Best Z3 Alternatives in 2026
Updated
20 platforms from formal verification tools ranked against Z3 on the same published basis.
- 1Z3 vs PVS
- 2Z3 vs Rocq
- 3Z3 vs UPPAAL
- 4Z3 vs Alloy Analyzer
- 6Z3 vs CBMC
- 7Z3 vs Isabelle
- 8Z3 vs SPIN
- 9Z3 vs ACL2
- 10Z3 vs Frama-C
- 11Z3 vs CPAchecker
- 12Z3 vs Lean
- 13Z3 vs Viper
- 14Z3 vs cvc5
- 15Z3 vs Dafny
- 16Z3 vs HOL Light
- 17Z3 vs NuSMV
- 18Z3 vs PRISM
- 19Z3 vs Stainless
- 20Z3 vs Agda
- 21Z3 vs F*
Z3 alternatives compared
| # | Platform | Score | Free plan | From | Runs on |
|---|---|---|---|---|---|
| 1 | PVS | 7.4 | Free plan | Free | Linux, Mac, Windows |
| 2 | Rocq | 7.2 | Free plan | Free | Browser, Linux, Mac, Web, Windows |
| 3 | UPPAAL | 7.2 | Free plan | Free | Linux, Mac, Windows |
| 4 | Alloy Analyzer | 7.1 | Free plan | Free | API, Linux, Mac, Windows |
| 6 | CBMC | 6.9 | Free plan | Free | Linux, Mac, self-hosted, Windows |
| 7 | Isabelle | 6.9 | Free plan | Free | Linux, Mac, self-hosted, Windows |
| 8 | SPIN | 6.9 | Free plan | Free | Linux, Mac, Windows |
| 9 | ACL2 | 6.6 | No | — | Linux, Mac, self-hosted, Windows |
| 10 | Frama-C | 6.4 | No | — | Linux, Mac, Windows |
| 11 | CPAchecker | 6.1 | No | — | Windows, Mac, Linux |
| 12 | Lean | 6.1 | No | — | Web, Windows, Mac, Linux |
| 13 | Viper | 6.1 | No | — | Windows, Mac, Linux |
| 14 | cvc5 | 6.0 | No | — | Web, Windows, Mac, Linux |
| 15 | Dafny | 6.0 | No | — | Windows, Mac, Linux |
| 16 | HOL Light | 6.0 | No | — | Web, Windows, Mac, Linux |
| 17 | NuSMV | 6.0 | No | — | Windows, Mac, Linux |
| 18 | PRISM | 6.0 | No | — | Windows, Mac, Linux |
| 19 | Stainless | 6.0 | No | — | Windows, Mac, Linux |
| 20 | Agda | 5.9 | No | — | Windows, Mac, Linux |
| 21 | F* | 5.9 | No | — | Windows, Linux, Mac |
Make your platform an alternative to Z3
See the priceThe sponsored alternative slot on this page is labelled and never changes the order above.
Questions about Z3 alternatives
What is the best alternative to Z3?
PVS, number 1 in formal verification tools with a score of 7.4 out of 10. The others here: Rocq, UPPAAL, Alloy Analyzer and 16 more.
What is the best free alternative to Z3?
PVS 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 how quickly a newcomer can get going: documentation depth, a free tier or trial, and the platforms it runs on. Paid placements never change a rank.