# Fastlane — Automate Building and Releasing iOS and Android Apps

> Fastlane is an open-source platform that simplifies iOS and Android deployment. It handles code signing, screenshots, beta distribution, and App Store releases from a single command.

## Install

Save in your project root:

# Fastlane — Automate Building and Releasing iOS and Android Apps

## Quick Use
```bash
# Install via RubyGems
gem install fastlane

# Or via Homebrew
brew install fastlane

# Initialize in your project directory
cd my-app && fastlane init

# Run a lane
fastlane beta
```

## Introduction
Fastlane is an open-source build automation tool for iOS and Android apps. It was created to eliminate the tedious, error-prone manual steps of building, signing, and releasing mobile applications. Originally a solo project by Felix Krause, it was acquired by Google and is now part of the broader mobile tooling ecosystem.

## What Fastlane Does
- Automates code signing and provisioning profile management with match and cert
- Captures localized screenshots across all device sizes using snapshot
- Uploads builds to TestFlight, Google Play, and Firebase App Distribution
- Manages metadata and App Store listings from version-controlled text files
- Integrates with CI services like GitHub Actions, CircleCI, and Jenkins

## Architecture Overview
Fastlane is a Ruby-based CLI that orchestrates a chain of actions defined in a Fastfile. Each action wraps Apple or Google tooling (xcodebuild, gradle, altool) behind a declarative Ruby DSL. Plugins extend the core with community-built actions. The tool runs entirely on your local machine or CI runner and communicates with Apple and Google APIs via their official protocols.

## Self-Hosting & Configuration
- Install Ruby 2.7+ and run `gem install fastlane` or use Bundler for version pinning
- Define lanes in `./fastlane/Fastfile` using the built-in DSL
- Store code signing certificates in a private Git repo via `fastlane match`
- Set API keys and credentials through environment variables or the Appfile
- Use `.env` files per environment (`.env.staging`, `.env.production`) for lane-specific config

## Key Features
- Handles the entire release pipeline from build to App Store submission
- Over 400 built-in actions and 1,000+ community plugins
- match provides team-wide code signing without manual certificate juggling
- scan runs tests and generates formatted reports
- Works on macOS (iOS) and Linux/macOS (Android)

## Comparison with Similar Tools
- **Xcode Cloud** — Apple-native CI but limited to the Apple ecosystem and no Android support
- **Bitrise** — cloud-hosted mobile CI with a GUI but vendor lock-in and paid tiers
- **GitHub Actions** — flexible CI but requires manual scripting of signing and upload steps
- **Gradle Play Publisher** — Android-only plugin for Google Play uploads
- **App Center** — Microsoft service for distribution and analytics but being retired

## FAQ
**Q: Does Fastlane work on Linux?**
A: Android lanes work on Linux. iOS lanes require macOS because they depend on Xcode tooling.

**Q: Is Fastlane still maintained after the Google acquisition?**
A: Yes. Fastlane is actively maintained as an open-source project with regular releases and community contributions.

**Q: Can I use Fastlane with Flutter or React Native?**
A: Yes. Fastlane handles the native build and release steps regardless of the cross-platform framework used above it.

**Q: How does match handle code signing?**
A: match stores encrypted signing certificates and profiles in a private Git repo or cloud storage, ensuring every team member and CI machine uses identical credentials.

## Sources
- https://github.com/fastlane/fastlane
- https://docs.fastlane.tools/

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Source: https://tokrepo.com/en/workflows/asset-f4e27875
Author: AI Open Source