The Carrd of apps. Super easy entry, based on Google Sheets as database. But still, with formulars and different elements you can go a long way. While you can work around more situations than you think and they have a helpful community, you might reach your limit at some point.
This is really the closest to a 2nd brain I've seen. benefit of not thinking of where to put a note is surprisingly big. thoughts digitalised and so easily connected. You literally want to use it and I have it open 24/7. Likely not fully leveraging it yet. Want: Needs an app.