Best Formal Verification Tools in 2026
Updated
33ranked
2free plans on this page
9 Oct 2026last checked
2 of the 8 here have a free tier you can use, 0 have open-source code on record, and 0 have full bars: free, open, on most of your devices and documented.
| # | App | Signal | Free tier | Open code | Devices | From | Score |
|---|---|---|---|---|---|---|---|
| 26 | OpenJMLWindows · Mac · Linux · API · Extension | Two bars | — | 3 of 6 | Free | 5.3 | |
| 27 | SeaHornMac · Linux | No signal | — | — | 2 of 6 | — | 5.3 |
| 28 | TLA+Windows · Mac · Linux · Extension | Two bars | — | 3 of 6 | Free | 5.3 | |
| 29 | VeriFastWindows · Mac · Linux | One bar | — | — | 3 of 6 | — | 5.3 |
| 30 | Why3Web · Windows · Linux · Self-hosted | One bar | — | — | 3 of 6 | — | 5.3 |
| 31 | ApalacheNo platforms listed | No signal | — | — | 0 of 6 | — | 5.1 |
| 32 | RomeoNo platforms listed | No signal | — | — | 0 of 6 | — | 5.1 |
| 33 | Satisfiability.jlNo platforms listed | No signal | — | — | 0 of 6 | — | 5.1 |
Compare all 8 in a table
| # | App | Score | Free plan | From | Free plan | Paid from | Verification method | Supported formalisms |
|---|---|---|---|---|---|---|---|---|
| 26 | OpenJML | 5.3 | Free plan | Free | — | — | deductive | contracts |
| 27 | SeaHorn | 5.3 | No | — | — | — | hybrid | invariants |
| 28 | TLA+ | 5.3 | Free plan | Free | — | — | hybrid | invariants |
| 29 | VeriFast | 5.3 | No | — | — | — | symbolic | contracts |
| 30 | Why3 | 5.3 | No | — | — | — | deductive | contracts |
| 31 | Apalache | 5.1 | No | — | — | — | symbolic | invariants |
| 32 | Romeo | 5.1 | No | — | Yes | — | model-checking | temporal-logic |
| 33 | Satisfiability.jl | 5.1 | No | — | Yes | — | symbolic | theorem-proving |
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