Yes, non-Vowel users can use Vowel, though they will not have access to any of the recordings, transcription, or annotations collected during the conversation. Non-Vowel users can use Vowel to participate in a remote call using Vowel or to get better quality audio from their microphone for the Vowel recording.
To include a non-Vowel user in a Vowel meeting, simply copy and paste the meeting link and share it with them. They’ll be prompted to log in using a Google account, and after accepting "terms of service" they will be able to join your meeting as a guest.
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