Best Z3 Alternatives in 2026
Updated
20 apps from formal verification tools ranked against Z3 on the same published basis.
- 1Z3 vs Rocq
- 2Z3 vs PVS
- 4Z3 vs Isabelle
- 5Z3 vs SPIN
- 6Z3 vs UPPAAL
- 7Z3 vs Alloy Analyzer
- 8Z3 vs CBMC
- 9Z3 vs ACL2
- 10Z3 vs Dafny
- 11Z3 vs Frama-C
- 12Z3 vs HOL Light
- 13Z3 vs Lean
- 14Z3 vs CPAchecker
- 15Z3 vs cvc5
- 16Z3 vs NuSMV
- 17Z3 vs PRISM
- 18Z3 vs Stainless
- 19Z3 vs Viper
- 20Z3 vs Agda
- 21Z3 vs Boogie
Z3 alternatives compared
| # | App | Score | Free plan | From | Runs on |
|---|---|---|---|---|---|
| 1 | Rocq | 7.4 | Free plan | Free | Browser, Linux, Mac, Web, Windows |
| 2 | PVS | 7.3 | Free plan | Free | Linux, Mac, Windows |
| 4 | Isabelle | 7.1 | Free plan | Free | Linux, Mac, self-hosted, Windows |
| 5 | SPIN | 7.1 | Free plan | Free | Linux, Mac, Windows |
| 6 | UPPAAL | 7.1 | Free plan | Free | Linux, Mac, Windows |
| 7 | Alloy Analyzer | 7.0 | Free plan | Free | API, Linux, Mac, Windows |
| 8 | CBMC | 7.0 | Free plan | Free | Linux, Mac, self-hosted, Windows |
| 9 | ACL2 | 6.6 | No | — | Linux, Mac, self-hosted, Windows |
| 10 | Dafny | 6.6 | No | — | Linux, Mac, self-hosted, Windows |
| 11 | Frama-C | 6.6 | No | — | Linux, Mac, Windows |
| 12 | HOL Light | 6.1 | No | — | Web, Windows, Mac, Linux |
| 13 | Lean | 6.1 | No | — | Web, Windows, Mac, Linux |
| 14 | CPAchecker | 6.0 | No | — | Windows, Mac, Linux |
| 15 | cvc5 | 6.0 | No | — | Web, Windows, Mac, Linux |
| 16 | NuSMV | 6.0 | No | — | Windows, Mac, Linux |
| 17 | PRISM | 6.0 | No | — | Windows, Mac, Linux |
| 18 | Stainless | 6.0 | No | — | Windows, Mac, Linux |
| 19 | Viper | 6.0 | No | — | Windows, Mac, Linux |
| 20 | Agda | 5.9 | No | — | Windows, Mac, Linux |
| 21 | Boogie | 5.9 | No | — | — |
Make your app an alternative to Z3
See the priceThe sponsored alternative slot on this page is labelled Sponsored.
Questions about Z3 alternatives
What is the best alternative to Z3?
Rocq, number 1 in formal verification tools with a score of 7.4 out of 10. The others here: PVS, Isabelle, SPIN and 16 more.
What is the best free alternative to Z3?
Rocq is the best-ranked alternative with a free plan. 7 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: documentation depth, a free tier and the platforms it runs on.