Best Formal Verification Tools in 2026
Updated
33 formal verification tools ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
33ranked
0free plans on this page
7 Oct 2026last checked
Formal Verification Tools, one module each. A lit port is something its maker publishes; 0 of the 8 on this page have a public API.
- 26 SeaHorn API not on recordOSS not on recordFREE not on recordDOCS 5.1
- 27 Stainless API not on recordOSS not on recordFREE not on recordDOCS 5.1
- 28 TLA+ API not on recordOSS not on recordFREE not on recordDOCS 5.1
- 29 VeriFast API not on recordOSS not on recordFREE not on recordDOCS 5.1
- 30 Why3 API not on recordOSS not on recordFREE not on recordDOCS 5.1
- 31 Agda API not on recordOSS not on recordFREE not on recordDOCS 5.0
- 32 cvc5 API not on recordOSS not on recordFREE not on recordDOCS 5.0
- 33 F* API not on recordOSS not on recordFREE not on recordDOCS 5.0
Compare all 8 in a table
| # | Platform | Score | Free plan | Free plan | Paid from | Verification method | Supported formalisms |
|---|---|---|---|---|---|---|---|
| 26 | SeaHorn | 5.1 | No | — | — | hybrid | invariants |
| 27 | Stainless | 5.1 | No | Yes | — | deductive | contracts |
| 28 | TLA+ | 5.1 | No | — | — | hybrid | invariants |
| 29 | VeriFast | 5.1 | No | — | — | symbolic | contracts |
| 30 | Why3 | 5.1 | No | — | — | deductive | contracts |
| 31 | Agda | 5.0 | No | — | — | deductive | theorem-proving |
| 32 | cvc5 | 5.0 | No | — | — | — | theorem-proving |
| 33 | F* | 5.0 | No | — | — | hybrid | theorem-proving |
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