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