Frama-C vs Lean
Frama-C
frama-c.com
Lean
lean-lang.orgSide by side
| Figure | Frama-C | Lean |
|---|---|---|
| Price from | — | Free |
| Free plan | — | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | — | Yes |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| Linux | Yes | Yes |
| Plans published | 0 | 1 |
| Spec score · Formal Verification Tools | 7.5 (#20) | 8.6 (#2) |
| Extensibility | The platform supports development of plug-ins that add analyses or modify existing ones. | Lean's metaprogramming capabilities let users add domain-specific notation and proof automation. |
| Maker | The platform is co-developed at CEA LIST and the Inria Saclay–Île-de-France Toccata team, in common with LRI-CNRS and Université Paris-Sud 11. | The Lean FRO says Leonardo de Moura created Lean in 2013 and that the FRO formed in July 2023 as a nonprofit under Convergent Research. |
| Platforms | The current download page provides installation instructions for Linux and macOS, and describes Windows use through WSL. | The reference lists Linux, macOS, and Windows among Lean’s supported platforms, with Tier 1 binary releases available through elan. |
| Support | The project offers technical support, training, tutorial sessions, hackathons, extensions, and customization for commercial or industrial use. | The Lean Community Zulip is described as the central hub for questions and collaboration, and Lean FRO hosts weekly technical office hours. |
Plans
In their own words
Lean
Lean is an open-source programming language and proof assistant for formalizing mathematics, verifying software, and writing general code. Its minimal trusted kernel checks proofs, and the project describes it as supporting correctness in mathematical, software, and hardware verification. Lean includes the Grind tool for automating some pattern matching, case analysis, and systems of linear inequalities; metaprogramming lets users add notation and proof automation. Projects are managed with Lake, the package manager bundled with Lean. Mathlib is a community-driven library with over a million lines spanning areas including algebra, analysis, topology, probability, and computer science. The recommended setup uses VS Code with the Lean 4 extension for syntax highlighting and code completion, while Neovim with lean.nvim is also well-supported. Lean runs on Linux, macOS, and Windows, and Lean4Web lets users run code in a browser. The software is free under the Apache 2.0 license. Learning resources include textbooks, tutorials, interactive games, documentation, and an API reference.