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