Flagsmith Experiments adds A/B testing to the feature flags you already use in Flagsmith. Pick a flag and a metric to get a Bayesian read on which variant wins, using Flagsmith's managed warehouse or your own ClickHouse or Databricks. It is free and open source, available self-hosted or in the cloud.
Flagsmith Experiments
Open-source A/B testing built on your feature flags
Flagsmith Experiments Introduction
Key Features
- A/B testing built on existing feature flags
- Bayesian analysis of winning variants
- Bring your own ClickHouse or Databricks, or use the managed warehouse
- Open source with self-hosted or cloud deployment
Use Cases
- Testing feature variants before a full rollout
- Measuring the impact of releases with a chosen metric
- Running experiments on self-hosted infrastructure with your own data warehouse
Why Startups Use It
Startups already using Flagsmith can run statistically grounded A/B tests without adopting a separate experimentation platform, keeping tooling simple while choosing between self-hosting and a managed cloud option.
Alternative Options
LaunchDarkly, Optimizely, GrowthBook
Frequently Asked Questions
Is Flagsmith Experiments free?
Yes, it is free and open source, and can be self-hosted or run in the cloud.
Do I need a separate tool to run experiments?
No, Experiments runs A/B tests directly on the feature flags you already use in Flagsmith.
Which data warehouses does it support?
You can use Flagsmith's managed warehouse or bring your own ClickHouse or Databricks.
More About Flagsmith Experiments
PricingPaid
Listed DateOct 22, 2026
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