tmux

Tested Software version 3.4 on Linux. The homepage URL of this terminal is https://github.com/tmux/tmux. Full results available at ucs-detect repository path data/tmux.yaml.

tmux is a terminal multiplexer. These tests were executed in host terminal :ref:`ghostty. The homepage URL of this host terminal is https://ghostty.org/.

Score Breakdown

Detailed breakdown of how scores are calculated for tmux:

#

Score Type

Raw Score

Final Scaled Score

1

WIDE

73.72%

67.2%

2

NARROW

99.70%

99.7%

3

ZWJ

80.62%

80.6%

4

LANG

92.21%

92.2%

5

VS16

97.89%

97.9%

6

VS15

0.00%

(excluded)

7

SRI

100.00%

100.0%

8

SFZ

100.00%

100.0%

9

RI

100.00%

100.0%

10

FEAT

13.89%

13.9%

11

Graphics

50%

50.0%

12

Resources

38.0%

38.0%

Score Comparison Plot:

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

../_images/tmux_scores_scaled.png

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

Final Scaled Score Calculation:

  • Raw Final Score: 79.55% (weighted average: WIDE + NARROW + ZWJ + LANG + VS16 + 0.33 * SRI + 0.33 * SFZ + RI + CAP + 0.5 * GFX) the categorized ‘average’ absolute support level of this terminal.

    Note

    RSC (Resources) is a composite CPU, memory, and runtime score, displayed for comparison but excluded from the final score 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: 66.2% (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 contested codepoints: 373

  • Total contested codepoints tested: 506

  • Formula: 373 / 506

  • Result: 73.72%

NARROW Score Details:

Narrow character support calculation:

  • Total successful contested codepoints: 5578

  • Total contested codepoints tested: 5595

  • Formula: 5578 / 5595

  • Result: 99.70%

ZWJ Score Details:

Emoji ZWJ (Zero-Width Joiner) support calculation:

  • Total successful sequences: 1165

  • Total sequences tested: 1445

  • Formula: 1165 / 1445

  • Result: 80.62%

VS16 Score Details:

Variation Selector-16 support calculation:

  • Errors: 9 of 426 codepoints tested

  • Success rate: 97.9%

  • Formula: 97.9 / 100

  • Result: 97.89%

Variation Selector-15 support:

Note

Interpretation of VS-15 is contested. Its width behavior is not consistently implemented across terminals; this measurement is informational and excluded from final scoring.

Variation Selector-15 support calculation:

  • Errors: 158 of 158 codepoints tested

  • Success rate: 0.0%

  • Formula: 0.0 / 100

  • Result: 0.00%

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: 5

  • Total codepoints tested: 5

  • Formula: 5 / 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 (2.5 / 18):

Raw score: 13.89%

Graphics Score Details:

Graphics protocol support (50%):

  • Sixel: yes

  • ReGIS: no

  • iTerm2: no

  • Kitty: no

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

Resource Score Details:

  • Duration: 52.0s

  • Mean CPU: 66.1%

  • Mean RSS: 235.8 MB

  • Resources Score: 38/100

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

  • Scaled result: 38.0%

LANG Score Details (Geometric Mean):

Geometric mean calculation:

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

  • About geometric mean

  • Result: 92.21%

Wide character support

Wide character support of tmux is 97.4% (1156 errors of 44568 codepoints tested).

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

#

Codepoint

Python

Category

wcwidth

Name

1

U+0001900A

‘\U0001900a’

Cn

2

na

Total codepoints: 1

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

    $ printf "\xf0\x99\x80\x8a|\\n12|\\n"
𙀊|
12|

Screenshot:

Terminal screenshot of the rendering discrepancy

Narrow character support

Narrow character support of tmux is 100.0% (17 errors of 36254 codepoints tested).

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

#

Codepoint

Python

Category

wcwidth

Name

1

U+324C

‘\u324c’

No

1

CIRCLED NUMBER FIFTY ON BLACK SQUARE

Total codepoints: 1

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

    $ printf "\xe3\x89\x8c|\\n1|\\n"
㉌|
1|

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

Emoji ZWJ support

Compatibility of tmux with the Unicode Emoji ZWJ sequence table is 80.6% (280 errors of 1445 sequences tested).

Sequence of an Emoji ZWJ Sequence, from midpoint of alignment failure records:

#

Codepoint

Python

Category

wcwidth

Name

1

U+0001F469

‘\U0001f469’

So

2

WOMAN

2

U+0001F3FD

‘\U0001f3fd’

Sk

2

EMOJI MODIFIER FITZPATRICK TYPE-4

3

U+200D

‘\u200d’

Cf

0

ZERO WIDTH JOINER

4

U+0001F430

‘\U0001f430’

So

2

RABBIT FACE

5

U+200D

‘\u200d’

Cf

0

ZERO WIDTH JOINER

6

U+0001F469

‘\U0001f469’

So

2

WOMAN

7

U+0001F3FB

‘\U0001f3fb’

Sk

2

EMOJI MODIFIER FITZPATRICK TYPE-1-2

Total codepoints: 7

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

    $ printf "\xf0\x9f\x91\xa9\xf0\x9f\x8f\xbd\xe2\x80\x8d\xf0\x9f\x90\xb0\xe2\x80\x8d\xf0\x9f\x91\xa9\xf0\x9f\x8f\xbb|\\n12|\\n"
👩🏽‍🐰‍👩🏻|
12|

Screenshot:

Terminal screenshot of the rendering discrepancy

Variation Selector-16 support

Emoji VS-16 results for tmux 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 tmux is 158 errors out of 158 total codepoints tested, 0.0% success. Sequence of a WIDE Emoji made NARROW by Variation Selector-15, from midpoint of alignment failure records:

#

Codepoint

Python

Category

wcwidth

Name

1

U+0001F3AE

‘\U0001f3ae’

So

2

VIDEO GAME

2

U+FE0E

‘\ufe0e’

Mn

0

VARIATION SELECTOR-15

Total codepoints: 2

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

    $ printf "\xf0\x9f\x8e\xae\xef\xb8\x8e|\\n1|\\n"
🎮︎|
1|

Screenshot:

Terminal screenshot of the rendering discrepancy

Standalone Regional Indicator support

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

Standalone Fitzpatrick modifier support

Standalone Fitzpatrick skin tone modifier support of tmux is 100.0% (0 errors of 5 codepoints tested).

Regional Indicator flag sequence support

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

Graphics Protocol Support

tmux supports the following graphics protocols: Sixel †.

Note: Must be compiled with sixel support. Check support and enablement with command: (tmux show-options -g;tmux show-window-options)|grep -i sixel

Detection Methods:

  • Sixel and ReGIS: Sixel: Detected; ReGIS: Not detected via the Device Attributes (DA1) query CSI c (\x1b[c). Sixel indicator (4): present, ReGIS indicator (3): not present.

  • Kitty graphics: Not detected by sending a Kitty graphics query and checking for an OK response.

  • iTerm2 inline images: Not detected by drawing a 1x1 transparent image, OSC 1337 ; File=inline=1, and checking that the cursor advanced a single column.

  • iTerm2 capabilities: Not detected via the OSC 1337 ; Capabilities query, which does not describe image support, and does not contribute to this score.

Device Attributes

  • Raw response: '\x1b[?1;2;4c'

  • Service class: 1 (VT100)

Detected Extensions:

Code

Description

2

Printer port

4

Sixel graphics

Language Support

The following 98 languages were tested with 100% success:

(Jinan), (Yeonbyeon), Aja, Amarakaeri, Arabic, Standard, Assyrian Neo-Aramaic, Baatonum, Bamun, Belanda Viri, Bora, Catalan (2), Chickasaw, Chinantec, Chiltepec, Chinese, Gan, Chinese, Hakka, Chinese, Jinyu, Chinese, Mandarin (Beijing), Chinese, Mandarin (Guiyang), Chinese, Mandarin (Harbin), Chinese, Mandarin (Nanjing), Chinese, Mandarin (Simplified), Chinese, Mandarin (Tianjin), Chinese, Mandarin (Traditional), Chinese, Min Nan, Chinese, Wu, Chinese, Xiang, Chinese, Yue, Colorado, Dagaare, Southern, Dangme, Dari, Dendi, Dinka, Northeastern, Ditammari, Dzongkha, Evenki, Farsi, Western, Fon, French (Welche), Fur, Ga, Gen, Gilyak, Gumuz, Japanese, Japanese (Osaka), Japanese (Tokyo), Kabyle, Korean, Lamnso’, Lao, Lingala (tones), Maldivian, Maori (2), Mazahua Central, Mirandese, Mixtec, Metlatónoc, Mongolian, Halh (Mongolian), Mòoré, Nanai, Navajo, Nuosu, Orok, Otomi, Mezquital, Panjabi, Eastern, Panjabi, Western, Pashto, Northern, Picard, Pular (Adlam), Saint Lucian Creole French, Secoya, Seraiki, Shan, Shipibo-Conibo, Sinhala, Siona, South Azerbaijani, Tagalog (Tagalog), Tai Dam, Tamazight, Central Atlas, Tamil, Tamil (Sri Lanka), Tem, Thai, Thai (2), Tibetan, Central, Ticuna, Uduk, Urdu, Urdu (2), Veps, Vietnamese, Vietnamese (Han nom), Waama, Yaneshaʼ, Yiddish, Eastern, Yoruba, Éwé.

The following 20 languages are not fully supported:

lang

n_errors

n_total

pct_success

Javanese (Javanese)

321

530

39.4%

Sanskrit

145

493

70.6%

Malayalam

233

844

72.4%

Bengali

95

385

75.3%

Marathi

85

391

78.3%

Hindi

82

390

79.0%

Sanskrit (Grantha)

61

293

79.2%

Khmer, Central

90

443

79.7%

Maithili

71

357

80.1%

Nepali

69

352

80.4%

Khün

74

419

82.3%

Tamang, Eastern

11

70

84.3%

Gujarati

50

343

85.4%

Magahi

43

314

86.3%

Bhojpuri

41

313

86.9%

Telugu

42

384

89.1%

Kannada

14

287

95.1%

Chakma

13

267

95.1%

Burmese

10

268

96.3%

Mon

7

332

97.9%

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+A9BA

‘\ua9ba’

Mc

0

JAVANESE VOWEL SIGN TALING

3

U+A9B4

‘\ua9b4’

Mc

0

JAVANESE VOWEL SIGN TARUNG

Total codepoints: 3

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

    $ printf "\xea\xa6\x8f\xea\xa6\xba\xea\xa6\xb4|\\n12|\\n"
ꦏꦺꦴ|
12|

Screenshot:

Terminal screenshot of the rendering discrepancy

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+0924

‘\u0924’

Lo

1

DEVANAGARI LETTER TA

4

U+093F

‘\u093f’

Mc

0

DEVANAGARI VOWEL SIGN I

Total codepoints: 4

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

    $ printf "\xe0\xa4\x95\xe0\xa5\x8d\xe0\xa4\xa4\xe0\xa4\xbf|\\n12|\\n"
क्ति|
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+0D15

‘\u0d15’

Lo

1

MALAYALAM LETTER KA

2

U+0D4D

‘\u0d4d’

Mn

0

MALAYALAM SIGN VIRAMA

3

U+0D15

‘\u0d15’

Lo

1

MALAYALAM LETTER KA

4

U+0D3E

‘\u0d3e’

Mc

0

MALAYALAM VOWEL SIGN AA

Total codepoints: 4

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

    $ printf "\xe0\xb4\x95\xe0\xb5\x8d\xe0\xb4\x95\xe0\xb4\xbe|\\n12|\\n"
ക്കാ|
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+0995

‘\u0995’

Lo

1

BENGALI LETTER KA

2

U+09BF

‘\u09bf’

Mc

0

BENGALI VOWEL SIGN I

3

U+0982

‘\u0982’

Mc

0

BENGALI SIGN ANUSVARA

Total codepoints: 3

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

    $ printf "\xe0\xa6\x95\xe0\xa6\xbf\xe0\xa6\x82|\\n12|\\n"
কিং|
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+0924

‘\u0924’

Lo

1

DEVANAGARI LETTER TA

4

U+093F

‘\u093f’

Mc

0

DEVANAGARI VOWEL SIGN I

Total codepoints: 4

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

    $ printf "\xe0\xa4\x95\xe0\xa5\x8d\xe0\xa4\xa4\xe0\xa4\xbf|\\n12|\\n"
क्ति|
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+094D

‘\u094d’

Mn

0

DEVANAGARI SIGN VIRAMA

3

U+0924

‘\u0924’

Lo

1

DEVANAGARI LETTER TA

4

U+093F

‘\u093f’

Mc

0

DEVANAGARI VOWEL SIGN I

Total codepoints: 4

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

    $ printf "\xe0\xa4\x95\xe0\xa5\x8d\xe0\xa4\xa4\xe0\xa4\xbf|\\n12|\\n"
क्ति|
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+00011315

‘\U00011315’

Lo

1

GRANTHA LETTER KA

2

U+0001133E

‘\U0001133e’

Mc

0

GRANTHA VOWEL SIGN AA

3

U+00011302

‘\U00011302’

Mc

0

GRANTHA SIGN ANUSVARA

Total codepoints: 3

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

    $ printf "\xf0\x91\x8c\x95\xf0\x91\x8c\xbe\xf0\x91\x8c\x82|\\n12|\\n"
𑌕𑌾𑌂|
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+17D2

‘\u17d2’

Mn

0

KHMER SIGN COENG

3

U+178A

‘\u178a’

Lo

1

KHMER LETTER DA

4

U+17C5

‘\u17c5’

Mc

0

KHMER VOWEL SIGN AU

Total codepoints: 4

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

    $ printf "\xe1\x9e\x80\xe1\x9f\x92\xe1\x9e\x8a\xe1\x9f\x85|\\n12|\\n"
ក្ដៅ|
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+094D

‘\u094d’

Mn

0

DEVANAGARI SIGN VIRAMA

3

U+0924

‘\u0924’

Lo

1

DEVANAGARI LETTER TA

4

U+093F

‘\u093f’

Mc

0

DEVANAGARI VOWEL SIGN I

Total codepoints: 4

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

    $ printf "\xe0\xa4\x95\xe0\xa5\x8d\xe0\xa4\xa4\xe0\xa4\xbf|\\n12|\\n"
क्ति|
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+0924

‘\u0924’

Lo

1

DEVANAGARI LETTER TA

4

U+093F

‘\u093f’

Mc

0

DEVANAGARI VOWEL SIGN I

Total codepoints: 4

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

    $ printf "\xe0\xa4\x95\xe0\xa5\x8d\xe0\xa4\xa4\xe0\xa4\xbf|\\n12|\\n"
क्ति|
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+1A6E

‘\u1a6e’

Mc

0

TAI THAM VOWEL SIGN E

3

U+1A60

‘\u1a60’

Mn

0

TAI THAM SIGN SAKOT

4

U+1A2F

‘\u1a2f’

Lo

1

TAI THAM LETTER DA

5

U+1A68

‘\u1a68’

Mn

0

TAI THAM VOWEL SIGN UUE

Total codepoints: 5

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

    $ printf "\xe1\xa8\xa0\xe1\xa9\xae\xe1\xa9\xa0\xe1\xa8\xaf\xe1\xa9\xa8|\\n12|\\n"
ᨠᩮ᩠ᨯᩨ|
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+0924

‘\u0924’

Lo

1

DEVANAGARI LETTER TA

4

U+093F

‘\u093f’

Mc

0

DEVANAGARI VOWEL SIGN I

Total codepoints: 4

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

    $ printf "\xe0\xa4\x95\xe0\xa5\x8d\xe0\xa4\xa4\xe0\xa4\xbf|\\n12|\\n"
क्ति|
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+0ACD

‘\u0acd’

Mn

0

GUJARATI SIGN VIRAMA

3

U+0A95

‘\u0a95’

Lo

1

GUJARATI LETTER KA

4

U+0ABE

‘\u0abe’

Mc

0

GUJARATI VOWEL SIGN AA

Total codepoints: 4

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

    $ printf "\xe0\xaa\x95\xe0\xab\x8d\xe0\xaa\x95\xe0\xaa\xbe|\\n12|\\n"
ક્કા|
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+0924

‘\u0924’

Lo

1

DEVANAGARI LETTER TA

4

U+093F

‘\u093f’

Mc

0

DEVANAGARI VOWEL SIGN I

Total codepoints: 4

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

    $ printf "\xe0\xa4\x95\xe0\xa5\x8d\xe0\xa4\xa4\xe0\xa4\xbf|\\n12|\\n"
क्ति|
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+094D

‘\u094d’

Mn

0

DEVANAGARI SIGN VIRAMA

3

U+0918

‘\u0918’

Lo

1

DEVANAGARI LETTER GHA

4

U+094D

‘\u094d’

Mn

0

DEVANAGARI SIGN VIRAMA

5

U+0918

‘\u0918’

Lo

1

DEVANAGARI LETTER GHA

6

U+093F

‘\u093f’

Mc

0

DEVANAGARI VOWEL SIGN I

7

U+094D

‘\u094d’

Mn

0

DEVANAGARI SIGN VIRAMA

Total codepoints: 7

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

    $ printf "\xe0\xa4\x95\xe0\xa5\x8d\xe0\xa4\x98\xe0\xa5\x8d\xe0\xa4\x98\xe0\xa4\xbf\xe0\xa5\x8d|\\n12|\\n"
क्घ्घि्|
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+0C15

‘\u0c15’

Lo

1

TELUGU LETTER KA

2

U+0C41

‘\u0c41’

Mc

0

TELUGU VOWEL SIGN U

3

U+0C02

‘\u0c02’

Mc

0

TELUGU SIGN ANUSVARA

Total codepoints: 3

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

    $ printf "\xe0\xb0\x95\xe0\xb1\x81\xe0\xb0\x82|\\n12|\\n"
కుం|
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+0C95

‘\u0c95’

Lo

1

KANNADA LETTER KA

2

U+0CBE

‘\u0cbe’

Mc

0

KANNADA VOWEL SIGN AA

3

U+0C82

‘\u0c82’

Mc

0

KANNADA SIGN ANUSVARA

Total codepoints: 3

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

    $ printf "\xe0\xb2\x95\xe0\xb2\xbe\xe0\xb2\x82|\\n12|\\n"
ಕಾಂ|
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+00011107

‘\U00011107’

Lo

1

CHAKMA LETTER KAA

2

U+00011133

‘\U00011133’

Mn

0

CHAKMA VIRAMA

3

U+00011120

‘\U00011120’

Lo

1

CHAKMA LETTER YYAA

4

U+0001112C

‘\U0001112c’

Mc

0

CHAKMA VOWEL SIGN E

Total codepoints: 4

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

    $ printf "\xf0\x91\x84\x87\xf0\x91\x84\xb3\xf0\x91\x84\xa0\xf0\x91\x84\xac|\\n12|\\n"
𑄇𑄳𑄠𑄬|
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+103B

‘\u103b’

Mc

0

MYANMAR CONSONANT SIGN MEDIAL YA

3

U+1031

‘\u1031’

Mc

0

MYANMAR VOWEL SIGN E

Total codepoints: 3

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

    $ printf "\xe1\x80\x80\xe1\x80\xbb\xe1\x80\xb1|\\n12|\\n"
ကျေ|
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+1007

‘\u1007’

Lo

1

MYANMAR LETTER JA

2

U+103C

‘\u103c’

Mc

0

MYANMAR CONSONANT SIGN MEDIAL RA

3

U+1031

‘\u1031’

Mc

0

MYANMAR VOWEL SIGN E

Total codepoints: 3

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

    $ printf "\xe1\x80\x87\xe1\x80\xbc\xe1\x80\xb1|\\n12|\\n"
ဇြေ|
12|

Screenshot:

Terminal screenshot of the rendering discrepancy

DEC Private Modes Support

This Terminal does not appear capable of reporting about any DEC Private modes.

Kitty Keyboard Protocol

tmux does not support the Kitty keyboard protocol.

XTGETTCAP (Terminfo Capabilities)

tmux does not support the XTGETTCAP sequence.

Text Sizing Protocol (OSC 66)

tmux does not support the Text Sizing protocol.

Tofu Detection

A tofu is the □ U+25A1 WHITE SQUARE placeholder box drawn in place of a codepoint the terminal’s font has no glyph for. Two protocols allow a program to ask which codepoints may ‘tofu’: mintty’s Font Glyph Coverage Enquiry and the Glyph Protocol implemented first by Rio.

tmux does not answer a font glyph coverage enquiry by either protocol, ‘tofus’ cannot be determined by automatic code.

Truecolor Support

tmux supports 24-bit truecolor, detectable via:

  • XTGETTCAP (RGB capability): no

  • DECRQSS (truecolor probe): no

  • COLORTERM: yes (truecolor)

Warning

COLORTERM is an environment variable, not a terminal query. It is not forwarded over SSH without SendEnv / AcceptEnv configuration, so detection via COLORTERM alone may be unreliable on remote hosts.

OSC 52 Clipboard Support

tmux does not advertise OSC 52 clipboard support via DA1 extension 52 or XTGETTCAP Ms.

  • DA1 extension 52: no

  • XTGETTCAP Ms: no

Terminal Identification

tmux is identified as tmux version 3.4 (detected via XTVERSION).

  • XTVERSION (raw): tmux 3.4

  • XTVERSION: yes

  • XTGETTCAP TN: no

  • ENQ: no

  • TERM_PROGRAM: yes (tmux)

  • TERM: yes (tmux-256color) (inherited from host terminal)

Reproduction

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

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

Test Performance

The test suite completed in 51.96 seconds (51s).

  • Mean CPU: 66.1%

  • Mean RSS: 235.8 MB

  • Total time: 52.0s

CPU usage over time

CPU usage during test execution for tmux.

RSS memory over time

RSS memory usage during test execution for tmux.

Duration comparison

Test duration for tmux compared to all other terminals.

CPU % vs Duration

CPU % vs duration trade-off for tmux.