Your list stays in this browser on this device; the camera picture is never uploaded. No account, no ads. Export JSON before you change phones.
Aim the camera at a label, tap Capture or let auto capture read it, and every serial number lands on the next line of one list. No Lens-to-notes flipping: fix before adding, duplicates skipped, undo, export TXT, CSV or JSON, no account, offline, free.
Serialpad reads the text on a label with your camera and adds it to one list. It is not an upload-a-photo converter, not an asset database and not a barcode scanner. The reader is tuned for Latin letters and digits, so check each read before you add it.