What’s in the MetaMask iOS app?

MetaMask is one of the most popular wallet in Ethereum blockchain ecosystem. Let’s look at what frameworks are inside MetaMask iOS app v5.2.0:

➜  MetaMask.app ls -1 Frameworks/
Branch.framework
Lottie.framework
Mixpanel.framework
OpenSSL.framework
libswiftCore.dylib
libswiftCoreFoundation.dylib
libswiftCoreGraphics.dylib
libswiftCoreImage.dylib
libswiftDarwin.dylib
libswiftDispatch.dylib
libswiftFoundation.dylib
libswiftMetal.dylib
libswiftObjectiveC.dylib
libswiftQuartzCore.dylib
libswiftUIKit.dylib
libswiftos.dylib

Branch

The Branch React Native SDK for deep linking and attribution. Branch helps mobile apps grow with deep links / deeplinks that power paid acquisition and re-engagement campaigns, referral programs, content sharing, deep linked emails, smart banners, custom user onboarding, and more.

https://github.com/BranchMetrics/react-native-branch-deep-linking-attribution

MetaMask uses universal links under domain metamask.app.link

Lottie

An iOS library to natively render After Effects vector animations

https://github.com/airbnb/lottie-ios

Mixpanel

Official iOS (Objective-C) Tracking Library for Mixpanel Analytics

https://github.com/mixpanel/mixpanel-iphone

OpenSSL

TLS/SSL and crypto library

https://github.com/openssl/openssl

The rest libswift* exist for supporting iOS version earlier than 12.2 (currently supporting iOS 11 or later).

MetaMask is developed with React Native:

➜  MetaMask.app ls *.jsbundle
main.jsbundle

So it was not the whole story. There’s MetaMask/metamask-mobile on the Github. Third-party libraries below:

• package.json: in JavaScript
• .gitmodules: from git submodule
• Podfile.lock: from iOS CocoaPods
• build.gradle: for Android app