Writing
AI rewrite that runs on your Mac.
Select any text, change its tone or tighten it, and see the before and after.
Halo is an on-device AI rewrite tool for your whole Mac. Select any text, press the rewrite shortcut, and choose a direction: tighten it, warm it up, or make it more formal. Halo shows you the before and after so nothing changes without your say-so, and it all happens on your machine.
How it works
Three ways it earns the shortcut.
Works on any selection
Highlight text in any app and rewrite it in place. There's no separate editor to paste into and no window to manage.
Your saved styles, one tap away
Save the ways you like to write, like warm and brief or professional email, and Halo offers them as chips. It even remembers the style you used last in each app.
Always your call
Halo shows the rewrite next to your original. Take it, tweak it, or leave your text as it was. Nothing is changed until you accept it.
Private by design.
Rewrites run on your Mac. The text you select is never uploaded, so even a sensitive draft stays on your machine.
FAQ
Questions, answered.
Does the rewrite happen in the cloud?
No. Rewrites run on your Mac, so your text is never sent to a server.
Can I control the tone?
Yes. Pick a direction like warmer, more formal, or shorter, or save your own writing styles and apply them with a tap.
Will it change my text automatically?
No. Halo shows the before and after and only replaces your text when you accept it.
Explore more
One companion, all of it free on your Mac.
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