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.

Flagsmith Experiments

Open-source A/B testing built on your feature flags

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Listed website: flagsmith.com
Directory record created: Oct 22, 2026
Last record update: Oct 22, 2026

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Overview
4 key features
3 use cases

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What is Flagsmith Experiments

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.

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 do startups need this tool?

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.