Best Lean Alternatives in 2026
Updated
20 apps from formal verification tools ranked against Lean on the same published basis.
- 1Lean vs Rocq
- 2Lean vs Z3
- 3Lean vs PVS
- 4Lean vs Alloy Analyzer
- 5Lean vs CBMC
- 6Lean vs Isabelle
- 7Lean vs SPIN
- 8Lean vs UPPAAL
- 9Lean vs ACL2
- 10Lean vs Frama-C
- 11Lean vs CPAchecker
- 12Lean vs cvc5
- 13Lean vs Dafny
- 14Lean vs HOL Light
- 16Lean vs NuSMV
- 17Lean vs PRISM
- 18Lean vs Stainless
- 19Lean vs Viper
- 20Lean vs Agda
- 21Lean vs F*
Lean alternatives compared
| # | App | Score | Free plan | From | Runs on |
|---|---|---|---|---|---|
| 1 | Rocq | 6.7 | Free plan | Free | Browser, Linux, Mac, Web, Windows |
| 2 | Z3 | 6.7 | Free plan | Free | Android, API, Linux, Mac, self-hosted, Web, Windows |
| 3 | PVS | 6.6 | Free plan | Free | Linux, Mac, Windows |
| 4 | Alloy Analyzer | 6.5 | Free plan | Free | API, Linux, Mac, Windows |
| 5 | CBMC | 6.5 | Free plan | Free | Linux, Mac, self-hosted, Windows |
| 6 | Isabelle | 6.5 | Free plan | Free | Linux, Mac, self-hosted, Windows |
| 7 | SPIN | 6.5 | Free plan | Free | Linux, Mac, Windows |
| 8 | UPPAAL | 6.5 | Free plan | Free | Linux, Mac, Windows |
| 9 | ACL2 | 5.6 | No | — | Linux, Mac, self-hosted, Windows |
| 10 | Frama-C | 5.6 | No | — | Linux, Mac, Windows |
| 11 | CPAchecker | 5.4 | No | — | Windows, Mac, Linux |
| 12 | cvc5 | 5.4 | No | — | Web, Windows, Mac, Linux |
| 13 | Dafny | 5.4 | No | — | Linux, Mac, self-hosted, Windows |
| 14 | HOL Light | 5.4 | No | — | Web, Windows, Mac, Linux |
| 16 | NuSMV | 5.4 | No | — | Windows, Mac, Linux |
| 17 | PRISM | 5.4 | No | — | Windows, Mac, Linux |
| 18 | Stainless | 5.4 | No | — | Windows, Mac, Linux |
| 19 | Viper | 5.4 | No | — | Windows, Mac, Linux |
| 20 | Agda | 5.3 | No | — | Windows, Mac, Linux |
| 21 | F* | 5.3 | No | — | Windows, Linux, Mac |
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Questions about Lean alternatives
What is the best alternative to Lean?
Rocq, number 1 in formal verification tools with a score of 6.7 out of 10. The others here: Z3, PVS, Alloy Analyzer and 16 more.
What is the best free alternative to Lean?
Rocq is the best-ranked alternative with a free plan. 8 of the 20 alternatives here publish a free plan on their own pricing pages.
How are these alternatives ranked?
Ranked free-and-open first: a usable free tier and open-source code, then the platforms it runs on and its documentation.