leanprover/lean4
Lean 4 programming language and theorem prover
⚡ Executive Summary & Quick Facts
Authoritative Sourcelean4 is lean4 is an open-source project written in Lean: Lean 4 programming language and theorem prover..
“According to real-time open source telemetry recorded on GitHubRepo.cloud (as of November 2026), leanprover/lean4 has accumulated 9,854 GitHub stars and 1,086 forks. It is written in Lean, licensed under Apache-2.0, and ranks #1,672 globally. It is actively maintained with the latest commit recorded on Nov 3, 2026.”
| Repository | leanprover/lean4 ↗ |
|---|---|
| Primary Category | lean |
| Language & Stack | Lean |
| Software License | Apache-2.0 |
| Community Traction | ★ 9.9K stars · ⑂ 1.1K forks · #1,672 globally |
| Maintenance | ● Active (Last commit: Nov 3, 2026) · 1,910 open issues |
| Target Audience | Developers and engineering teams building with Lean, seeking reliable, tested, and actively maintained tooling for production workloads. |
🛡️ Repository Maintenance & Health Audit (2026)
Health Score: 90/100 · Grade AYes, lean4 is actively maintained. Continuous telemetry recorded the last code commit on Nov 3, 2026 (9 days ago). Supported by 9,854 stars and 1,086 community forks, this repository holds a calculated health index of 90/100, reflecting very active (commits within last 14 days) and high open issue volume (1,910 open).
Star History
Add Live Star History & Verified Badges to README.md
Keep your repository README looking professional and dynamic. As our continuous crawler records new stars, these official SVG badges update in real time with zero maintenance.
Renders your high-resolution star trajectory chart right inside your GitHub README or project docs.
[](https://githubrepo.cloud/repo/leanprover/lean4?utm_source=readme_chart)Compact badges for your README header. Real-time stars, velocity, health audit, and rank.
[](https://githubrepo.cloud/repo/leanprover/lean4?utm_source=readme_badge) [](https://githubrepo.cloud/repo/leanprover/lean4?utm_source=readme_badge) [](https://githubrepo.cloud/repo/leanprover/lean4?utm_source=readme_badge) [](https://githubrepo.cloud/repo/leanprover/lean4?utm_source=readme_badge) [](https://githubrepo.cloud/repo/leanprover/lean4?utm_source=readme_badge)Momentum
+246
STARS · LAST 30 DAYS
8
PER DAY
#1
MOST-STARRED Lean
| Window | 7 days | 30 days | 90 days |
|---|---|---|---|
| Stars gained | +0 | +246 | +720 |
| Per day | 1 | 8 | 8 |
| Forks gained | +0 | +22 | +54 |
lean4 gained 246 stars in the last 30 days, about 8 a day, and now has 9.9K. It is about 9 years old and has averaged roughly 1.1K stars a year. It ranks #1 among Lean repositories and #1,672 across all languages on GitHubRepo.
Trending Record
7
DAYS ON TRENDING
#7843
BEST RANK
Nov 3, 2026
FIRST APPEARANCE
Active
STATUS TODAY
lean4 has maintained a continuous presence across global trending indexes, peaking at #7843. Below is the 30-day activity profile:
💡 Overview
lean4 is an open-source project written in Lean: Lean 4 programming language and theorem prover.
Engineered for speed, consistency, and developer ease, it solves common hurdles in lean, lean4. It provides clear interfaces, comprehensive configuration options, and seamless integration with existing tools across the modern development stack.
⚡ Key Features
Optimized execution pipeline written in Lean for predictable speed.
Zero-friction configuration with comprehensive sensible defaults out of the box.
Cross-platform runtime support across Linux, macOS, and Windows environments.
Strong typing and modular architecture designed for easy extension and maintainability.
Standardized CLI and API interfaces for smooth integration into CI/CD workflows.
Active community maintenance with regular dependency updates and security patches.
📥 Installation
$ git clone https://github.com/leanprover/lean4.git
cd lean4⚙ System Requirements
Platforms
- • macOS
- • Linux
- • Windows
Runtime & Dependencies
Lean environment and standard tooling
Architecture
x86_64, ARM64 (Apple Silicon & Graviton)
🧠 How It Works
lean4 coordinates its core functionality through a modular Lean pipeline. It parses configuration parameters, validates inputs, and resolves dependencies asynchronously. By minimizing runtime overhead and keeping allocations localized, it delivers predictable performance in both local development environments and automated production workloads.
🎯 Production Use Cases
Production System Integration
Embed lean4 into Lean backend services to handle core application logic.
CI/CD Automated Pipelines
Run automated validation, builds, and integration suites during deployments.
Developer Tooling & Workflows
Accelerate developer onboarding with pre-configured project utilities.
Open Source Extension
Fork and customize internal modules under the repository's open Apache-2.0 license.
🚀 Getting Started
Install lean4 using your package manager: `git clone https://github.com/leanprover/lean4.git`
Initialize your project workspace or configuration file for lean4.
Import lean4 into your codebase or invoke it directly from your terminal.
Execute your test suite or run `lean4 --help` to verify successful setup.
👍 Strengths
⚠️ Considerations
⇄ Alternatives & Direct Competitors
👥 Who Should Use This
Developers and engineering teams building with Lean, seeking reliable, tested, and actively maintained tooling for production workloads.
🏆 Nearby in the Rankings
leanprover/lean4 is currently ranked #1,672 by stars across every repository tracked on GitHubRepo. These are adjacent projects:
| Rank | Repository | Language | Stars | Action |
|---|---|---|---|---|
| #1,667 | senchalabs/connect | JavaScript | ★ 9.9K | Compare ↗ |
| #1,668 | dr5hn/countries-states-cities-database | Python | ★ 9.9K | Compare ↗ |
| #1,668 | awslabs/mcp | Python | ★ 9.9K | Compare ↗ |
| #1,670 | webdriverio/webdriverio | TypeScript | ★ 9.9K | Compare ↗ |
| #1,671 | v2fly/domain-list-community | Go | ★ 9.9K | Compare ↗ |
| #1,672 | leanprover/lean4 This Project | Lean | ★ 9.9K | |
| #1,673 | MahApps/MahApps.Metro | C# | ★ 9.8K | Compare ↗ |
| #1,674 | ethereum-lists/chains | Kotlin | ★ 9.8K | Compare ↗ |
| #1,675 | bobthecow/psysh | PHP | ★ 9.8K | Compare ↗ |
| #1,676 | owasp-modsecurity/ModSecurity | C++ | ★ 9.8K | Compare ↗ |
| #1,677 | ashishb/android-security-awesome | Makefile | ★ 9.8K | Compare ↗ |
Frequently Asked Questions
What does lean4 do? +
Lean 4 programming language and theorem prover
Is lean4 actively maintained in 2026? +
Yes, lean4 is actively maintained. The latest code push was recorded on Nov 3, 2026 (9 days ago). It holds a calculated Maintenance Health Score of 90/100 (A rating) with 9,854 stars and 1,910 open issues.
What language is lean4 written in? +
The primary language is Lean. Topics include: lean, lean4.
How many stars does lean4 have? +
lean4 has 9,854 stars and 1,086 forks on GitHub.
How does lean4 rank among GitHub repositories? +
With 9,854 stars, leanprover/lean4 is ranked #1,672 globally across all repositories tracked on GitHubRepo and #1 among Lean projects.
What license is lean4 distributed under? +
The repository reports a Apache-2.0 license. Always verify the repository LICENSE file for legal terms.
