A/B testing and feature flags you run yourself.
Experimently is an open-source experimentation platform: experiments, feature flags, targeting rules and statistics, deployed on your own infrastructure so the assignment data never leaves it.
Apache-2.0. Both build profiles are the same licence and the same price: none.
Experiments and feature flags
Sticky assignment, gradual rollouts with configurable stages, mutual-exclusion groups and a global holdout, and automated safety rollback on error-rate and latency thresholds.
Targeting that is actually expressive
20+ operators — semantic version comparison, geo-distance, time windows, JSON path and array operations — compiled and cached, with the throughput floors asserted on every local run.
Statistics beyond a p-value
Frequentist and Bayesian analysis, sequential testing with mSPRT for early stopping, CUPED variance reduction, multi-armed bandits, and dimensional breakdowns with multiple-comparison correction.
SDKs for the stack you have
JavaScript, React, React Native, Edge, Python, Go, Java, Android, iOS, Ruby, PHP, .NET, Elixir and an OpenFeature provider, all MIT-licensed. Seven of them — JS, Python, Go, Java, Android, React Native and the OpenFeature provider — are pinned to shared golden vectors so their bucketing matches the server byte for byte.
Runs on your AWS
A CDK app for ECS Fargate, Aurora PostgreSQL and ElastiCache, or a single docker compose stack on one machine. No hosted tier, so nothing to be locked into.
Open, and checkable
The whole platform is Apache-2.0 and the SDKs are MIT. The test suites, the security scans and the release pipeline are in the repository — read them rather than take our word.
Run it locally
Four containers — Postgres, Redis, the API and this dashboard — with the database created and seeded on the way up.
git clone https://github.com/getexperimently/experimently.git
cd experimently
docker compose up -d --waitThen open localhost:3000. The quick start has the default credentials and what to change before anyone else can reach it.