wrap

\E[?7l

192

rmcup

Exit alt screen

\E[?1049l

193

rmir

Exit insert mode

\E[4l

194

rmkx

Keypad local mode

\E[?1l

195

rmso

Exit standout mode

\E[27m

196

rmul

Exit underline mode

\E[24m

197

rs1

Reset string 1

\E]\E\\Ec

198

sc

Save cursor

\E7

199

setab

Set background color

\E[%?%p1%{8}%<%t4%p1%d%e%p1%{16}%<%t10%p1%{8}%-%d%e48;5;%...

200

setaf

Set foreground color

\E[%?%p1%{8}%<%t3%p1%d%e%p1%{16}%<%t9%p1%{8}%-%d%e38;5;%p...

201

setrgbb

Set RGB background

\E[48:2:%p1%d:%p2%d:%p3%dm

202

setrgbf

Set RGB foreground

\E[38:2:%p1%d:%p2%d:%p3%dm

203

sgr

Set attributes

%?%p9%t\E(0%e\E(B%;\E[0%?%p6%t;1%;%?%p2%t;4%;%?%p1%p3%|%t...

204

sgr0

Reset attributes

\E(B\E[m

205

sitm

Enter italics mode

\E[3m

206

smacs

Enter alternate charset mode

\E(0

207

smam

Enable line wrap

\E[?7h

208

smcup

Enter alt screen

\E[?1049h

209

smir

Enter insert mode

\E[4h

210

smkx

Keypad transmit mode

\E[?1h

211

smso

Enter standout mode

\E[7m

212

smul

Enter underline mode

\E[4m

213

tbc

Clear all tabs

\E[3g

214

tsl

To status line

\E]2;

215

u6

CPR response format

\E[%i%d;%dR

216

u7

CPR request

\E[6n

217

u8

DA response format

\E[?%[;0123456789]c

218

u9

DA request

\E[c

219

vpa

Vertical position

\E[%i%p1%dd

220

xenl

Newline glitch

(empty)

The XTGETTCAP sequence (DCS + q Pt ST) allows applications to query terminfo capabilities directly from the terminal emulator, rather than relying on the system terminfo database.

Text Sizing Protocol (OSC 66)

kitty supports the Text Sizing protocol: explicit width (w), scale (s).

The Text Sizing protocol (OSC 66) allows terminal programs to display text at different sizes and to explicitly specify the cell width of characters. Detection is performed by measuring cursor movement after sending ESC ] 66 ; w=2 ; <space> BEL and ESC ] 66 ; s=2 ; <space> BEL.

Because this terminal supports the Text Sizing protocol, any application can programmatically set the displayed cell width of any character. This means that width errors for complex languages, emoji, variation selectors (VS15, VS16), standalone regional indicators and Fitzpatrick modifiers, and other problematic codepoints can be fully remediated at the application level. For this reason, kitty scores 100% on the WIDE, LANG, ZWJ, VS16, VS15, SRI, SFZ, and RI width tests.

Truecolor Support

kitty supports 24-bit truecolor, detectable via:

  • XTGETTCAP (RGB capability): no

  • DECRQSS (truecolor probe): yes (probe)

  • COLORTERM: yes (truecolor)

OSC 52 Clipboard Support

kitty supports OSC 52 clipboard operations (detected via XTGETTCAP Ms).

  • DA1 extension 52: no

  • XTGETTCAP Ms: yes

Terminal Identification

kitty is identified as kitty version 0.46.2 (detected via XTVERSION + XTGETTCAP TN).

  • XTVERSION (raw): kitty(0.47.1)

  • XTVERSION: yes

  • XTGETTCAP TN: yes (xterm-kitty)

  • ENQ: no

  • TERM_PROGRAM: no

  • TERM: yes (xterm-kitty)

Reproduction

To reproduce these results for kitty, install and run ucs-detect with the following commands:

uvx ucs-detect --rerun data/kitty.yaml

Test Performance

The test suite completed in 73.15 seconds (73s).

  • Mean CPU: 115.5%

  • Mean RSS: 704.4 MB

  • Total time: 73.2s

CPU usage over time

CPU usage during test execution for kitty.

RSS memory over time

RSS memory usage during test execution for kitty.

Duration comparison

Test duration for kitty compared to all other terminals.

CPU % vs Duration

CPU % vs duration trade-off for kitty.