Tweek - an open source feature management solution
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What is Tweek?

Tweek is an open source feature management solution for customizing applications and system behavior without deploying new code.

Tweek aims to be a complete open-source alternative to other industry feature/configuration/experiment management solutions such as Facebook's Gatekeeper, LinkedIn's XLNT, Dropbox's Stormcrow and other commercial SaaS solutions...


  • Feature toggles, gradual release
  • Multi-variant experiments, A/B testing
  • Built-in Editor with user friendly UI
  • Hierarchical configurations
  • Advanced targeting of users/groups
  • Dependencies between features
  • Customizable schema/domain model
  • Auditing
  • Integrated storage for saving context
  • Container friendly
  • Integrated OAuth support
  • Pluggable storage backend
  • Simple RESTful api for fetching configurations
  • Scalable

Getting Started

The easiest way to start evaluating Tweek is to run it locally on docker, make sure you have the latest docker (for windows/mac/etc..) version installed (17-06+).

Running Tweek

  • clone the repo (git clone
  • run (yarn start) - this might take a few minutes for the first time

Edit your first key

After setting up our environment, we're going to create our first key. Keys in tweek are the most basic building blocks and they represent a container for dynamic value that affect feature behaviors. Our first key, will be a key that is responsible for the color of a "sign up" button.

  • Open in browser.
  • Go to keys page.
  • Click on "Add Key"
  • Type my_app/sign_button/color
  • Set value type to String
  • Add default value "red"
  • Save changes
  • Click on "Add Rule"
  • Set Property to Country (user) and set "=" and "Canada" in the other fields
  • In Rule value set the value "blue"
  • Click "Save changes"

More on keys and paths

Querying Tweek

Use curl/postman/chrome to fire GET Request:

Using the rest api, an application can query Tweek for getting the right set of values for each specific user. More on Tweek Rest api.

Adding context data

Tweek provide's REST api for saving context data. Using the API, use curl/postman to fire POST Request:

After that, we can query Tweek API with:

More on Context.

Gradual Feature Release

Create new key in the editor "my_app/sign_button/is_enabled" with value type "boolean" and default value False.
Add new rule, remove all conditions, set the the rule value to gradual release with 50%. Try querying configuration with different users and You'll have different results.

More on how multi-variant keys work in Tweek. (link)

Deployment to production


  • Who's using Tweek?
    Tweek is been used in large scale production deployment at Soluto.
  • How do I generate ssh keys and a pfx file for use in production?
    There's a script for this purpose in utils/
  • I found a security vulnerability, should I open an issue about it?
    No. Please send an email to

Related projects

Tweek-Clients - Tweek REST clients
Tweek.JPad - Tweek's internal rules engine

Additional Resources