Best TLA+ Alternatives in 2026
Updated
20 apps from formal verification tools ranked against TLA+ on the same published basis.
- 1TLA+ vs Z3
- 2TLA+ vs PVS
- 3TLA+ vs Rocq
- 4TLA+ vs Alloy Analyzer
- 5TLA+ vs CBMC
- 6TLA+ vs Isabelle
- 7TLA+ vs SPIN
- 8TLA+ vs UPPAAL
- 9TLA+ vs ACL2
- 10TLA+ vs Dafny
- 11TLA+ vs Frama-C
- 12TLA+ vs Boogie
- 13TLA+ vs CPAchecker
- 14TLA+ vs Viper
- 15TLA+ vs Apalache
- 16TLA+ vs HOL Light
- 17TLA+ vs HOL4
- 18TLA+ vs K Framework
- 19TLA+ vs Lean
- 20TLA+ vs NuSMV
TLA+ alternatives compared
| # | App | Score | Free plan | From | Runs on |
|---|---|---|---|---|---|
| 1 | Z3 | 7.8 | Free plan | Free | Android, API, Linux, Mac, self-hosted, Web, Windows |
| 2 | PVS | 6.4 | Free plan | Free | Linux, Mac, Windows |
| 3 | Rocq | 6.4 | Free plan | Free | Browser, Linux, Mac, Web, Windows |
| 4 | Alloy Analyzer | 6.3 | Free plan | Free | API, Linux, Mac, Windows |
| 5 | CBMC | 6.3 | Free plan | Free | Linux, Mac, self-hosted, Windows |
| 6 | Isabelle | 6.3 | Free plan | Free | Linux, Mac, self-hosted, Windows |
| 7 | SPIN | 6.3 | Free plan | Free | Linux, Mac, Windows |
| 8 | UPPAAL | 6.3 | Free plan | Free | Linux, Mac, Windows |
| 9 | ACL2 | 5.8 | No | — | Linux, Mac, self-hosted, Windows |
| 10 | Dafny | 5.8 | No | — | Linux, Mac, self-hosted, Windows |
| 11 | Frama-C | 5.8 | No | — | Linux, Mac, Windows |
| 12 | Boogie | 5.6 | No | — | — |
| 13 | CPAchecker | 5.4 | No | — | Windows, Mac, Linux |
| 14 | Viper | 5.4 | No | — | Windows, Mac, Linux |
| 15 | Apalache | 5.3 | No | — | — |
| 16 | HOL Light | 5.3 | No | — | Web, Windows, Mac, Linux |
| 17 | HOL4 | 5.3 | No | — | Windows, Linux |
| 18 | K Framework | 5.3 | No | — | Linux, Mac |
| 19 | Lean | 5.3 | No | — | Web, Windows, Mac, Linux |
| 20 | NuSMV | 5.3 | No | — | Windows, Mac, Linux |
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Questions about TLA+ alternatives
What is the best alternative to TLA+?
Z3, number 1 in formal verification tools with a score of 7.8 out of 10. The others here: PVS, Rocq, Alloy Analyzer and 16 more.
What is the best free alternative to TLA+?
Z3 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 mobile-first: a phone app alongside the web or desktop product, a free tier and the depth of its documentation.