Prompt Assay vs PromptLayer
| Prompt Assay | PromptLayer | |
|---|---|---|
| Free plan | No | Yes |
| Free trial | No | No |
| Paid from | — | $49/mo |
| Open source | No | No |
| Platforms | Web | api, self-hosted, Web |
| Free plan | Yes | Yes |
| Prompt versioning | Yes | Yes |
| Prompt testing | Yes | Yes |
| Prompt templates | Yes | Yes |
| Access controls | Yes | Yes |
| API or SDK access | Yes | Yes |
| Model provider support | multi-provider | provider-agnostic |
| Approval workflows | — | Yes |
Both are listed in Best Prompt Management Software. On Samsung Mobile US Press, PromptLayer scores higher on our published basis.