ScanPilot captures documents with the camera, straightens the page, reads type, sender, and date on the device, and saves PDF or PNG files into a folder you choose.
There is no account. Scanning and OCR stay on your iPhone.
Support
For questions or problems with ScanPilot, open an issue on GitHub:
github.com/Waidara/scanpilot/issues
Optional: 3D-printed phone stand
Optional: 3D-Druck Handyhalter
A 3D-printed phone stand keeps a constant camera distance for scanning, so framing stays consistent from page to page.
Free model on MakerWorld: ScanPilot Document Scanner Phone Stand