I'll look those up.
Here's another similar I found with both a free and a subscription version.
https://www.hooktheory.com/siteTo note: I've started typing in numbers rather than chord names in BIAB, and I have printed out the order of the 7 triads in every key MAJ-min to know how to enter them correctly. It's easier than remembering the names of the available root notes in the scale, and it transposes if need be.
I learned chords by shape and sound/color. I was writing songs with "borrowed chords", modal interchange, and even brief key changes long before I knew I was doing that. And until recently, I never once set out to write a song in a particular key, and determining what key the song I had written was in was as much a matter of guess-work as working-knowledge.
I could have wished for just that extra bit of help way back then, and I think a bit of help visible on the platform would be a good starting guide for those like me--musical, but ignorant. Cheat Sheets might not be the sexiest feature on BIAB 2019, but it might be easy to do and helpful.