Best Stainless Alternatives in 2026
Updated
20 platforms from formal verification tools ranked against Stainless on the same published basis.
- 1Stainless vs Alloy Analyzer
- 2Stainless vs Z3
- 3Stainless vs HOL4
- 4Stainless vs PVS
- 5Stainless vs Rocq
- 6Stainless vs CBMC
- 7Stainless vs Isabelle
- 8Stainless vs NuSMV
- 9Stainless vs PRISM
- 10Stainless vs SPIN
- 11Stainless vs UPPAAL
- 12Stainless vs ACL2
- 13Stainless vs Dafny
- 14Stainless vs Frama-C
- 16Stainless vs Ultimate Automizer
- 17Stainless vs Boogie
- 18Stainless vs HOL Light
- 19Stainless vs CPAchecker
- 20Stainless vs Viper
- 21Stainless vs Apalache
Stainless alternatives compared
| # | Platform | Score | Free plan | From | Runs on |
|---|---|---|---|---|---|
| 1 | Alloy Analyzer | 7.3 | Free plan | Free | API, Linux, Mac, Windows |
| 2 | Z3 | 7.3 | Free plan | Free | Android, API, Linux, Mac, self-hosted, Web, Windows |
| 3 | HOL4 | 6.0 | Free plan | Free | Linux, Mac, self-hosted, Windows |
| 4 | PVS | 6.0 | Free plan | Free | Linux, Mac, Windows |
| 5 | Rocq | 6.0 | Free plan | Free | Browser, Linux, Mac, Web, Windows |
| 6 | CBMC | 5.9 | Free plan | Free | Linux, Mac, self-hosted, Windows |
| 7 | Isabelle | 5.9 | Free plan | Free | Linux, Mac, self-hosted, Windows |
| 8 | NuSMV | 5.9 | Free plan | Free | Linux, Mac, Windows |
| 9 | PRISM | 5.9 | Free plan | Free | Linux, Mac, Windows |
| 10 | SPIN | 5.9 | Free plan | Free | Linux, Mac, Windows |
| 11 | UPPAAL | 5.9 | Free plan | Free | Linux, Mac, Windows |
| 12 | ACL2 | 5.6 | No | — | Linux, Mac, self-hosted, Windows |
| 13 | Dafny | 5.6 | No | — | Linux, Mac, self-hosted, Windows |
| 14 | Frama-C | 5.6 | No | — | Linux, Mac, Windows |
| 16 | Ultimate Automizer | 5.5 | No | — | Linux, Web, Windows |
| 17 | Boogie | 5.4 | No | — | — |
| 18 | HOL Light | 5.4 | No | — | Linux, Mac, self-hosted, Web, Windows |
| 19 | CPAchecker | 5.2 | No | — | Windows, Mac, Linux |
| 20 | Viper | 5.2 | No | — | Windows, Mac, Linux |
| 21 | Apalache | 5.1 | No | — | — |
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Questions about Stainless alternatives
What is the best alternative to Stainless?
Alloy Analyzer, number 1 in formal verification tools with a score of 7.3 out of 10. The others here: Z3, HOL4, PVS and 16 more.
What is the best free alternative to Stainless?
Alloy Analyzer is the best-ranked alternative with a free plan. 11 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, open and connectable first: a public API, open-source code, the depth of its documentation and a free tier to try it on. Model lists are sorted by the figure in their title, exactly as each provider publishes it.