Best OpenJML Alternatives in 2026
Updated
20 platforms from formal verification tools ranked against OpenJML on the same published basis.
- 1OpenJML vs Alloy Analyzer
- 2OpenJML vs Z3
- 3OpenJML vs PVS
- 4OpenJML vs Rocq
- 5OpenJML vs CBMC
- 6OpenJML vs Isabelle
- 7OpenJML vs SPIN
- 8OpenJML vs UPPAAL
- 9OpenJML vs ACL2
- 10OpenJML vs Frama-C
- 11OpenJML vs CPAchecker
- 12OpenJML vs Viper
- 13OpenJML vs Apalache
- 14OpenJML vs Dafny
- 15OpenJML vs HOL Light
- 16OpenJML vs HOL4
- 17OpenJML vs K Framework
- 18OpenJML vs Lean
- 19OpenJML vs NuSMV
- 21OpenJML vs PRISM
OpenJML 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 | PVS | 6.0 | Free plan | Free | Linux, Mac, Windows |
| 4 | Rocq | 6.0 | Free plan | Free | Browser, Linux, Mac, Web, Windows |
| 5 | CBMC | 5.9 | Free plan | Free | Linux, Mac, self-hosted, Windows |
| 6 | Isabelle | 5.9 | Free plan | Free | Linux, Mac, self-hosted, Windows |
| 7 | SPIN | 5.9 | Free plan | Free | Linux, Mac, Windows |
| 8 | UPPAAL | 5.9 | 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 | 5.2 | No | — | Windows, Mac, Linux |
| 12 | Viper | 5.2 | No | — | Windows, Mac, Linux |
| 13 | Apalache | 5.1 | No | — | — |
| 14 | Dafny | 5.1 | No | — | Windows, Mac, Linux |
| 15 | HOL Light | 5.1 | No | — | Web, Windows, Mac, Linux |
| 16 | HOL4 | 5.1 | No | — | Windows, Linux |
| 17 | K Framework | 5.1 | No | — | Linux, Mac |
| 18 | Lean | 5.1 | No | — | Web, Windows, Mac, Linux |
| 19 | NuSMV | 5.1 | No | — | Windows, Mac, Linux |
| 21 | PRISM | 5.1 | No | — | Windows, Mac, Linux |
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Questions about OpenJML alternatives
What is the best alternative to OpenJML?
Alloy Analyzer, number 1 in formal verification tools with a score of 7.3 out of 10. The others here: Z3, PVS, Rocq and 16 more.
What is the best free alternative to OpenJML?
Alloy Analyzer 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, 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.