How to request third-party captions in FaceTime on iPhone and iPad
During a FaceTime call, you can request captions from a third-party app.
Make sure your device is updated to the latest version of iOS or iPadOS.
During a FaceTime call, tap the participant's name at the top of your FaceTime call screen.
Tap Invite with FaceTime Link to send the link to a captioner.

Choose how to send the link, then accept the captioner's request to join.

On your FaceTime call screen, tap , then tap Live Captions.
Learn more
Third-party captioning is also available during a FaceTime call on macOS Golden Gate 27.2 and later, tvOS 27.2 and later, and visionOS 27.2 and later. Third-party captioning services might require a separate subscription or account. Check with your service provider for details regarding data privacy and usage.
FaceTime links aren't supported in China mainland. Creating a link to a FaceTime call isn't supported on iPhone models purchased in China mainland.