fastlane is an open source build automation tool for Android and iOS for developers. It reduce your build generation time. It is a command line tool that uses Ruby, so you need Ruby on your computer. Most Macs already have Ruby installed by default.

Install fastlane

1. Open a terminal.
2. Run sudo gem install fastlane --verbose
3. If you haven’t installed the Xcode command-line tools yet, run xcode-select --install to install them
4. Now, cd into your project folder (type cd [with the space at the end] and drag your project folder into the terminal)
5. Run fastlane init to get fastlane setup.
6. Now you can able to use all the Fastlane tools:

iOS Tools

• deliver: Upload screenshots, metadata, and your app to the App Store
• snapshot: Automate taking localized screenshots of your iOS app on every device
• frameit: Quickly put your screenshots into the right device frames
• pem: Automatically generate and renew your push notification profiles
• sigh: Because you would rather spend your time building stuff than fighting provisioning
• produce: Create new iOS apps on iTunes Connect and Dev Portal using the command line
• cert: Automatically create and maintain iOS code signing certificates
• gym: Building your iOS apps has never been easier
• match: Easily sync your certificates and profiles across your team using Git
• scan: The easiest way to run tests for your iOS and Mac apps
• spaceship: Ruby library to access the Apple Dev Center and iTunes Connect

iOS TestFlight Tools

• pilot: The best way to manage your TestFlight testers and builds from your terminal
• boarding: The easiest way to invite your TestFlight beta testers

Android Tools

• supply: Upload your Android app and its metadata to Google Play
• screengrab: Automate taking localized screenshots of your Android app on every device