A/B Test AI Prompts with Statistical Significance
Run controlled experiments on prompt variations, track performance metrics across OpenAI and Anthropic, and ship the prompt that actually wins — backed by real data.
Multi-provider
Test across OpenAI & Anthropic simultaneously
Live metrics
Latency, cost, quality scores per variant
Stats engine
p-values, confidence intervals, sample size calc
Simple Pricing
Pro
$49
/month
- ✓Unlimited A/B experiments
- ✓OpenAI + Anthropic integrations
- ✓Statistical significance reports
- ✓Sample size calculator
- ✓Export results as CSV/JSON
- ✓Priority email support
FAQ
How does the statistical significance testing work?
We use a two-proportion z-test to compare variant performance. The dashboard shows p-values, confidence intervals, and flags when results reach 95% statistical significance so you know when to call a winner.
Which LLM providers are supported?
PromptSplit integrates with OpenAI (GPT-4o, GPT-4, GPT-3.5) and Anthropic (Claude 3.5, Claude 3). You can run the same experiment across multiple providers and compare cost vs. quality trade-offs.
Can I cancel anytime?
Yes. Your subscription is month-to-month with no long-term commitment. Cancel anytime from your billing portal and you keep access until the end of your billing period.