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Flagsmith Experiments

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

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Flagsmith now runs A/B tests on the flags you already use. Pick a flag and a metric, and get a Bayesian read on which variant wins. Use our managed warehouse or bring your own ClickHouse or Databricks. Free and open source, self-hosted or cloud.

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PH · launched Oct 21, 2026 · 105 upvotes (top 1%)

Similar launches

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Could you build this?

Partial A/B testing on feature flags, a Bayesian results view, and a basic UI are vibe-codeable. Matching the warehouse-scale data integrations (ClickHouse, Databricks) and a statistically sound experimentation engine is harder.

What it would actually take: Start from an open-source feature-flag service with an SDK and evaluation API, then add exposure and metric event logging. The Bayesian analysis itself is a well-documented model that a competent engineer can implement. The hard parts are reliable high-volume event ingestion and warehouse connectors, which need data-engineering experience and infrastructure to run at scale.

Competitors

Other products that read as similar to this one : 32 launches clear the similarity bar, closest 8 shown.

Attention rank: #2 of 33 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).

Launched 285 days after the earliest competitor.

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