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.
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](./CONTRIBUTING.md#how-to-run-the-project).
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)
The above sections show you how to get up and running quickly and easily. When you're ready to start configuring and customizing Unleash for your own environment, check out the documentation for [getting started with self-managed deployments](https://docs.getunleash.io/deploy/getting_started), [Unleash configuration options](https://docs.getunleash.io/deploy/configuring_unleash), or [running Unleash locally via docker](https://docs.getunleash.io/user_guide/quickstart#i-want-to-run-unleash-locally).
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)
💬 [Join Unleash on Slack](https://slack.unleash.run) if you want ask open questions about Unleash, feature toggling or discuss these topics in general.
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)
- [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
- 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):
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).
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 the [Unleash migration guide](https://docs.getunleash.io/deploy/migration_guide)!
- [_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
