Appium
Another cross-platform UI testing framework but with different setup and scripting approaches.
Espresso
Focused on Android UI testing with native integration, unlike Maestro's cross-platform approach.
UIAutomator
Android-specific UI testing tool, less cross-platform than Maestro.
XCTest
Apple's native testing framework for iOS/macOS, limited to Apple platforms.
Selenium
Primarily for web application testing, does not natively support mobile app UI testing.