A/B Test AI Prompts with Automated Winner Selection
Route traffic between prompt variants, collect quality metrics, and automatically promote the best-performing prompt — no manual analysis needed.
Start for $39/moCancel anytime. No credit card required to try.
Traffic Splitting
Route requests across variants with configurable weights.
Quality Metrics
Score outputs by latency, cost, and custom eval functions.
Auto-Promotion
Winning variants go live automatically when thresholds are met.
Simple Pricing
Pro
$39
/month per workspace
- ✓ Unlimited A/B tests
- ✓ Up to 10 prompt variants per test
- ✓ API access & drop-in SDK
- ✓ Auto winner promotion
- ✓ Custom eval metrics
- ✓ Email support
FAQ
How does traffic routing work?
You define variants and assign traffic weights (e.g. 50/50 or 80/20). Our API endpoint randomly routes each request according to those weights and logs the result.
What counts as a "winning" variant?
You configure thresholds — minimum sample size, statistical confidence, and the metric to optimize (e.g. lowest latency, highest custom score). When a variant crosses all thresholds it is automatically promoted.
Can I integrate this with my existing AI pipeline?
Yes. Replace your direct LLM call with a single POST to our API endpoint. It returns the prompt output plus metadata. No SDK required — plain HTTP works.