Best HOL Light Alternatives in 2026
Updated
20 tools from formal verification tools ranked against HOL Light on the same published basis.
- 1HOL Light vs PVS
- 2HOL Light vs Rocq
- 3HOL Light vs Z3
- 4HOL Light vs Alloy Analyzer
- 5HOL Light vs UPPAAL
- 6HOL Light vs CBMC
- 7HOL Light vs Isabelle
- 8HOL Light vs SPIN
- 9HOL Light vs ACL2
- 10HOL Light vs Frama-C
- 11HOL Light vs Dafny
- 12HOL Light vs Lean
- 13HOL Light vs CPAchecker
- 15HOL Light vs Viper
- 16HOL Light vs cvc5
- 17HOL Light vs NuSMV
- 18HOL Light vs PRISM
- 19HOL Light vs Stainless
- 20HOL Light vs Boogie
- 21HOL Light vs OpenJML
HOL Light alternatives compared
| # | Tool | Score | Free plan | From | Runs on |
|---|---|---|---|---|---|
| 1 | PVS | 7.5 | Free plan | Free | Linux, Mac, Windows |
| 2 | Rocq | 7.5 | Free plan | Free | Browser, Linux, Mac, Web, Windows |
| 3 | Z3 | 7.4 | Free plan | Free | Android, API, Linux, Mac, self-hosted, Web, Windows |
| 4 | Alloy Analyzer | 7.2 | Free plan | Free | API, Linux, Mac, Windows |
| 5 | UPPAAL | 7.2 | Free plan | Free | Linux, Mac, Windows |
| 6 | CBMC | 7.1 | Free plan | Free | Linux, Mac, self-hosted, Windows |
| 7 | Isabelle | 7.1 | Free plan | Free | Linux, Mac, self-hosted, Windows |
| 8 | SPIN | 7.1 | Free plan | Free | Linux, Mac, Windows |
| 9 | ACL2 | 7.0 | No | — | Linux, Mac, self-hosted, Windows |
| 10 | Frama-C | 6.9 | No | — | Linux, Mac, Windows |
| 11 | Dafny | 6.8 | No | — | Linux, Mac, self-hosted, Windows |
| 12 | Lean | 6.4 | No | — | Web, Windows, Mac, Linux |
| 13 | CPAchecker | 6.3 | No | — | Windows, Mac, Linux |
| 15 | Viper | 6.3 | No | — | Windows, Mac, Linux |
| 16 | cvc5 | 6.2 | No | — | Web, Windows, Mac, Linux |
| 17 | NuSMV | 6.2 | No | — | Windows, Mac, Linux |
| 18 | PRISM | 6.2 | No | — | Windows, Mac, Linux |
| 19 | Stainless | 6.2 | No | — | Windows, Mac, Linux |
| 20 | Boogie | 6.1 | No | — | — |
| 21 | OpenJML | 6.1 | No | — | Windows, Mac, Linux |
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Questions about HOL Light alternatives
What is the best alternative to HOL Light?
PVS, number 1 in formal verification tools with a score of 7.5 out of 10. The others here: Rocq, Z3, Alloy Analyzer and 16 more.
What is the best free alternative to HOL Light?
PVS 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, the fullest spec sheet first: how deeply the product is documented, the platforms it runs on, a free tier or trial to test it, and its standing.