Lean (proof assistant)

Lean - software for interactive and automated theorem proving. This programming language is the 271^st most popular in the global Wikipedia ranking of programming languages and the 250^th most popular programming language in English Wikipedia. Article “Lean (proof assistant)” in English Wikipedia has 52.9 points for quality (as of July 1, 2026). The article contains 44 references and 12 sections.

In this language version of Wikipedia the article has the best quality. Also, this article is the most popular in that (English) language version.

In June 2026 the article “Lean (proof assistant)” was edited by 3 authors in English Wikipedia and written by 7 authors in all languages.

Since the creation of article “Lean (proof assistant)”, its content was written by 82 registered users of English Wikipedia and edited by 162 registered Wikipedia users in all languages.

Lean is on the 250^th place in local ranking of programming languages in English Wikipedia and on the 271^st place in global ranking of programming languages in all the time.

The article is cited 360 times in English Wikipedia and cited 529 times in all languages.

The highest Authors Interest rank from 2001:

• Local (English): #18192 in October 2023
• Global: #28783 in June 2024

The highest popularity rank from 2008:

• Local (English): #72307 in April 2026
• Global: #88378 in April 2026

There are 14 language versions for this article in the WikiRank database (of the considered 55 Wikipedia language editions).

The quality and popularity assessment was based on Wikipédia dumps from July 1, 2026 (including revision history and pageviews for previous years).

The table below shows the language versions of the article with the highest quality.

#	Language	Quality grade	Quality score
1	English (en) Lean (proof assistant)		52.9186
2	Chinese (zh) Lean		43.6374
3	Japanese (ja) Lean (証明アシスタント)		40.8613
4	Korean (ko) Lean		37.6596
5	German (de) Lean (Beweisassistent)		33.7663
6	Persian (fa) لین (دستیار اثبات)		27.1992
7	Spanish (es) Lean		26.725
8	Russian (ru) Lean		25.6903
9	Ukrainian (uk) Lean		24.7899
10	French (fr) Lean (assistant de preuve)		14.9046

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The following table shows the most popular language versions of the article.

The most popular language versions of the article "Lean (proof assistant)" in all the time

#	Language	Popularity award	Relative popularity
1	English (en) Lean (proof assistant)		447 227
2	Spanish (es) Lean		44 860
3	Japanese (ja) Lean (証明アシスタント)		34 449
4	Russian (ru) Lean		19 910
5	Chinese (zh) Lean		15 208
6	French (fr) Lean (assistant de preuve)		14 777
7	German (de) Lean (Beweisassistent)		12 891
8	Portuguese (pt) Lean (linguagem de programação)		1 394
9	Korean (ko) Lean		1 044
10	Ukrainian (uk) Lean		931

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The following table shows the language versions of the article with the highest popularity in the last month.

The most popular language versions of the article "Lean (proof assistant)" in June 2026

#	Language	Popularity award	Relative popularity
1	English (en) Lean (proof assistant)		12 614
2	Japanese (ja) Lean (証明アシスタント)		1 744
3	Chinese (zh) Lean		821
4	French (fr) Lean (assistant de preuve)		631
5	German (de) Lean (Beweisassistent)		569
6	Russian (ru) Lean		550
7	Spanish (es) Lean		200
8	Portuguese (pt) Lean (linguagem de programação)		124
9	Korean (ko) Lean		65
10	Ukrainian (uk) Lean		29

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The following table shows the language versions of the article with the highest Authors’ Interest.

Language versions of the article "Lean (proof assistant)" with the highest Authors Interest (number of authors). Only registered Wikipedia users were taken into account.

#	Language	AI award	Relative AI
1	English (en) Lean (proof assistant)		82
2	German (de) Lean (Beweisassistent)		16
3	French (fr) Lean (assistant de preuve)		14
4	Japanese (ja) Lean (証明アシスタント)		13
5	Russian (ru) Lean		9
6	Persian (fa) لین (دستیار اثبات)		5
7	Dutch (nl) Lean (bewijsassistent)		5
8	Vietnamese (vi) Lean (trợ lý chứng minh)		5
9	Portuguese (pt) Lean (linguagem de programação)		4
10	Spanish (es) Lean		3

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The following table shows the language versions of the article with the highest Authors’ Interest in the last month.

Language versions of the article "Lean (proof assistant)" with the highest AI in June 2026

#	Language	AI award	Relative AI
1	English (en) Lean (proof assistant)		3
2	Japanese (ja) Lean (証明アシスタント)		2
3	Korean (ko) Lean		1
4	Portuguese (pt) Lean (linguagem de programação)		1
5	Czech (cs) Lean (programovací jazyk)		0
6	German (de) Lean (Beweisassistent)		0
7	Spanish (es) Lean		0
8	Persian (fa) لین (دستیار اثبات)		0
9	French (fr) Lean (assistant de preuve)		0
10	Dutch (nl) Lean (bewijsassistent)		0

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The following table shows the language versions of the article with the highest number of citations.

Language versions of the article "Lean (proof assistant)" with the highest Citation Index (CI)

#	Language	CI award	Relative CI
1	English (en) Lean (proof assistant)		360
2	Russian (ru) Lean		79
3	Chinese (zh) Lean		38
4	Japanese (ja) Lean (証明アシスタント)		12
5	French (fr) Lean (assistant de preuve)		10
6	German (de) Lean (Beweisassistent)		6
7	Czech (cs) Lean (programovací jazyk)		5
8	Spanish (es) Lean		5
9	Persian (fa) لین (دستیار اثبات)		3
10	Korean (ko) Lean		3

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#	Language	Value
cs	Czech Lean (programovací jazyk)
de	German Lean (Beweisassistent)
en	English Lean (proof assistant)
es	Spanish Lean
fa	Persian لین (دستیار اثبات)
fr	French Lean (assistant de preuve)
ja	Japanese Lean (証明アシスタント)
ko	Korean Lean
nl	Dutch Lean (bewijsassistent)
pt	Portuguese Lean (linguagem de programação)
ru	Russian Lean
uk	Ukrainian Lean
vi	Vietnamese Lean (trợ lý chứng minh)
zh	Chinese Lean

Best Rank

English: #72307 04.2026

Global: #88378 04.2026

Best Rank

English: #18192 10.2023

Global: #28783 06.2024

On 1 July 2026 in multilingual Wikipedia, Internet users most often read articles on the following topics: 2026 FIFA World Cup, Kylian Mbappé, Erling Haaland, Democratic Republic of the Congo, FIFA World Cup, Harry Kane, Romelu Lukaku, Senegal, Michael Olise, Sadio Mané.

In English Wikipedia the most popular articles on that day were: 2026 FIFA World Cup, Harry Kane, Julián Quiñones, List of FIFA World Cup top goalscorers, Kylian Mbappé, Democratic Republic of the Congo, Erling Haaland, DR Congo national football team, Melat Kiros, FIFA World Cup.

The WikiRank project is intended for automatic relative evaluation of the articles in the various language versions of Wikipedia. At the moment the service allows to compare over 50 million Wikipedia articles in 55 languages. Quality scores of articles are based on Wikipedia dumps from July, 2026. When calculating current popularity and AI of articles data from June 2026 was taken into account. For historical values of popularity and AI WikiRank used data from 2001 to 2026... More information