Experiment Lab
Before/after experiments: change content, re-measure, and test the delta for significance.
How this engine reports
- Measured evidence — labelled on every number, never dressed up as more certain than it is.
- Works with pasted answers — no API keys required.
- Reads your archived measurement runs.
- Every rate ships with its sample size and a 95% confidence interval; results below n=3 are flagged low-confidence.