I was using Kaspersky QR Scanner, but it seems to be limited to < 1000 chars or so in the QR code, even though QR codes can hold nearly 8000 chars. I'd like a secure QR code app which can do up to the max chars. It must run on Android, but ideally would work on iPhone too.
What I mean by "secure":
I don't want the chance of the read QR code content leaving my phone. That means I expect it to be processed on my phone only, not sent to the cloud, and not stored in any remote servers. I want no chance that the writers of the app can see the contents of the QR code, as it could contain private data, encryption or authentication keys, etc.
Here is a test QR code I'd like the application to be able to open:
I generated it using this command, as I describe here: How to best create QR Codes in Linux, including Ubuntu:
cat "eRCaGuy_dotfiles/useful_scripts/git-branch_.sh" \
| qrencode -m 4 -o /tmp/qr.png && eog /tmp/qr.png &
Despite being only 2900 chars, I can't even find a QR reader that will properly read it. I need a reader that will read it.