Not sure which SDK to use? Check out our Integration Overview documentation.
For a more detailed overview of how the client-side SDKs work, check out our announcement blog post: Client-Side SDKs for Flipt.

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Overview

Flipt provides a number of client-side SDKs to help you integrate with Flipt in your application. The SDKs are available in a number of languages:

JavaScript

Evaluate flags client-side in your Node.js or browser-based applications

React

Evaluate flags client-side in your React applications

Python

Evaluate flags client-side in your Python applications

Go

Evaluate flags client-side in your Go applications

Java

Evaluate flags client-side in your Java applications

Ruby

Evaluate flags client-side in your Ruby applications

Dart

Evaluate flags client-side in your Dart/Flutter applications

C#

Evaluate flags client-side in your C# applications

Swift

Evaluate flags client-side in your Swift applications

Android

Evaluate flags client-side in your Android applications

Request a Client

Need a client in another language? Let us know!

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Polling vs Streaming

By default, the SDKs will use a polling mechanism to sync the state of the flags with the Flipt server. You can set the polling interval using the updateInterval option in the SDK’s configuration. Note: Flipt Cloud offered streaming mode for real-time flag updates, but Flipt Cloud is shutting down on August 29, 2025. If you’re currently using Flipt Cloud, please read our blog post for guidance on migrating to self-hosted Flipt.