AOSP, the Android Open Source Project, is the open core. Nearly every Android ships from it:
Google's Pixels. Samsung's One UI. Amazon's Fire OS, which ships with zero Google apps. Xiaomi. OnePlus. LineageOS. GrapheneOS.
So what makes Android feel like Google? GMS. Google Mobile Services: the Play Store, Play Services, and the proprietary APIs underneath, push notifications, location, in-app billing. None of that lives in AOSP. It's licensed separately, and that's how Google keeps its grip.
Strip GMS out and Android still runs fine. GrapheneOS ships that way: no Google services baked in, and if you want Google apps they're sandboxed and optional. CalyxOS does it with microG. Amazon dropped GMS wholesale years ago.
Since 2025 Google develops Android in private branches and pushes source to AOSP only at release. The code is still open when it lands, but the days of watching Android get built in public are over though.
quotingReminder: AOSP exists.
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