In Hedy 3.13.0, which is coming soon to iPhone with the next iOS update, your Apple Watch can start a session without the iPhone: tap Start on Watch and the session is sent to your iPhone the next time they're connected. Then you import it from the card that appears above in your session list, and Hedy transcribes it and creates the summary. The transcript and coaching tips are generated on the iPhone when you import, not on the Watch during the session.