PromptPex vs Vellum
| PromptPex | Vellum | |
|---|---|---|
| Free plan | No | Yes |
| Free trial | No | No |
| Paid from | — | $30/mo |
| Open source | No | No |
| Platforms | Linux, macOS, self-hosted, Web, Windows | Android, extension, iOS, macOS, self-hosted, Web, Windows |
| Model support | multiple | — |
| Optimization mode | automated | — |
| Prompt variables | Yes | — |
| Prompt testing | Yes | — |
| API access | Yes | Yes |
| Free plan | — | Yes |
| Paid from | — | 30 /mo |
Both are listed in Best AI Prompt Generators. On Specifiction, Vellum scores higher on our published basis.