Apache-2.0 · self-hostable

Open core.
Closed loop.

The flag server, the SDKs and the rollback engine are open source. Run it on your own metal, or let us run it for you.

$ docker run -p 8080:8080 rheostat/server

rheostat / rheostatRuntime control for AI-built software★ 18.4kstars⑂ 1.2kforks◉ 412contributorsLanguagesGo 62%TypeScript 28%Python 10%a3f9c21rollback: honour judge thresholds2 h

412 people
wrote this.

Half of last year’s releases started as a community pull request. Good first issues are labelled and mentored.

Good first issues

+ 388 more on GitHub

The roadmap is public.
Vote on it.

Open the board

Shipped3

Judge-aware rollbacksAgents 412 votes
Go zero-alloc evalSDK 298 votes
Parquet exportData 187 votes

In progress3

Kubernetes operatorInfra 366 votes
Rust SDK 1.0SDK 241 votes
Policy dry-run UIUI 158 votes

Next3

Edge worker runtimeInfra 509 votes
Multi-armed banditsExperiments 322 votes
Terraform importInfra 144 votes

Same engine.
Your choice of who runs it.

Self-hosted

Free forever

Docker, Helm or a single binary
Postgres or SQLite
All SDKs and the rollback engine
Community support

Self-host guide

Rheostat Cloud

From $0 · pay per evaluation

Global edge evaluation under 20 ms
Managed upgrades and backups
SSO, audit export, 99.99% SLA
Support from the maintainers

Start on Cloud

Discord
9,800: members, 40 maintainers online most days
Office hours
Thu 17:00: UTC, every week, recorded and posted
Good first issues
64: open and mentored right now

Built by the people who use it.

“I sent a pull request for the Rust SDK on a Sunday. It was reviewed by Monday and released on Wednesday.”

Kenji WatanabeContributor, now Staff Engineer

“We run the self-hosted edition on our own cluster. Same features, our own rules, zero licence emails.”

Rafael CostaPlatform Engineer, Parallax

“The roadmap is public and the votes are real. Two of our requests shipped this year.”

Mei LinMaintainer, OpenFeature adapter

Open source questions.

Join the Discord

What licence is the core under?: Apache 2.0. Use it commercially, fork it, ship it inside your own product.
What is not open source?: The hosted control plane, SSO and the enterprise audit export. Everything that evaluates flags is open.
How do I become a maintainer?: Land five reviewed pull requests in one area and a maintainer will invite you to the team.
Is self-hosting supported?: Yes, with a Helm chart and a single binary. Community support on Discord, paid support on Enterprise.

Star it,
fork it, ship it.

Clone the repo and run your first flag locally in under five minutes.

Get the code

Open core. Closed loop.

412 people wrote this.

The roadmap is public. Vote on it.