Catch prompt
regressions before
production.
Compare one prompt across models, score real test cases, and share the report before changes reach users.
Start with a demo preset, then compare flagship and lower-cost providers through your organization-approved access.
One comparison, three decisions.
Start from a preset or paste the prompt you are about to ship. PromptLens returns a report you can use to choose, block, or switch with evidence attached.
Decision ledger
Support triage prompt review
Choose the best answer
- Check
- Which model handled the prompt best?
- Evidence
- Side-by-side outputs, scores, pass/fail labels, failure reasons
- Action
- Pick the model with the strongest answer.
Block risky prompt changes
- Check
- Did the new prompt regress?
- Evidence
- Baseline comparison, failed cases, reason codes
- Action
- Hold the change before it reaches production.
Move spend down safely
- Check
- Can a cheaper model meet the same bar?
- Evidence
- Same dataset, same scorer, same pass threshold
- Action
- Switch only where quality holds.
Next step: pick, hold, or switch.
The shared report keeps the evidence attached to the decision.
Make every outcome inspectable.
A comparison only earns trust when the raw output, score, regression signal, and cost decision stay attached to the same run.
What the report carries
Side-by-side output review
Every answer stays beside the same prompt, dataset row, scorer, and run metadata.
Regression checks
Baseline comparisons show which prompt or model changes fall below the release bar.
Cost-quality tradeoffs
When a cheaper candidate clears the same threshold, the report gives you the evidence to switch.
Decision-ready links
Send one report URL to a teammate, stakeholder, or PR with the conclusion attached.
Organization model access
Team evaluations use approved provider access instead of personal scripts or hidden shared keys.
Simple, transparent pricing
Start free, prove the workflow, and upgrade when prompt review becomes part of your release process.
- 3 projects
- 50 evaluations/day
- 3 share links
- Unlimited projects
- Unlimited comparisons
- Unlimited share links
- Baseline + latest diffs
- Team-controlled provider access
- Structured output validation
Frequently asked questions
Common questions about PromptLens and how it compares to the tools you're already using.
Compare quality before production.
Catch regressions, find cheaper model paths, and share the evidence behind the decision.