[opensourcedex]

FeatBit is a free, open source application security project written in C# and released under MIT. It has 1,954 GitHub stars, 150 forks and 26 open issues, and was last pushed 15 hours ago. On this registry it ranks #11 of 16 tracked projects in Application Security, with 5 head-to-head comparisons available. It gained 45 stars over the last 30 tracked days.

What is FeatBit?

What it is

FeatBit is an open-source feature flag management tool written in TypeScript and released under the MIT license. It lives in the continuous delivery and experimentation ecosystem, where teams use feature flags, A/B testing, entitlements, and feature toggles to control software releases. The project is a self-hostable feature flag platform, and it provides a web portal, official SDKs, and deployment material for Docker and Kubernetes.

The problem it addresses is the coupling of code deployment to feature release. Teams need to ship code safely, test behavior in production, expose features to selected users, and recover from errors without redeploying. FeatBit separates deployment from release by letting developers check flag state in application code and change rollout behavior through the platform. It supports targeted experiences, progressive rollout, and hosting the service in environments where compliance and data protection matter.

Key capabilities

  • It supports feature flags, feature toggles, feature management, entitlements, experimentation, A/B testing, and continuous delivery workflows.
  • It lets teams roll out features to a small share of users initially and expand progressively.
  • It controls who sees each feature and when they see it, supporting targeted experiences.
  • It provides SDK integration, including a C# example that checks a Boolean flag with a user context and default value.
  • It supports self-hosting through Docker Compose and Kubernetes manifest files, and references a FeatBit Agent for self-managed deployments.

Who uses it and how

  • Development teams use it to gate new algorithms or features inside application code with conditional checks.
  • Product and engineering teams use it to release features to specific target users and measure business behavior through experimentation and A/B testing.
  • Self-hosting teams use it to run a feature flag service inside their own environment with Docker or Kubernetes.

Getting started

The README shows a self-hosted start using git clone, Docker Compose, and access to a local portal, followed by connecting an official SDK and checking a feature flag in code. It also points to Docker Compose installation documentation, Kubernetes manifest files, and FeatBit Agent documentation for self-managed deployments.

When to use it — and when not to

FeatBit fits teams that want an MIT-licensed, self-hostable feature flag platform and can operate the portal, SDK connections, and deployment environment. It is less suitable for teams that want a hosted service with no infrastructure responsibility, because the default local portal, default credentials, and public access instructions show that self-hosting requires configuration and security work. The repository metadata lists 26 open issues and no contributors, so teams needing a mature community signal may want to verify the current state before adoption.

project readme (upstream, from github) — read inline

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Documentation | Community (Discord) | LinkedIn | Email

Try FeatBit Online

Try FeatBit immediately with our online demo. The video below shows you how to get started quickly.

https://github.com/featbit/featbit/assets/68597908/d836702d-6096-4025-9b9e-5128a8b52dcb

About FeatBit

FeatBit is an open-source feature flags management tool that empowers developers:

Ship Code Safely. Mitigate risks with Production Testing, roll out features to 1% of users initially then expanding progressively, and ensure instant error recovery without redeployment.

Targeted Experiences. Giving you control over who sees each feature and when they see it. Release features to specific target users, and continuously measure and improve your business.

Innovate Faster. Decouples code deployments from feature releases. Deploy at will, and release any feature immediately upon request from the boss.

Host Anywhere. FeatBit allows you to host your feature flags service wherever your business needs it, ensuring compliance and data protection.

Born for developers. Use simple if/else statements to control and release features, eliminating complex DevOps tasks. This enables developers to directly drive business value.

Get started in 3 steps

1. Start FeatBit

To self-host FeatBit with Docker, Run this script:

git clone https://github.com/featbit/featbit
cd featbit
docker compose up -d

Once all containers have started, you can access FeatBit's portal at http://localhost:8081 and log in with the default credentials:

Note By default, FeatBit's portal is only accessible from the local machine where Docker Compose is running. If you want to make it publicly accessible, refer to the FAQ for instructions.

2. Connect an 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.

You can also learn how to connect an SDK in the "Getting Started" section after logging in to the Portal for the first time.

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3. Check a feature flag

To check the state of a feature flag in your code, you just need a simple function call to verify the expected value. Here's how it might look in C#:

var user = FbUser.Builder("tester-id").Name("tester").Build();
if (featbit.BoolVariation("user-new-algorithm", user, defaultValue: false))
{
    // run new algorithm
}
else
{
    // run old algorithm
}

🙏 If you are using FeatBit, we have launched the FeatBit Usage Survey. It would be greatly appreciated and incredibly helpful if you could take the time to fill it out (5 questions).

Configure and run FeatBit anywhere

The above sections show you how to get up and running quickly and easily. When you're ready to start configuring and customizing FeatBit for your own environment, check out the Installation Documentation, K8s Manifest Files and FeatBit Agent Documentation for getting started with self-managed deployments, FeatBit configuration options, or running FeatBit locally via docker.

Documentation & Community

Official Documentation

Join our Online Discord Support & Community

Connect with FeatBit on LinkedIn

Email us at contact@featbit.co if Slack isn't your thing.

Official Website

Features

FeatBit offers a range of features including:

featbit-readme-new-2

Contribute

Building FeatBit is a collaborative effort, and we owe much gratitude to many intelligent and talented individuals.

Join Discord to get your assignment.

Contributors

We would like to express our gratitude to all the individuals who have already contributed to FeatBit!

Made with contrib.rocks.

License

FeatBit is an Open Core product. The bulk of the code is under permissive MIT license. See the LICENSE file for details.

Certain features in FeatBit are subject to licensing restrictions and require a valid license key. Check out the License Documentation for more information.

Frequently asked questions

Is FeatBit free to use?

FeatBit is open source under the MIT licence. There is no licence fee and no seat count — you can self-host it or, where the project offers one, pay a vendor for a managed version instead.

What does FeatBit do?

Open-source feature flag management for seamless deployments

What is FeatBit written in?

FeatBit is primarily written in C#. Its source is publicly available at https://github.com/featbit/featbit, and it has 1,954 GitHub stars.