So this is an embarrassingly simple Twilio app, but since I found it useful myself and couldn't find something analogous, I figured I would share: http://lippytak.github.io/supersimplecallrecorder/

Basically we forward your call to the destination number, record it, then text you the recording URL after you hang-up.

Personally I'm using it to record user research calls but one can imagine other use-cases. There are many more obvious features/polish to add, which I'll consider if folks are interested. Let me know!