My first ever 'app' is published and live on the App Store for Apple Watch. It's a simple little thing that you open, it tells you to take a breath and then flick your wrist to see a random Buddhist phrase. Things like 'this too will pass' and along those lines. It was really just a very simple, simple way to put something together and if it could remotely be useful or worth distributing, all the better. It's free and more for the sake of having something out there like a live portfolio.
The next one is a bit more complicated. A simple iPhone app that tracks 'days since' and 'days until' an event you programme in. This exists and there are a tonne of apps on there that do this... with various customisation and add on features. The issue is... they're all free with a subscription. Personally I don't care if they let me change a background colour or whatever... I see the value in paying once, and that's it. It's not like they need to pay to run some sort of server on an ongoing basis. Mine will be bog standard... plain and a one off, £1.99 or something like that with no subscription. The use?
Well, I've quit things or stopped things in the past and found it sort of motivating to every so often go and check how long it's been... the average time between resets if I did the thing again. Handy for crushing bad habits. Then of course, counting down until things like holidays or other events - right now, paying off things, the day of being completely debt free.
Mostly about learning how these things work and the process of gradually adding small little features as time goes on. For the love of it, if I can make back the £79 a year Apple charge to be listed on there that's my only real money goal with it.