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All the Confidence SDKs support the OpenFeature standard, a project from Cloud Native Computing Foundation (CNCF) that aims to standardize feature flagging. With the OpenFeature integration your application interacts with the OpenFeature API and a Provider provides the connection to Confidence. This documentation refers to the overall setup as “Confidence SDK” for simplicity.

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Server SDKs

Confidence offers Server SDKs built on an open source Confidence Resolver—a Rust-based flag resolver that can run natively or as WebAssembly. These SDKs evaluate flag rules to flag values entirely on your infrastructure. The resolver syncs flag rules and logging with the Confidence backend periodically, in the background. This enables:
  • Ultra-low latency: Flag evaluations happen locally in microseconds
  • High reliability: No network dependency at evaluation time

Go

Go OpenFeature provider

Java

Java OpenFeature provider

JavaScript/Node.js

Node.js OpenFeature provider

Next.js

Next.js with App Router

Rust

Rust OpenFeature provider

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Client SDKs

Client SDKs are a specialized form of local resolve designed for mobile and web applications. They resolve all flags once according to the evaluation context, and flag values are then read from a local cache. This approach works well when the evaluation context doesn’t change often—for example, a mobile client that sets the context on login or app start and maintains it throughout the session.

iOS (Swift)

Swift SDK for iOS

Android (Kotlin)

Kotlin SDK for Android

JavaScript (Web)

JavaScript SDK for web browsers

Flutter

Flutter SDK for cross-platform apps

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Edge Resolve

The WebAssembly based resolver is also packaged to run on edge computing platforms. This enables flag evaluation as close to your users as possible, minimizing latency for geographically distributed applications.

Cloudflare Worker

Edge resolver for Cloudflare Workers

Context

Configure evaluation context

Apply Events

Track flag assignments

Flags Introduction

Overview of feature flags