The iPhone captures the day.
The Mac keeps the library.
Nothing in between.
Both come with every Founder Edition.

It records continuously through the wired microphone, cuts at natural pauses, and discards silence. There is no interface to attend to during the day. The phone stays in your pocket.
Its whole job is to be trustworthy without being looked at. A recording cannot be silently lost, and a failure says what happened.

In the evening, the phone hands the day over a direct device-to-device link. You compare six digits on two screens. The Mac resolves who spoke and writes a page per person, every fact linked to the moment it was said.
When it is not sure who spoke, it asks you instead of guessing. Your answer makes recognition better next time.
Not a web page. Run it fully offline. Watch it in Activity Monitor or Little Snitch and see for yourself that nothing leaves.
No sign-up, no cloud, no sync. The library lives on your disk and nowhere else.
An iPhone and a Mac. Both apps come with the Founder Edition; neither is sold separately yet.