Thirteen of my apps are live on the App Store right now. All of them built solo, most of them in evenings and on weekends. Some are free, some are paid - the store page for each one shows the current price in your region.
iPhone
Zuckoff - reads the Bluetooth advertisements camera glasses broadcast (Ray-Ban Meta, Oakley Meta, Snap Spectacles) and tells you when a lens is in the room. https://apps.apple.com/app/id6795234035
TickLens - tick activity month by month for your region, which species you are likely to meet, and which diseases they carry. https://apps.apple.com/app/id6767943853
ClearEther - passively reports the ambient radio activity around you, using only the sensors already in your device. https://apps.apple.com/app/id6767580051
DualBlur - records your front and back cameras at the same time into a single video: you on one side, what you are looking at on the other. https://apps.apple.com/app/id6767943871
LoveClock - counts every day you have been together, with a glowing ring on your Home Screen. https://apps.apple.com/app/id6779314680
VaxKeeper - a vaccination record for the whole family, so nobody misses a dose. https://apps.apple.com/app/id6776013712
Mac
Peeking Pete - watches for someone reading your screen over your shoulder, using the front camera and on-device face detection. Nothing leaves the Mac. https://apps.apple.com/app/id6762534402
Hear - a volume limiter that caps output so loud audio cannot quietly wreck your hearing. https://apps.apple.com/app/id1496553269
Hide Desktop Icons - one menu bar click hides every icon, folder and file on your desktop. https://apps.apple.com/app/id1665396330
Polish apps
krew.info - live blood stock at the Polish regional blood centres (RCKiK), plus a donor diary. https://apps.apple.com/app/id6767565502
Schrony OLiOC - a map of public shelters in Poland, built from the official open data on protective structures. https://apps.apple.com/app/id6766316218
SortujTo - type an item, get the right waste bin for Warsaw. https://apps.apple.com/app/id1521805540
Anonimowe Wyznanie - a native offline reader for anonimowe.pl. No ads, no account. https://apps.apple.com/app/id1268533656
All of them in one place: https://apps.apple.com/developer/pawel-szydlowski/id1223387615
More is in the pipeline - a few are sitting in review right now. If any of these were useful to you, a tip here helps cover the developer fee and the servers.