Alloy Analyzer vs HOL4
| Alloy Analyzer | HOL4 | |
|---|---|---|
| Free plan | Yes | No |
| Free trial | No | No |
| Paid from | Free | — |
| Open source | No | No |
| Platforms | api, Linux, macOS, Windows | Windows, Linux |
| Free plan | Yes | Yes |
| Verification method | model-checking | — |
| Supported formalisms | invariants | theorem-proving |
| Counterexamples | Yes | Yes |
| Input languages | Alloy language | HOL higher-order logic; Standard ML |
| Deployment | self-hosted | self-hosted |
| Proof artifacts | — | Yes |
Both are listed in Best Formal Verification Tools. On Freedom251, Alloy Analyzer scores higher on our published basis.