I'm not working on my portfolio tracker app https://Stocketa.com anymore these days. Working with stock APIs is such a slog. Good data costs thousands per month and the other providers are bad: constant issues, have to string them together, build your own backend to manage them, etc
Will probably write more about it at some point, but until now here's my TestFlight. Play around and explore, but I probably won't keep it live much longer so I can save some money.