As a hobbyist musican, I use voice memos on iOS. Once I have an idea I’ve developed on whatever guitar I happen to be playing, I can just whip it out and record

As a hobbyist musican, I use voice memos on iOS. Once I have an idea I’ve developed on whatever guitar I happen to be playing, I can just whip it out and record a new memo. I also use it for recording story ideas, practice speeches, etc. Since it’s shared accross devices, I can review my ideas later on my macbook and even import them to GarageBand or Logic. The iOS notes app is also very good because it’s shared across devices in the same way. I an also an app developer and often have creative ideas, in which case the notes app is a perfect solution. If you don’t have Apple devices, I am sure you can use similar Android apps.