Lean
6.9#1 in formal verification toolsFree planFree planWebLinuxmacOSWindows
VisitLean vs Viper
What both publish
| Fact | Lean | Viper |
|---|---|---|
| Support | The Lean Community Zulip is described as the central hub for questions and collaboration, and Lean FRO hosts weekly technical office hours. | The maker directs users to the Viper Zulip channel and Stack Overflow for support. |
Lean plans
- Lean 4Free
Viper plans
No prices published.
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 Viper if…
Viper suits developers and researchers building verification tools, prototypes, or manually encoded verification problems. It is relevant when contract specifications, permission reasoning, and Go, Python, Rust, or Viper-language inputs fit the work.