What is Cotypist?

Cotypist is a smart autocomplete tool for macOS that predicts your next words as you type in any Mac app — Mail, Slack, Notes, docs, even AI prompts. Press Tab to accept a suggestion, or keep typing and watch it update in real time. Everything runs locally on your Mac, with no cloud processing or API calls.

Who it's for

• Heavy email writers — Zip through your inbox and craft thoughtful replies in half the time.
• Non-native English speakers and dyslexic typists — Levels the playing field with inline suggestions that reduce typing effort and catch errors.
• Anyone who writes prompts for AI tools — Faster prompts for ChatGPT, Claude, and coding agents, with Cotypist helping you find the right words to prompt your other AI tools.

Key features

Real-time inline predictions

Suggestions appear directly in whatever app you're already using — no pop-ups, no separate window. Tab takes the next word; keep typing if you don't want it. The predictions update within a letter or two if you reject them.

Local-only processing

All prediction happens on your Mac's Apple Silicon chip. No data leaves your device, no prompts end up in someone else's training data. The kind of privacy you'd expect from your keyboard.

Adaptive style learning

Cotypist picks up your vocabulary, names, and phrasing patterns the more you write. It learns your campaign voice, your email style, and the way you naturally express yourself — without needing any setup or training.

Typo correction and emoji suggestions

Cotypist spots typos in the word you're typing and offers the fix inline — Tab to apply, no red squiggles. Type a colon and the right emoji appears; filter by typing a shortcode without scrolling through a picker.

What stands out

"It feels like skipping the step between thinking a word and typing it."

That's the core experience: suggestions land without perceptible delay, and you never leave your flow. Unlike chatbots that interrupt your writing with a robotic wall of text, Cotypist augments your natural typing rhythm. You start typing, the right words appear — your words, the ones you would have written anyway — and you just keep going. No more flipping to ChatGPT, prompting, waiting, and editing.

Worth checking out if…

You write a lot on Mac and want to cut your typing roughly in half without losing your voice. Cotypist is especially useful if you value privacy (no cloud, no API calls), if you write in multiple apps throughout the day, or if repetitive typing causes strain. It's free to download for Apple Silicon with a 30-day Pro trial, no credit card required.