 [](https://coveralls.io/github/Unleash/unleash?branch=master) [](https://www.heroku.com/deploy/?template=https://github.com/Unleash/unleash) [](https://www.npmjs.com/package/unleash-server) [](https://hub.docker.com/r/unleashorg/unleash-server)
[Online demo](https://app.unleash-hosted.com/demo)
## Activation strategies
It's fine to have a system for turning stuff on and off. But some times we want more granular control, we want to decide who to the toggle should be enabled for. This is where activation strategies comes in to the picture. Activation strategies take arbitrary config and allows us to enable a toggle in various ways.
Common activation strategies includes:
- Active For users with a specified userId
- GradualRollout to X-percent of our users
- Active for our beta users
- Active only for application instances running on host x.
Read more about [activation strategies in our docs](https://docs.getunleash.io/docs/user_guide/activation_strategy).
## The Client API
The [client SDKs](https://docs.getunleash.io/sdks) provides a simple abstraction making it easy to check feature toggles in your application. The code snippet below shows how you would use `Unleash` in Java.
```java
if (unleash.isEnabled("AwesomeFeature")) {
//do some magic
} else {
//do old boring stuff
}
```
# Running Unleash
The are numbers of ways you can run Unleash.
## 1. Run it yourself (on prem, self hosted)
Unleash is open source and you are free to run your own instance. The [Getting started guide](https://docs.getunleash.io/docs/deploy/getting_started) goes through all the options on how to run Unleash.
## 2. Unleash as a Service
After numerous request we have created a separate company, Unleash-hosted, which offer Unleash as a Service. Unleash-hosted allows you to focus on you core business and have someone else taking care of hosting and maintaining Unleash.
Go to [getunleash.io](https://www.getunleash.io/plans) to learn more about this offering and start using Unleash today. This service also includes official support.
# Contribute to Unleash
Unleash has been built with the help of many smart individuals. This ensures that we build a product that solves real problem for people. If you want to contribute to this project you are encouraged to send issue request, or provide pull-requests. Please read the [CONTRIBUTING.md](./CONTRIBUTING.md) to learn more on how you can contribute.
# Help
We know that learning a new tool can be hard and time consuming. We have a growing community which loves to help out. Please don't hesitate about reaching out to get help.
- [Join Unleash on Slack](https://join.slack.com/t/unleash-community/shared_invite/enQtNjUxMjU2MDc0MTAxLTJjYmViYjkwYmE0ODVlNmY1YjcwZGRmZWU5MTU1YTQ1Nzg5ZWQ2YzBlY2U1MjlmZDg5ZDRmZTMzNmQ5YmEyOGE) if you want ask open questions about Unleash, feature toggling or discuss these topics in general.
- [Create a issue request](https://github.com/Unleash/unleash/issues/new) if you have found a bug or have ideas on how to improve Unleash.
# In the media
- [Utviklerpodden, 1 - Feature Flags og Unleash med Fredrik Oseberg](https://pod.space/utviklerpodden/feature-flags-og-unleash-med-fredrik-oseberg) (Norwegian)
- [Node Weekly issue 380](https://nodeweekly.com/issues/380)
- [Console 42 - The open-source newsletter](https://console.substack.com/p/console-42)
- [This Week in Rust 340](https://this-week-in-rust.org/blog/2020/05/27/this-week-in-rust-340/)
- [Unleash-hosted - Unleash as a Service](https://www.unleash-hosted.com)
- [Medium blog](https://medium.com/unleash-hosted)
- [Blog: Unleash your features gradually!](http://bytes.schibsted.com/unleash-features-gradually/)
- [Presentation: Unleash your features gradually!](http://ivarconr.github.io/feature-toggles-presentation/sch-dev-lunch-2017/#1)
- http://martinfowler.com/bliki/FeatureToggle.html