Why Choose Instruct-Lab?

Stop guessing about your AI instructions. Get scientific, quantitative feedback to optimize your prompts and improve AI performance.

Dual-Model Evaluation

Your model executes instructions, GPT-4 evaluates effectiveness with quantitative scoring.

Quantitative Metrics

Get precise scores for coherence, task completion, instruction adherence, and efficiency.

Model-Agnostic Testing

Test across 100+ models via OpenRouter - OpenAI, Anthropic, Google, and more.

Privacy-First Design

All data stored locally in your browser. API keys encrypted, never sent to our servers.

Real-Time Testing

Test, evaluate, and iterate on your instructions in real-time with immediate feedback.

Export & Share

Export test results in multiple formats (JSON, CSV, PDF) for documentation and sharing.

Ready to optimize your AI instructions?

Start testing with your OpenRouter API key. No account creation required.

No data collection
Instant results
100+ models supported

Your Test History

Track your instruction optimization progress and compare results over time.

No tests yet

Run your first evaluation to see quantitative metrics and start optimizing your AI system instructions.

Takes 30-60 seconds • Requires OpenRouter API key

After running tests, you'll see:

Success probability scores
Token usage & costs
Performance metrics