I got a bit sick of not having the right supermarket loyalty card with me and getting royally screwed over at the checkout.
I made a little webpage for storing arbitrary photos against supermarket names so I could always access images of loyalty cards quickly and easily[1]. It should work even when you don't have an internet connection, and the images stay on your device - nothing is sent anywhere else.
It is a no-frills website I needed, and hopefully I will now no longer get ripped off when putting together my meal deal.
Add it to your home screen and stop getting done over for an egg sandwich 👍
[1]: Yes I know about google wallet or whatever it is but I don't use that stuff, and the instructions I saw said things like "To add your card to this app, download this other app..."