Lean
6.9#1 in formal verification toolsFree planFree planWebLinuxmacOSWindows
VisitLean vs VeriFast
What both publish
| Fact | Lean | VeriFast |
|---|---|---|
| License | Lean is released under the Apache 2.0 license, which the documentation describes as allowing others to use and extend the code and mathematical libraries freely. | The source code and binaries are released under the MIT License. |
| Support | The Lean Community Zulip is described as the central hub for questions and collaboration, and Lean FRO hosts weekly technical office hours. | The maintainer and community can be reached for informal chat in the VeriFast Zulip chatroom. |
Lean plans
- Lean 4Free
VeriFast plans
- Free and open sourceFree
Pick Lean if…
Lean suits programmers, theorem provers, and mathematicians working with formalization, proof checking, or software verification. Its general coding capability and browser version may also suit users exploring Lean before choosing a local setup.
Pick VeriFast if…
It suits developers and researchers working on formal verification of C, Rust or Java programs. The VS Code extension may help users who want verification results in that editor and can install the separate tool.