Best Stainless Alternatives in 2026
Updated
20 platforms from formal verification tools ranked against Stainless on the same published basis.
- 1Stainless vs PVS
- 2Stainless vs Lean
- 3Stainless vs Rocq
- 4Stainless vs UPPAAL
- 5Stainless vs Alloy Analyzer
- 6Stainless vs HOL4
- 7Stainless vs NuSMV
- 8Stainless vs Z3
- 9Stainless vs CBMC
- 10Stainless vs CPAchecker
- 11Stainless vs Isabelle
- 12Stainless vs PRISM
- 13Stainless vs SPIN
- 14Stainless vs HOL Light
- 15Stainless vs ACL2
- 16Stainless vs K Framework
- 17Stainless vs Viper
- 18Stainless vs Dafny
- 19Stainless vs Frama-C
- 21Stainless vs Ultimate Automizer
Stainless alternatives compared
| # | Platform | Score | Free plan | From | Runs on |
|---|---|---|---|---|---|
| 1 | PVS | 7.4 | Free plan | Free | Linux, Mac, Windows |
| 2 | Lean | 7.2 | Free plan | Free | Linux, Mac, Web, Windows |
| 3 | Rocq | 7.2 | Free plan | Free | Browser, Linux, Mac, Web, Windows |
| 4 | UPPAAL | 7.2 | Free plan | Free | Linux, Mac, Windows |
| 5 | Alloy Analyzer | 7.1 | Free plan | Free | API, Linux, Mac, Windows |
| 6 | HOL4 | 7.1 | Free plan | Free | Linux, Mac, self-hosted, Windows |
| 7 | NuSMV | 7.1 | Free plan | Free | Linux, Mac, Windows |
| 8 | Z3 | 7.1 | Free plan | Free | Android, API, Linux, Mac, self-hosted, Web, Windows |
| 9 | CBMC | 6.9 | Free plan | Free | Linux, Mac, self-hosted, Windows |
| 10 | CPAchecker | 6.9 | Free plan | Free | Linux, Mac, self-hosted, Windows |
| 11 | Isabelle | 6.9 | Free plan | Free | Linux, Mac, self-hosted, Windows |
| 12 | PRISM | 6.9 | Free plan | Free | Linux, Mac, Windows |
| 13 | SPIN | 6.9 | Free plan | Free | Linux, Mac, Windows |
| 14 | HOL Light | 6.7 | No | — | Linux, Mac, self-hosted, Web, Windows |
| 15 | ACL2 | 6.6 | No | — | Linux, Mac, self-hosted, Windows |
| 16 | K Framework | 6.6 | No | — | API, Linux, Mac, self-hosted |
| 17 | Viper | 6.6 | No | — | Browser, Linux, Mac, Web, Windows |
| 18 | Dafny | 6.4 | No | — | Linux, Mac, self-hosted, Windows |
| 19 | Frama-C | 6.4 | No | — | Linux, Mac, Windows |
| 21 | Ultimate Automizer | 6.3 | No | — | Linux, Web, Windows |
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Questions about Stainless alternatives
What is the best alternative to Stainless?
PVS, number 1 in formal verification tools with a score of 7.4 out of 10. The others here: Lean, Rocq, UPPAAL and 16 more.
What is the best free alternative to Stainless?
PVS is the best-ranked alternative with a free plan. 13 of the 20 alternatives here publish a free plan on their own pricing pages.
How are these alternatives ranked?
Ranked on how quickly a newcomer can get going: documentation depth, a free tier or trial, and the platforms it runs on.