Open Source SDKs Built for OpenFeature

Our SDKs are well documented, open source, and built for the OpenFeature standard. Use DevCycle anywhere across your stack.

Open Source SDKs Built for Open Standards

OpenFeature-Native SDKs for Every Language

Community-backed, open-source SDKs with no vendor lock-in. Built transparently and compliant with the OpenFeature standard.

JavaScript SDK

Client-side JavaScript SDK with OpenFeature compliance](https://docs.devcycle.com/sdk/client-side-sdks/javascript/)

React SDK

React hooks and components for seamless feature flag integration](https://docs.devcycle.com/sdk/client-side-sdks/react/)

Next.js SDK

Server-side rendering and static generation support](https://docs.devcycle.com/sdk/client-side-sdks/nextjs/)

Angular SDK

TypeScript-first framework SDK for Angular applications](https://docs.devcycle.com/sdk/client-side-sdks/angular/)

React Native SDK

Cross-platform mobile development with React Native](https://docs.devcycle.com/sdk/client-side-sdks/react-native/)

Android SDK

Native Android development with Kotlin and Java support](https://docs.devcycle.com/sdk/client-side-sdks/android/)

iOS SDK

Native iOS development with Swift and Objective-C support](https://docs.devcycle.com/sdk/client-side-sdks/ios/)

Flutter SDK

Cross-platform mobile development with Dart and Flutter](https://docs.devcycle.com/sdk/client-side-sdks/flutter/)

Roku SDK

BrightScript SDK for Roku streaming applications](https://docs.devcycle.com/sdk/client-side-sdks/roku/)

Node.js SDK

Server-side JavaScript with enterprise-grade performance](https://docs.devcycle.com/sdk/server-side-sdks/node/)

NestJS SDK

Progressive Node.js framework for scalable server-side applications](https://docs.devcycle.com/sdk/server-side-sdks/nestjs/)

Go SDK

High-performance server-side SDK for Go applications](https://docs.devcycle.com/sdk/server-side-sdks/go/)

Java SDK

Enterprise Java applications with Spring Boot integration](https://docs.devcycle.com/sdk/server-side-sdks/java/)

.NET SDK

C# and .NET Core applications with ASP.NET support](https://docs.devcycle.com/sdk/server-side-sdks/dotnet/)

Python SDK

Django, Flask, and FastAPI framework integrations](https://docs.devcycle.com/sdk/server-side-sdks/python/)

Ruby SDK

Ruby on Rails and Sinatra application support](https://docs.devcycle.com/sdk/server-side-sdks/ruby/)

PHP SDK

Laravel, Symfony, and Vanilla PHP application support](https://docs.devcycle.com/sdk/server-side-sdks/php/)

Comprehensive SDK Features To Power Your Releases

DevCycle's OpenFeature-native SDKs provide enterprise-grade capabilities across all programming languages

[**Realtime Updates**

Instantly push feature flag changes to all SDKs using server-sent events without app restarts.

LEARN MORE](https://docs.devcycle.com/sdk/features/#realtime-updates)

[**SDK Bootstrapping**

Eliminate initial load delays with pre-loaded configurations for instant flag evaluations.

LEARN MORE](https://docs.devcycle.com/sdk/server-side-sdks/node/node-bootstrapping/)

[**Local & Cloud Bucketing**

Choose between lightning-fast local evaluations or edge-based cloud bucketing for advanced features like EdgeDB.

LEARN MORE](https://docs.devcycle.com/sdk/features#local-and-cloud-bucketing)

[**Custom Event Tracking**

Track user interactions and business metrics for A/B testing and feature impact analysis.

LEARN MORE](https://docs.devcycle.com/sdk/features#tracking-custom-events)

[**Intelligent Caching**

Smart caching ensures your apps work even with poor connectivity.

LEARN MORE](https://docs.devcycle.com/sdk/features#caching-of-configurations)

[**Advanced User Targeting**

Target users with custom properties, private data, and dynamic user identification.

LEARN MORE](https://docs.devcycle.com/sdk/features#identifying-a-user-or-setting-properties)

[**Custom Domains**

Reduce the impact of adblockers by being able to CNAME client side endpoints to your domain to reduce adblock risk.

LEARN MORE](https://docs.devcycle.com/sdk/features#custom-domains)

OpenFeature SDK FAQs

Everything you need to know about DevCycle's comprehensive OpenFeature SDK collection and how to implement feature flags with the OpenFeature standard.

What are OpenFeature SDKs?+
Which OpenFeature SDKs does DevCycle support?+
How do DevCycle's OpenFeature providers compare to other providers?+
Are DevCycle's OpenFeature SDKs open source?+
How do I migrate from proprietary feature flag SDKs to OpenFeature?+
What performance benefits do DevCycle's OpenFeature SDKs provide?+
Do OpenFeature SDKs support all DevCycle features?+
Can I use OpenFeature SDKs for mobile app development?+
How do OpenFeature hooks work with DevCycle SDKs?+
What is bootstrapping in OpenFeature SDKs?+
How do I implement OpenFeature SDKs in microservices?+
Do OpenFeature SDKs work with poor connectivity?+