Best OpenJML Alternatives in 2026
Updated
20 platforms from formal verification tools ranked against OpenJML on the same published basis.
- 1OpenJML vs PVS
- 2OpenJML vs Lean
- 3OpenJML vs Rocq
- 4OpenJML vs UPPAAL
- 5OpenJML vs Alloy Analyzer
- 6OpenJML vs HOL4
- 7OpenJML vs NuSMV
- 8OpenJML vs Z3
- 9OpenJML vs CBMC
- 10OpenJML vs CPAchecker
- 11OpenJML vs Isabelle
- 12OpenJML vs PRISM
- 13OpenJML vs SPIN
- 14OpenJML vs HOL Light
- 15OpenJML vs ACL2
- 16OpenJML vs K Framework
- 17OpenJML vs Viper
- 18OpenJML vs Dafny
- 19OpenJML vs Frama-C
- 20OpenJML vs Stainless
OpenJML 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 |
| 20 | Stainless | 6.4 | No | — | Linux, Mac, Windows |
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Questions about OpenJML alternatives
What is the best alternative to OpenJML?
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 OpenJML?
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.