APKUpdater is an open source tool that simplifies the process of finding updates for your installed apps.

It will provide similar functionality to an app store, making it a very useful app for those who want to run Android without Google Play.
It has been rewritten from scratch with modern technologies to make it easier to maintain.
Features
Update Sources: Find updates from APKMirror, Aptoide, F-Droid, Google Play.
Search Sources: Find new apps to install from APKMirror, Aptoide, F-Droid, Google Play.
Schedule background update checks and receive a notification when updates are found.
Supports Android 4.0.3 to Android 10.
Android TV support.
Modern Material Design 2 with multiple theme support.
Direct install of updates for sources that support it.
Root install of apps.
App ignore list. Filter updates by architecture. Filter experimental apps. Filter apps by API level.