Statsig

Statsig is a product development platform that combines feature flags, experimentation, and product analytics in a single system, so teams can ship features safely and measure their impact without stitching multiple tools together. Engineers wrap releases in feature gates and dynamic configs to roll out gradually, target segments, and instantly roll back, while product teams run A/B and multivariate experiments on those same flags to learn what actually moves metrics.

Because flagging, experimentation, and analytics share one event stream, every feature can be tied directly to its effect on the metrics that matter. Statsig includes product analytics (funnels, retention, dashboards), session replay, and advanced experimentation tools like Autotune (multi-armed bandits) and Layers to prevent conflicting tests. SDKs for a dozen-plus platforms evaluate flags locally in sub-50 milliseconds, and a warehouse-native option lets teams run experiments directly on their own data warehouse for governed, at-scale analysis.

Statsig is built for engineering and product teams that want a rigorous, data-driven release process — the same experimentation stack used by several large consumer apps, offered with a generous free tier. Pricing is usage-based: a free Developer plan includes millions of events, session replays, and unlimited seats, Pro adds higher volumes and advanced features from around $150 per month, and Enterprise is custom. It competes with Optimizely, LaunchDarkly, and product-analytics tools, differentiating by bundling the whole loop in one platform.