Works with your favorite LLM providers
A purpose-built toolkit for teams who need prompt QA they can trust.
Build test datasets with expected outputs. Run them on every prompt change to catch regressions before they ship.
Set pass/fail thresholds for your evals. Block releases that don't meet your quality bar automatically.
See exactly what changed between prompt versions. Visual diffs show where outputs broke and why.
Test the same prompt across OpenAI, Anthropic, and Google side-by-side. Find the best model for your use case.
Generate links for PRs, Slack, or stakeholder reviews. Everyone can see test results without an account.
Bring your own API keys. They're encrypted at rest, never logged, and stay under your control.
No complex configuration. No steep learning curve. Just reliable prompt QA.
Start a project and define your test scenarios. Group related prompts, models, and test cases together.
Build your eval set with FAQs, edge cases, and expected outputs. Import from JSON or create directly in the app.
Test each prompt change against your full dataset. Compare outputs side-by-side across models.
Define pass/fail thresholds. Block releases that regress below your quality bar.
Generate shareable links for code reviews. Stakeholders see results without needing an account.
Start free, upgrade when you need more.
Best for trying out PromptLens
For teams shipping LLM features
Everything you need to know about PromptLens.
Unit tests check if code runs correctly. PromptLens checks if LLM outputs are actually good. You define expected behaviors, and we evaluate whether prompt changes maintain or improve output quality across your entire test suite.
Most teams run their first evaluation within 5 minutes. Create a project, add a few test cases, and run your prompt against them. No complex configuration or infrastructure required.
Yes. PromptLens supports OpenAI, Anthropic, Google AI, and any OpenAI-compatible API. Bring your own API keys—they're encrypted and never logged.
Your API keys are encrypted at rest and never logged. We don't train on your data or store outputs longer than needed for your evaluations. You maintain full control over your prompts and test cases.
Yes. Run the same prompt and test cases across different models side-by-side. Compare GPT-4 vs Claude vs Gemini to find the best model for your specific use case.
No. PromptLens fits into your existing process. Generate shareable report links for PRs, Slack, or stakeholder reviews. No one needs an account to view results.
Run your first evaluation in under 5 minutes. Catch regressions before they reach production.
No credit card required • Set up in 5 minutes