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Launch the live demo |Try Unleash Enterprise for free

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.

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

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 asrole-based access control,change requests,single sign-on, andSCIM for automatic user provisioning.

To set up Unleash locally, you'll needgit anddocker installed on your machine.

Execute the following commands:

git clone git@github.com:Unleash/unleash.gitcd unleashdocker compose up -d

Then point your browser tolocalhost: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 thestep-by-step instructions to get up and running in the contributing guide.

Find your preferred SDK inour 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.

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}

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

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

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

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

We know that learning a new tool can be hard and time-consuming. We have a growing community that loves to help out. Please don't hesitate to reach out for help.

💬Join Unleash on Slack if you want ask open questions about Unleash, feature toggling or discuss these topics in general.

💻Create a GitHub issue if you have found a bug or have ideas on how to improve Unleash.

📚Visit the documentation for more in-depth descriptions, how-to guides, and more.

📖 Learn more about the principles of building and scalingfeature flag solutions.

Unleash is the largestopen-source feature flag solution on GitHub. Building Unleash is a collaborative effort, and we owe a lot of gratitude to many smart and talented individuals. Building it together with the community ensures that we build a product that solves real problems for real people. We'd love to have your help too: Please feel free to open issues or provide pull requests.

Check outthe CONTRIBUTING.md file for contribution guidelines and theUnleash developer guide for tips on environment setup, running the tests, and running Unleash from source.

• Get an overview of all feature flags across all your environments, applications and services
• Targeted releases usingactivation strategies to enable and disable features for certain users or segments without having to redeploy your application.
• Canary releases / gradual rollouts
• Kill switches
• A/B testing
• 2environments
• Organize feature flags usingtags
• Out-of-the-box integrations with popular tools (Slack,Microsoft Teams,Datadog) + integrate with anything withwebhooks
• Insights for managing technical debt andstale flags
• API-first:everything can be automated. No exceptions.
• 12 official SDKs, and 10community-contributed SDKs
• Run it via Docker with theofficial Docker image or as a pure Node.js application

• Privacy by design (GDPR and Schrems II). End-user data never leaves your application.
• Audit logs
• EnforceOWASP's secure headers via the strict HTTPS-only mode
• Flexible hosting options: host it on premise or in the cloud (any cloud)
• Scale withUnleash Edge independently of the Unleash server to support any number of frontend clients without overloading your Unleash instance

If you're looking for one of the following features, please take a look at ourPro and Enterprise plans:

• role-based access control (RBAC)
• single sign-on (SSO)
• more environments
• feature flags project support
• advanced segmentation
• additional strategy constraints
• tighter security
• more hosting options (we can even host it for you!)

Read more in thesystem overview section of the Unleash documentation.

To connect your application to Unleash you'll need to use a client SDK for your programming language.

Official backend SDKs:

• Go SDK
• Java SDK
• Node.js SDK
• PHP SDK
• Python SDK
• Ruby SDK
• Rust SDK
• .NET SDK

Official frontend SDKs:

• Android Proxy SDK
• Flutter Proxy SDK
• iOS Proxy SDK
• JavaScript Proxy SDK
• React Proxy SDK
• Svelte Proxy SDK
• Vue Proxy SDK

Community SDKs:

If none of the official SDKs fit your need, there's also a number ofcommunity-developed SDKs where you might find an implementation for your preferred language (such asElixir,Dart,Clojure, and more).

Unleash is trusted by thousands of companies all over the world.

Proud Open-Source users: (send us a message if you want to add your logo here)

Unleash has evolved significantly over the past few years, and we know how hard it can be to keep software up to date. If you're using the current major version, upgrading shouldn't be an issue. If you're on a previous major version, check out theUnleash migration guide!

• The Unleash YouTube channel
• Feature toggles — Why and how to add to your software — freeCodeCamp (YouTube)
• Feature flags with Unleash — The Code Kitchen (podcast)
• Feature Flags og Unleash med Fredrik Oseberg — Utviklerpodden (podcast; Norwegian)

• The Unleash Blog
• Designing the Rust Unleash API client — Medium
• FeatureToggle by Martin Fowler
• Feature toggling transient errors in load tests — nrkbeta
• An Interview with Ivar of Unleash — Console
• Unleash your features gradually, slideshow/presentation by Ivar, the creator of Unleash