[](https://github.com/Unleash/unleash/actions/workflows/build.yaml)
Unleash is an open source feature management solution. It improves the workflow of your development team and leads to quicker software delivery. Unleash increases efficiency and gives teams *full control* of how and when they enable new functionality for end users. Unleash lets teams ship code to production in *smaller* releases *whenever* they want.
Feature toggles make it easy to test how your code works with real production data without the fear that you'll accidentally break your users' experience. It also helps your team work on multiple features in parallel without each maintaining an separate feature branch.
Unleash is the largest open source solution for feature flagging on GitHub. There's 12 official client and server SDKs and 10+ community SDKs available; you can even make your own if you want to. You can use Unleash with any language and any framework.
Checking the state of a feature toggle 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 toggle is available. Here's how it might look in Java:
If you don't want to run Unleash locally, we also provide easy deployment setups for Heroku and Digital Ocean:
[](https://www.heroku.com/deploy/?template=https://github.com/Unleash/unleash) [](https://cloud.digitalocean.com/apps/new?repo=https://github.com/Unleash/unleash/tree/main&refcode=0e1d75187044)
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.
[](https://slack.unleash.run)
💬  if you want ask open questions about Unleash, feature toggling or discuss these topics in general.
💻 [Create a GitHub issue](https://github.com/Unleash/unleash/issues/new) if you have found a bug or have ideas on how to improve Unleash.
📚 [Visit the documentation](https://docs.getunleash.io/) for more in-depth descriptions, how-to guides, and more.
Building Unleash is a collaborative effort, and we owe a lot of gratitude to many smart and talented individuals.
Building it together with 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 out [the CONTRIBUTING.md file](./CONTRIBUTING.md) for contribution guidelines and the [Unleash developer guide](./website/docs/contributing/developer-guide.md) for tips on environment setup, running the tests, and running Unleash from source.
- Get an easy overview of all feature toggles across all your environments, applications and services
- Use included [activation strategies](https://docs.getunleash.io/user_guide/activation_strategy) for most common use cases, or use a [custom activation strategy](https://docs.getunleash.io/advanced/custom_activation_strategy) to support any need you might have
- Organise feature toggles by [feature toggle tags](https://docs.getunleash.io/advanced/tags)
- Targeted releases: release features to specific [users](https://docs.getunleash.io/user_guide/activation_strategy#userids), [IPs](https://docs.getunleash.io/user_guide/activation_strategy#ips), or [hostnames](https://docs.getunleash.io/user_guide/activation_strategy#hostnames)
- Out-of-the-box integrations with popular tools ([Slack](https://docs.getunleash.io/addons/slack), [Microsoft Teams](https://docs.getunleash.io/addons/teams), [Datadog](https://docs.getunleash.io/addons/datadog)) + integrate with anything with [webhooks](https://docs.getunleash.io/addons/webhook)
- [Dashboard for managing technical debt](https://docs.getunleash.io/user_guide/technical_debt) and [stale toggles](https://docs.getunleash.io/user_guide/technical_debt#stale-and-potentially-stale-toggles)
- API-first: *everything* can be automated. No exceptions.
- [12 official client SDKs](https://docs.getunleash.io/sdks#official-sdks), and ten [community-contributed client SDKs](https://docs.getunleash.io/sdks#community-sdks)
- Run it via Docker with the [official Docker image](https://hub.docker.com/r/unleashorg/unleash-server) or as a pure Node.js application
### Security & performance
- Privacy by design (GDPR and Schrems II). End-user data never leaves your application.
- Enforce [OWASP's secure headers](https://owasp.org/www-project-secure-headers/) via the strict HTTPS-only mode
- Flexible hosting options: host it on premise or in the cloud (*any* cloud)
- Scale [the Unleash Proxy](https://docs.getunleash.io/sdks/unleash-proxy) independently of the Unleash server to support any number of front-end clients without overloading your Unleash instance
### Looking for more features?
If you're looking for one of the following features, please take a look at our [Pro and Enterprise plans](https://www.getunleash.io/plans):
- [role-based access control (RBAC)](https://docs.getunleash.io/user_guide/rbac)
The front-end SDKs connects via the [Unleash Proxy](https://docs.getunleash.io/sdks/unleash-proxy) in order to ensure privacy, scalability and security.
If none of the official SDKs fit your need, there's also a number of [community-developed SDKs](https://docs.getunleash.io/sdks#community-sdks) where you might find an implementation for your preferred language (such as [Elixir](https://gitlab.com/afontaine/unleash_ex), [Dart](https://pub.dev/packages/unleash), [Clojure](https://github.com/AppsFlyer/unleash-client-clojure), and more).
- [*Feature toggles — Why and how to add to your software* — freeCodeCamp (YouTube)](https://www.youtube.com/watch?v=-yHZ9uLVSp4&t=0s)
- [*Feature flags with Unleash* — The Code Kitchen (podcast)](https://share.fireside.fm/episode/zD-4e4KI+Pr379KBv)
- [*Feature Flags og Unleash med Fredrik Oseberg* — Utviklerpodden (podcast; Norwegian)](https://pod.space/utviklerpodden/feature-flags-og-unleash-med-fredrik-oseberg)
- [*Designing the Rust Unleash API client* — Medium](https://medium.com/cognite/designing-the-rust-unleash-api-client-6809c95aa568)
- [*FeatureToggle* by Martin Fowler](http://martinfowler.com/bliki/FeatureToggle.html)
- [*Feature toggling transient errors in load tests* — nrkbeta](https://nrkbeta.no/2021/08/23/feature-toggling-transient-errors-in-load-tests/)
- [*An Interview with Ivar of Unleash* — Console](https://console.substack.com/p/console-42)
- [*Unleash your features gradually*](http://ivarconr.github.io/feature-toggles-presentation/sch-dev-lunch-2017/#1 " "), slideshow/presentation by Ivar, the creator of Unleash
