Feature Management Platform / Feature Flags for Large Enterprise

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What is Unleash?

Unleash is a powerful open-source solution for feature management. It streamlines your development workflow, accelerates software delivery, and empowers teams to control how and when they roll out new features to end users. With Unleash, you can deploy code to production in smaller, more manageable releases at your own pace.

Feature flags in Unleash let you test your code with real production data, reducing the risk of negatively impacting your users' experience. It also enables your team to work on multiple features simultaneously without the need for separate feature branches.

Unleash is the most popular open-source solution for feature flagging on GitHub. It supports 15 official client and server SDKs and over 15 community SDKs. You can even create your own SDK if you wish. Unleash is compatible with any language and framework.

Get started with Unleash

Set up Unleash

To get started with Unleash, you can either explore Unleash Enterprise with a free trial or get started locally with our open-source solution.

Unleash Enterprise

To start with Unleash Enterprise, request a free trial. This gives you access to a hosted instance with unlimited projects and environments and features such as role-based access control, change requests, single sign-on, and SCIM for automatic user provisioning.

Unleash Open Source

To set up Unleash locally, you'll need git and docker installed on your machine.

Execute the following commands:

git clone [email protected]:Unleash/unleash.git
cd unleash
docker compose up -d

Then point your browser to localhost:4242 and log in using:

• username: admin
• password: unleash4all

If you'd rather run the source code in this repo directly via Node.js, see the step-by-step instructions to get up and running in the contributing guide.

Connect your SDK

Find your preferred SDK in our list of official SDKs and import it into your project. Follow the setup guides for your specific SDK.

If you use the docker compose file from the previous step, here's the configuration details you'll need to get going:

• For frontend SDKs, use:
  • URL: http://localhost:4242/api/frontend/
  • clientKey: default:development.unleash-insecure-frontend-api-token
• For backend SDKs, use:
  • Unleash API URL: http://localhost:4242/api/
  • API token: default:development.unleash-insecure-api-token

If you use a different setup, your configuration details will most likely also be different.

Check a feature flag

Checking the state of a feature flag in your code is easy! The syntax will vary depending on your language, but all you need is a simple function call to check whether a flag is available. Here's how it might look in Java:

if (unleash.isEnabled("AwesomeFeature")) {
  // do new, flashy thing
} else {
  // do old, boring stuff
}

Try Unleash in the cloud

Want to explore Unleash without setting it up locally? Here are two easy ways to see it in action.

Live demo

Open a running Unleash environment in your browser with no signup or setup required. This shared demo instance includes the core functionality so you can quickly get a feel for how Unleash works.

→ Launch the live demo

Free Enterprise trial

Get your own dedicated instance with a free 14-day cloud trial. This includes the full Unleash Enterprise feature set; ideal when evaluating Unleash for production use.

→ Start your free trial

Deploying to a production server

To self-host Unleash in a production environment, you need to deploy it to a persistent server.

We provide guides for deploying to services like Heroku and DigitalOcean:

For more advanced configurations options, check out our documentation on:

• Getting started with self-hosting
• Unleash configuration options

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