It's an app that displays notes as a picture-in-picture.
Notes are always displayed on the screen even while using other apps.
All features are completely free to use.

Features:
- PiP display instantly when you create a note and tap it
- PiP is always displayed even if you move to another app
- Any number of notes
- Customize background color, text color, font, size freely
- Can be classified by folder or color
- Quick start-up, comfortable operability
- Dark mode
- All free

URL scheme:
pipnotes://