SatsPrice

This app fetches the price of Bitcoin relative to common fiat currencies from multiple sources, and converts inputted amounts between Sats, BTC, and the selected fiat currency.

satsprice.app Website

Download and Install

Supported Platforms

iOS 16.0+ • macOS 13.0+ • Android 7.0+ • Web (any modern browser)

Screenshots

Android

iPhone

iPad

macOS

Kotlin Multiplatform

This is a Kotlin Multiplatform project targeting Android, iOS, macOS, Web, and Desktop (JVM).

• /shared contains almost the entire app — UI (built with Compose Multiplatform), view models, data sources, and domain logic. commonMain holds code shared by every target, alongside platform-specific source sets: androidMain, jvmMain (Desktop), appleMain (iOS and macOS), and webMain (JS and Wasm).

• /androidApp, /desktopApp, and /webApp are thin launcher shells around shared's Compose UI.

• /iosApp is a native SwiftUI app (shared across iOS and macOS), not Compose — it talks to shared through a hand-written bridge rather than rendering Compose directly.

Running the apps

Use the run configurations provided by the run widget in your IDE's toolbar. You can also use these commands and options:

• Android app: ./gradlew :androidApp:assembleDebug
• Desktop app:
  • Hot reload: ./gradlew :desktopApp:hotRun --auto
  • Standard run: ./gradlew :desktopApp:run
• Web app (Compose Multiplatform UI, Skia-rendered - what's deployed to production):
  • Wasm target (faster, modern browsers): ./gradlew :webApp:wasmJsBrowserDevelopmentRun
  • JS target (slower, supports older browsers): ./gradlew :webApp:jsBrowserDevelopmentRun
• Web app, DOM alternative (Compose HTML UI, renders real DOM instead of Skia/canvas - not what's deployed to production): ./gradlew :webHtmlApp:jsBrowserDevelopmentRun
• iOS app: open the /iosApp directory in Xcode and run it from there.
• Website with the web app built and served at /app/ (the webHtmlApp DOM build, not the one production actually deploys): ./website/serve-local.sh (serves at http://localhost:8000 by default; pass a port number to override)

Running tests

Use the run button in your IDE's editor gutter, or run tests using Gradle tasks:

• Android tests: ./gradlew :shared:testAndroidHostTest
• Desktop tests: ./gradlew :shared:jvmTest
• Web tests:
  • Wasm target: ./gradlew :shared:wasmJsTest
  • JS target: ./gradlew :shared:jsTest
• iOS tests: ./gradlew :shared:iosSimulatorArm64Test

Attribution

This project uses Kotlin Multiplatform, Compose Multiplatform, and Kotlin/Wasm, along with the following libraries:

• Ktor for networking
• SQLDelight for local persistence
• moko-resources for multiplatform string/resource handling
• kotlinx.coroutines, kotlinx.serialization, and kotlinx.datetime
• kotlin-wrappers for browser/JS interop on the Web target
• kotlin-multiplatform-bignum for arbitrary-precision arithmetic

The Bitcoin Calculator icon was created by Icon home and licensed as free for personal and commercial use with attribution.

The following free APIs are used:

• Coinbase
  • Get Exchange Rates
  • Get Spot Price
• CoinGecko
  • Coin Price by IDs