InfiniTime is described as 'Open source firmware for the PineTime smartwatch. It is written in modern C++ and based on FreeRTOS' and is an app. There are more than 10 alternatives to InfiniTime for a variety of platforms, including Linux, iPhone, Android, iPad and Web-based apps. The best InfiniTime alternative is AsteroidOS, which is both free and Open Source. Other great apps like InfiniTime are Fitbit, watchOS, Wear OS and Amazfish.
Use the Apple Watch app to pair and sync your Apple Watch with your iPhone. Customize your watch faces and app notifications, choose and arrange the apps in your Dock, select photos and music to sync, and more.
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Watch is an app to pair Apple Watches, while InfiniTime is a firmware for PineTime watches and has nothing to do with pairing.