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 PVS
- 3Lean vs Z3
- 4Lean vs Isabelle
- 5Lean vs SPIN
- 6Lean vs UPPAAL
- 7Lean vs Alloy Analyzer
- 8Lean vs CBMC
- 9Lean vs ACL2
- 10Lean vs Dafny
- 11Lean vs Frama-C
- 12Lean vs HOL Light
- 14Lean vs CPAchecker
- 15Lean vs cvc5
- 16Lean vs NuSMV
- 17Lean vs PRISM
- 18Lean vs Stainless
- 19Lean vs Viper
- 20Lean vs Agda
- 21Lean vs Boogie
Lean alternatives compared
| # | App | Score | Free plan | From | Runs on |
|---|---|---|---|---|---|
| 1 | Rocq | 7.4 | Free plan | Free | Browser, Linux, Mac, Web, Windows |
| 2 | PVS | 7.3 | Free plan | Free | Linux, Mac, Windows |
| 3 | Z3 | 7.3 | Free plan | Free | Android, API, Linux, Mac, self-hosted, Web, Windows |
| 4 | Isabelle | 7.1 | Free plan | Free | Linux, Mac, self-hosted, Windows |
| 5 | SPIN | 7.1 | Free plan | Free | Linux, Mac, Windows |
| 6 | UPPAAL | 7.1 | Free plan | Free | Linux, Mac, Windows |
| 7 | Alloy Analyzer | 7.0 | Free plan | Free | API, Linux, Mac, Windows |
| 8 | CBMC | 7.0 | Free plan | Free | Linux, Mac, self-hosted, Windows |
| 9 | ACL2 | 6.6 | No | — | Linux, Mac, self-hosted, Windows |
| 10 | Dafny | 6.6 | No | — | Linux, Mac, self-hosted, Windows |
| 11 | Frama-C | 6.6 | No | — | Linux, Mac, Windows |
| 12 | HOL Light | 6.1 | No | — | Web, Windows, Mac, Linux |
| 14 | CPAchecker | 6.0 | No | — | Windows, Mac, Linux |
| 15 | cvc5 | 6.0 | No | — | Web, Windows, Mac, Linux |
| 16 | NuSMV | 6.0 | No | — | Windows, Mac, Linux |
| 17 | PRISM | 6.0 | No | — | Windows, Mac, Linux |
| 18 | Stainless | 6.0 | No | — | Windows, Mac, Linux |
| 19 | Viper | 6.0 | No | — | Windows, Mac, Linux |
| 20 | Agda | 5.9 | No | — | Windows, Mac, Linux |
| 21 | Boogie | 5.9 | No | — | — |
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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 7.4 out of 10. The others here: PVS, Z3, Isabelle 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 on what each maker publishes: documentation depth, a free tier and the platforms it runs on.