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No ChatGPT account. No copy-pasting prompts. Fill in your details and get results in seconds. All tools are free — just sign in to get started.
4 tools built specifically for prompt engineers
Build an eval rubric that catches real regressions — 4-8 specific criteria measuring observable behaviors (not subjective 'quality'), with scoring approach, edge cases, and a run plan with kill criteria.
Saves ~3 hours
Generate 30-100 synthetic test cases (happy path, edge cases, adversarial) that look like real production traffic — not invented inputs that bear no resemblance to what the prompt actually sees.
Saves ~2 hours per eval batch
Audit a Claude SKILL.md or prompt artifact for frontmatter validity, injection surface, instruction contradictions, and length budget. Specific findings with severity (P0/P1/P2) and fixes.
Saves ~2 hours per skill audit
Write a regression report after a prompt or skill change — headline decision up front, per-criterion deltas with threshold checks, subgroup regression notes, and specific failure mode analysis.
Saves ~2 hours per release