Lightspeed Aviation's FlightLink is a free iPhone/iPad app for folks with a Zulu 2 headset that records all intercom and ATC communications as you fly. You can scroll back and replay any part of the recording, and search a library of recordings from previous days. The iPad version also has a scratchpad for writing notes.
This is a companion discussion topic for the original entry at https://www.avweb.com/air-shows-events/flightlink-records-radio-calls