HoldoutHub

HoldoutHub is a web app (with optional SDK) that makes “always-on” holdout testing practical for teams that can’t run clean A/B tests every week. Instead of constant variant swapping, you define persistent holdout cohorts (by user, account, geo, or device) and measure long-term incremental lift across product changes, pricing tweaks, onboarding updates, and marketing campaigns. It connects to your data warehouse and event pipeline, auto-builds matched cohorts, and produces simple lift readouts with confidence intervals and guardrail metrics. It’s an AI + traditional app: AI helps detect metric drift, suggests segmentation where results are most likely to differ, and flags when holdouts are contaminated (e.g., user switching devices). This is not a replacement for Optimizely/LaunchDarkly; it’s a measurement layer for teams that already ship fast but don’t trust their attribution.