PromptLens
Tests AI prompt and model changes against a baseline, flags quality drops, and keeps failed examples with the release report.
Test and compare LLM prompts with confidence using an AI evaluation platform built for engineering, product, and AI teams. PromptLens helps you detect prompt regressions before deployment by comparing new prompt versions against trusted baselines, identifying quality drops, and providing evidence-backed release recommendations.
Turn Prompt Experiments Into Confident Production Releases
Compare prompt changes, model configurations, and AI outputs against a known-good baseline before they reach users.
Whether you're building AI support agents, internal copilots, customer-facing assistants, or production LLM workflows, PromptLens helps ensure every prompt update maintains quality and reliability.
Key Features
Baseline Prompt Comparison
Evaluate new prompts against previously approved versions.
Compare:
- Prompt revisions
- Model configurations
- System prompts
- Output quality
- Evaluation history
to measure the impact of every change.
AI Regression Detection
Identify quality issues before deployment.
Automatically detect:
- Performance regressions
- Failed evaluations
- Output degradation
- Prompt quality drops
- Unexpected behavior
to reduce production risk.
Pass-to-Fail Analysis
Pinpoint exactly where a candidate prompt breaks.
Review:
- Failed test cases
- Pass-to-fail transitions
- Example outputs
- Side-by-side comparisons
- Failure explanations
to speed up debugging.
LLM-Based Evaluation
Score AI responses using automated AI judges.
Evaluate:
- Response quality
- Accuracy
- Consistency
- Instruction following
- Overall performance
through configurable LLM-powered scoring.
Shareable Evaluation Reports
Collaborate with your team using detailed comparison reports.
Share reports containing:
- Prompt differences
- Score changes
- Judge feedback
- Run metadata
- Release recommendations
through a single link.
Organization-Level Controls
Manage evaluations using your organization's approved AI providers.
Support includes:
- Organization API keys
- Provider controls
- Usage tracking
- Project management
- Team collaboration
for secure production workflows.
Built for Reliable LLM Development
PromptLens is designed to help AI teams confidently evaluate prompt changes, prevent regressions, and make evidence-based release decisions before updates reach production.
Key benefits include:
- Prompt regression testing
- Baseline comparisons
- Automated AI evaluation
- Collaborative reporting
- Production-ready AI workflows
Built For
- AI Engineers
- Machine Learning Teams
- Product Teams
- Software Developers
- QA Engineers
- AI Platform Teams
Common Use Cases
- Prompt testing
- LLM regression detection
- AI quality assurance
- Prompt optimization
- Model comparison
- AI release validation
Why It Matters
Even small prompt changes can significantly affect the quality of AI applications, making it difficult to know whether a new version is truly better or introduces hidden regressions. PromptLens solves this by comparing candidate prompts against trusted baselines, automatically identifying quality drops, highlighting failed examples, and generating detailed evaluation reports. With automated scoring, shareable evidence, and organization-level provider controls, teams can make informed release decisions with confidence instead of relying on manual spot checks.
Ship Better AI Prompts With Confidence
Compare prompt versions, detect regressions, review AI-generated evaluations, and make evidence-based release decisions with an LLM testing platform built for production AI workflows.
