Growthbook — Free Self-Hosted for Startups

Deal Highlights

Growthbook — Open-Source A/B Testing With Statistical Rigor

GrowthBook is an open-source feature flagging and experimentation platform that brings data warehouse-native A/B testing to startups. Unlike tools that require sending data to a third-party, GrowthBook analyzes experiments using data already in your Snowflake, BigQuery, Postgres, or Mixpanel — no data duplication needed.

Warehouse-Native Experiments

Most A/B testing tools require you to send event data to their servers. GrowthBook flips this — it queries your existing data warehouse to analyze experiments. Your data stays where it is. No ETL pipelines, no data duplication, no vendor lock-in.

Bayesian and Frequentist Stats

GrowthBook supports both Bayesian and Frequentist statistical engines. It calculates sample sizes, detects significance, and warns about common pitfalls like peeking at results too early. The stats engine is transparent and auditable — not a black box.

Feature Flags Included

SDK-based feature flags with targeting rules, percentage rollouts, and prerequisite flags. Run experiments by splitting traffic through flags. One platform for both feature management and experimentation.

GrowthBook vs Optimizely

Optimizely is the enterprise experimentation leader at enterprise pricing ($50K+/year). GrowthBook is open-source and self-hostable with comparable statistical rigor. For startups that cannot justify Optimizely pricing, GrowthBook is the clear alternative.

Getting Started

1. Self-host with Docker or use GrowthBook Cloud
2. Connect your data warehouse or analytics tool
3. Create your first experiment with feature flags
4. Analyze results with proper statistical methods

Pricing

Self-hosted is free with unlimited experiments. Cloud free plan for up to 3 users. Pro at $75/month adds more users and advanced features.

Who Is This Deal For?

Frequently Asked Questions

Everything you need to know about this startup deal.