Cotypist is smart autocomplete for the Mac apps you already write in: Mail, Slack, Notes, docs, even AI prompts. Press Tab when a suggestion fits, or keep typing and watch it update in real time. Runs locally on your Mac. No cloud, no API calls.
Hey everyone, I'm Daniel, the developer behind Cotypist.
First, a quick thank-you to the Product Hunt team. After Cotypist launched back in May, they reached out and invited me back for a featured relaunch. I'm honestly a little stunned by that, and very grateful to be here again.
A few years ago, I noticed I'd developed a weird habit: copying conversations into Visual Studio Code, just to get GitHub Copilot's inline completions, then pasting them back into the app I should have been writing in. After enough of that, it clicked: autocomplete shouldn't live in one editor. It should work wherever you write.
So I built Cotypist. It's smart autocomplete that runs locally on your Mac (no cloud, no API calls), in basically every app you type into. Install it, give it a minute, and you're writing faster everywhere on your Mac. No long setup. Tab to accept a suggestion, keep going. Words still sound like you.
You can download Cotypist today from https://cotypist.app; there's a free 30-day trial with all the features, and there's also a free plan for casual use after that.
During early access, Cotypist has become a daily driver for founders, marketers, support folks, novelists, physicians, academics, and long-time Mac users. People who type a lot of email, Slack, and AI prompts. Plus a long tail I didn't see coming: non-native English speakers, one-handed typists, and (this still blows my mind!) not one but two Neuralink brain-implant wearers.
What still surprises me about Cotypist, even after building it, is how often it feels like it's reading your mind. Or almost like a colleague finishing your sentences.
Happy to take questions about the product, where it works (and where it doesn't), what's coming next, or anything else. I'll be here all day.
system-wide tab-insertion across Mail/Slack/Notes is two problems stacked — the AX permission tap to read context, and per-app text injection that doesn't fight the native autocomplete. the 'your voice' part is the harder one — on-device personalization (recency kNN or LoRA) carries the quality ceiling more than base model size.
Running it fully local so nothing hits the cloud is the part that sells me, autocomplete that reads my drafts shouldn't leave my Mac. Love that it works across Mail and Slack too. Congrats on the launch Daniel!
Did you ever compare Copilot's autocomplete and your own to see which one felt more like you? Curious to hear how most mainstream models compare in terms of speed, 'correctness', and any quirks they might have trying to do a similar thing. I've definitely fed Claude my slack + conversation history and told it to build a tone profile and write things like I would but it didn't really sound too much like me haha.
It's a really great app. I've been using it for a month, and now I can hardly imagine working without it.
This is one of my favorite apps because it not only helps me type, but also helps me think about what I could type next. It’s like having a personal assistant when I’m stuck for words. It’s been great to see its development over the last year. I’m not sure what else could be added to it, but I’m quite sure that the developers have some tricks up their sleeve.
@daniel_a_a I'm curious why Cotypist doesn't the Apple Neural Engine at least as an option. It's much more efficient than inference on CPU/GPU, which would significantly improve concerns about battery life. It would also eliminate the obnoxious "chirping birds" sounds from coil whine as I type (M5 Max).
Local and in my own voice is the exact reason I'd turn this on. Cloud autocomplete always felt off inside Mail and Slack. Does it learn a style per app or share one across everything?
I've been using @Cotypist since one of the earliest versions, and it’s been a game changer for me. Can you believe that the sentense you just read was written 100% by @Cotypist? ;) Using tabs to accept suggestions is so much faster. I'm addicted to it! Many many many thanks to @daniel_a_a and a lot of hopes that the product is going to grow and find more users and traction. More people should know about it!
One of my favorite products!!! Can't believe I've been working without it all this time. It's on the same level as having a voice dictation app — absolutely essential. Once you start using it, you'll never go back.
The system-wide angle is what actually makes this interesting - not just autocomplete in one app but everywhere you write. I keep context-switching between Slack, email, and docs all day and having suggestions that follow you across all of them without sending anything to the cloud is a real differentiator. Curious how it handles technical jargon and product-specific terms - does it adapt just from usage patterns or is there a way to seed it with your own vocabulary?
"Autocomplete shouldn't live in one editor" is such a clean framing — the copy-into-VSCode-and-paste-back habit is painfully real. The local-only choice is what makes me trust it; I build voice/chat agents and privacy is usually the first objection. Question for you Daniel: how does "in your voice" stay accurate when it can't phone home — does it learn per-app (my Slack tone vs my email tone differ a lot), or is it one global style profile?
It's become a standard part of my tool kit. It keeps surprising me by suggesting not the most generically likely completions, but ones ones that are relevant to what it's learned about my style andmy topics. It's a genuine time saver.
It also ticks the boxes for privacy, starting with the fact that its AI magic happens on your Mac.
Running a local Gemma model system-wide without choking the GPU is an awesome engineering feat. The privacy angle is a no-brainer, but honestly, just being able to tab-complete in my native flow across Slack and Mail sounds like an instant workflow upgrade.
Out of curiosity, how does Cotypist handle low-level conflicts with native macOS auto-correct features?
Cotypist is awesome. I can't get through 5 minutes without it. I use it constantly. I used to use Fixkey, but Cotypist is on a whole other level. It helped me write this post!
Since it operates globally across all text inputs, how does Cotypist handle low-level conflicts with native macOS auto-correct features or spelling engines in apps like Obsidian or Mail? Do you actively filter out system suggestions to prevent visual overlapping, or does the tab-completion mechanism override them? Congrats on shipping a very much needed product!
Cotypist is great! It is even helping me to write this comment.
The way it is able to so often anticipate what I want to write next is amazing. While at the same time, quickly taking into account changes as I type too.
Excited to see how it evolves going forward.
I should note that the free plan works a lot better than you might expect, especially if you're using CoTypist for auto-suggestions and not auto-complete. 100 completed words a day sounds like nothing, but in practice I've not hit that limit yet and I use CoTypist everywhere.
Hand-wrote 51 cold outreach emails to higher ed in CO last week, would have sold a kidney for autocomplete in my own voice. then I see it's Mac only while I'm staring at my Windows taskbar. genuinely cruel. someone port this.
How do you keep the first suggestion after an idle pause from eating a cold-read penalty? Do you pin a hot subset or just accept the occasional slow first token? Great work, you guys are on the right path!
About Cotypist on Product Hunt
“Local AI Autocomplete in your voice, anywhere on your Mac”
Cotypist launched on Product Hunt on June 23rd, 2026 and earned 384 upvotes and 79 comments, earning #3 Product of the Day. Cotypist is smart autocomplete for the Mac apps you already write in: Mail, Slack, Notes, docs, even AI prompts. Press Tab when a suggestion fits, or keep typing and watch it update in real time. Runs locally on your Mac. No cloud, no API calls.
Cotypist was featured in Productivity (655.5k followers), Writing (59.2k followers) and Artificial Intelligence (472.9k followers) on Product Hunt. Together, these topics include over 260.5k products, making this a competitive space to launch in.
Who hunted Cotypist?
Cotypist was hunted by Rohan Chaubey. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
Want to see how Cotypist stacked up against nearby launches in real time? Check out the live launch dashboard for upvote speed charts, proximity comparisons, and more analytics.
Rohan Chaubey
Hey everyone, I'm Daniel, the developer behind Cotypist.
First, a quick thank-you to the Product Hunt team. After Cotypist launched back in May, they reached out and invited me back for a featured relaunch. I'm honestly a little stunned by that, and very grateful to be here again.
A few years ago, I noticed I'd developed a weird habit: copying conversations into Visual Studio Code, just to get GitHub Copilot's inline completions, then pasting them back into the app I should have been writing in. After enough of that, it clicked: autocomplete shouldn't live in one editor. It should work wherever you write.
So I built Cotypist. It's smart autocomplete that runs locally on your Mac (no cloud, no API calls), in basically every app you type into. Install it, give it a minute, and you're writing faster everywhere on your Mac. No long setup. Tab to accept a suggestion, keep going. Words still sound like you.
You can download Cotypist today from https://cotypist.app; there's a free 30-day trial with all the features, and there's also a free plan for casual use after that.
During early access, Cotypist has become a daily driver for founders, marketers, support folks, novelists, physicians, academics, and long-time Mac users. People who type a lot of email, Slack, and AI prompts. Plus a long tail I didn't see coming: non-native English speakers, one-handed typists, and (this still blows my mind!) not one but two Neuralink brain-implant wearers.
What still surprises me about Cotypist, even after building it, is how often it feels like it's reading your mind. Or almost like a colleague finishing your sentences.
Happy to take questions about the product, where it works (and where it doesn't), what's coming next, or anything else. I'll be here all day.
—Daniel