I’ll go first:
I have a personal photo/video app that uses B2 for storage and Vultr to host a VM (free egresss). It’s main goal is to keep archival copies that can be viewed, verified, and shared and so the server code is very lightweight: user permissions, API endpoints for thumbnails (eg /pictures/utgGhj/400x400/image.jpg), add/edit/delete endpoints, and a notification system.
The app is distributed by manually installing it (future plans to distribute via TestFlight and whatever the Android equivalent is).
The app itself is very simple: Flutter, login screen, list views that can be sorted (default to newest), and a screen for viewing an item. Share links and comments are stored in Firebase (mostly for the offline sync convenience).
Someone could probably make it in a couple weeks if they have a little backend+mobile experience.
What apps do you “cook at home”?