For a while now I've been playing with different approaches to mobile UI test automation: plain XCUITest and Espresso/Compose, Appium, Maestro, page objects versus small DSLs, different ways of waiting and of dealing with flaky tests. Pretty quickly I ran into a boring but real problem: what do I actually run all this against?

The open-source apps I found mostly fell into two groups. Some only exist for Android, which doesn't help much when you want to compare approaches across both platforms. Others are intentionally simple: a login screen, a list, a details page.…