I'm looking for a good audio recorder for iPhone/iOS that can record audio and render it as MP3 off-the-shelf.
Besides MP3 functionality, it's a big plus if it can share the files fast with few finger presses, to places like Slack, iCloud, Dropbox and Email.
NB: Audio recording apps that offer WAV audio could also be an alternative, although I prefer MP3 for the compression. NB2: M4A won't play in Slack channels, so therefore Apple's Voice Memos and so forth are excluded.