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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.

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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
https://mintcdn.com/second-0659a37d/Jga8RruMCrHYBFjK/images/flutter-logo.svg?fit=max&auto=format&n=Jga8RruMCrHYBFjK&q=85&s=bee498642147e00f2206a49634670ca0

Flutter

Cross-platform mobile apps with Dart

Swift

Native iOS apps
https://mintcdn.com/second-0659a37d/IZIYL7kfKRS394NE/images/kotlin-logo.svg?fit=max&auto=format&n=IZIYL7kfKRS394NE&q=85&s=245b783dc45398d84ab7541d4afdeeda

Kotlin

Native Android apps
https://mintcdn.com/second-0659a37d/b5Qbo7s1piKFAfPk/images/wasm-logo.svg?fit=max&auto=format&n=b5Qbo7s1piKFAfPk&q=85&s=e9d6cf011b69fbdc4e8758ac0e1a9141

Web

Browser apps in JavaScript via WebAssembly
https://mintcdn.com/second-0659a37d/Jga8RruMCrHYBFjK/images/go-logo.svg?fit=max&auto=format&n=Jga8RruMCrHYBFjK&q=85&s=b4540176ae0d16a8df1ba3998d222ec2

Go

Native Go bindings

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See it in action

Built with Bark

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

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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.
Restoring a wallet requires both the user’s mnemonic and a current backup of its data, so make sure your app makes continuous backups of wallet VTXO data.