Apalache vs Lean
| Apalache | Lean | |
|---|---|---|
| Free plan | No | Yes |
| Free trial | No | No |
| Paid from | — | Free |
| Open source | No | No |
| Platforms | — | Linux, macOS, Web, Windows |
| Verification method | symbolic | deductive |
| Supported formalisms | invariants | theorem-proving |
| Counterexamples | Yes | — |
| Input languages | TLA+, Quint | Lean 4 |
| Deployment | self-hosted | both |
| Proof artifacts | — | Yes |
Both are listed in Best Formal Verification Tools. On Specifiction, Lean scores higher on our published basis.