GEPAzilla vs PromptEval
GEPAzilla
gepazilla.com
PromptEval
prompt-eval.comSide by side
| Figure | GEPAzilla | PromptEval |
|---|---|---|
| Price from | — | $9/mo |
| Free plan | — | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| API | Yes | Yes |
| Self-hosted | Yes | — |
| Plans published | 0 | 4 |
| Spec score · AI Prompt Generators | 7.3 (#20) | 8.0 (#11) |
| Scoring | It supports combining deterministic checks with LLM judges and weighting or duplicating scorers. | It provides a reproducible 0–100 score with diagnostics across clarity, specificity, structure, and robustness. |
Plans
In their own words
PromptEval
PromptEval is a web and API SaaS platform for evaluating and optimizing large-language-model prompts. It assigns a reproducible score from 0 to 100, with diagnostics covering clarity, specificity, structure and robustness, then identifies issues, warnings, strengths and targeted fixes. A token optimizer compresses prompts while preserving intent and reports the reduction percentage. Its versioned library keeps prompt history, score changes and diffs. The A/B Playground compares two prompts across as many as seven criteria using a user-provided API key. An official GitHub Action can fail pull requests after score drops, contradictions or production regressions. Pro and Team users can serve prompts by slug through an API endpoint, with changes taking effect in about 60 seconds. Plans include a free tier, Basic at $9 a month, Pro at $19 a month, and custom-priced Team.