PromptLab gives you a testing framework for LLM prompts. Compare outputs across models, catch regressions, and ship with confidence.
You wouldn't ship code without tests. But most teams push prompt changes to production with nothing but a gut check and a prayer.
Run the same prompt against GPT-4o, Claude, Gemini, Llama, and more. See how each model handles your edge cases.
Define expected outputs. PromptLab flags when a prompt change causes unexpected behavior across your test suite.
See token usage and estimated cost for every test run. Compare cost/quality tradeoffs between models.
Every prompt change is tracked with its test results. Roll back to any previous version instantly.
Start from battle-tested templates for classification, extraction, summarization, code generation, and more.
Run prompt tests in your pipeline. Fail the build if quality drops below your threshold.
Define a test, run it, compare results. Three commands.
Don't start from scratch. Pick a template, customize it, test it.
Multi-class sentiment with confidence scores. Handles sarcasm, mixed sentiment, and multilingual input.
Pull structured data from unstructured text. Names, dates, amounts, addresses with JSON output.
Generate functions with docstrings, type hints, and test cases. Python, TypeScript, Go templates included.
Configurable length and style. Extractive, abstractive, and bullet-point formats with key-point highlighting.
Question-answering over retrieved context. Includes hallucination detection and source attribution prompts.
Agent prompts with function calling. Includes routing logic, error handling, and multi-step reasoning templates.
Free gives you a complete testing workflow. Pro adds scale and team features.
| Feature | Free | Pro ($24) |
|---|---|---|
| Multi-model testing | Yes | Yes |
| Test suite definition (YAML) | Yes | Yes |
| Regression detection | Yes | Yes |
| Cost tracking | Yes | Yes |
| Basic templates (3) | Yes | Yes |
| Version history | Up to 5 | Unlimited |
| Full template library (15+) | — | Yes |
| Parallel test execution | — | Yes |
| HTML report generation | — | Yes |
| Custom evaluation functions | — | Yes |
| CI/CD integration (GitHub Actions) | — | Yes |
| Prompt optimization suggestions | — | Yes |
| Priority support | — | Yes |