Skip to main content
The Bark SDK is a set of libraries for building self-custodial bitcoin wallet apps. Keys stay on the user’s device, and your app talks directly to Ark servers. Use the Bark SDK when you’re building:
  • Mobile wallet apps
  • Desktop wallet apps
  • Browser-based wallet apps
  • Wallets for custom or embedded hardware
If you’re building bitcoin applications for server infrastructure, try Barkd.

​
Pick your platform

Each guide below walks you through installing the SDK, creating a wallet, and making your first payment, then links to the full library reference. Rust is the core implementation; the others are bindings around it.

Rust ★

Core library—most complete and performant.

React Native

Cross-platform mobile apps with TypeScript.

Flutter

Cross-platform mobile apps with Dart.

Swift

Native iOS apps.

Kotlin

Native Android apps.

Web

Browser apps in JavaScript via WebAssembly.

Go

Native Go bindings.

​
See it in action

Built with Bark

Mobile wallets and integrations shipping bitcoin payments with the Bark SDK.

​
How it works

The Bark SDK uses UniFFI bindings to run the core Rust library directly in your app. Everything happens on-device:
  • Keys stay on the device: The user’s private keys are generated and stored locally.
  • Direct protocol access: Your app communicates directly with Ark servers.
  • No backend required: You don’t need to run any server infrastructure.
The user’s mnemonic alone can restore a wallet’s balance, with the Ark server’s cooperation. For a full restore that includes payment history and in-progress exits, and doesn’t depend on the server, make sure your app also makes continuous backups of the wallet database.