VeriFast vs Viper
| VeriFast | Viper | |
|---|---|---|
| Free plan | Yes | |
| Free trial | No | |
| Paid from | Free | |
| Platforms | extension, Linux, macOS, Windows | extension, Linux, macOS, Web, Windows |
| Verification method | symbolic | hybrid |
| Supported formalisms | contracts | contracts |
| Input languages | C, Rust, Java | Viper language; Go, Python, and Rust via front-end tools |
| Deployment | self-hosted | self-hosted |
| Free plan | Yes | |
| Counterexamples | Yes |
Listed together in Best Formal Verification Tools