mode
two ways to see a suggestion. the difference is how much you want to choose.
chat mode (default)
you get two rows: fix, your message with the errors corrected and nothing else touched, and native, the same message rewritten the way a fluent speaker would say it.
changed words are marked in red so you can see exactly what moved. press tab to accept the highlighted row, or ↑ ↓ to move between them first.
use chat mode when you are still learning. seeing the fix next to the rewrite is where the learning happens.
flow mode
one row, the best suggestion, nothing to compare. press tab and keep typing.
use flow mode when you already write well and just want the friction gone.
proofread only, offline
two checks, both on your own machine. spelling comes back in milliseconds from the same checker every mac app uses. grammar goes to apple's on-device model about a second later, and it catches the things a spell checker cannot: wrong tense, missing articles, prepositions, word order.
neither one spends your quota, neither needs internet, and nothing is sent anywhere. grammar needs macos 26 with apple intelligence turned on. without it you still get spelling and basic agreement, and settings tells you which one you are getting.
clean draft, and you get a green tick and looks good. something off, and you get the corrected sentence to accept with tab, plus a line per problem so you learn it.
use it when you already write well and just want the confidence check before you send. switch to chat mode for the days you want the rewrite too.
the why button
in chat mode the popup has a ? that explains the fix in one line: which rule you hit, and what to do next time. it is off when you are reading replies or translations, where there is no fix to explain.
turn it off entirely in settings under features, if you want suggestions without the lesson.