A lot of writing tools are built around one quiet assumption: if you want help with your writing, the draft has to leave the place where you are writing it.
That can mean opening a browser tab, pasting into a chatbot, using a cloud editor, or installing an extension that reads the page you are typing into.
For some writing, that is fine.
For other writing, it is not.
Client emails, internal notes, personal messages, support replies, private docs, and half-finished thoughts are not always things people want to send to a cloud writing service just to clean up one sentence.
That is why I think the useful Grammarly alternative for Mac is not just "AI grammar correction." It is local writing help that stays close to the cursor.
The problem is the round trip
Most AI writing workflows still have the same shape:
- Write something awkward.
- Copy it.
- Open another app.
- Paste it.
- Ask for a rewrite.
- Copy the result.
- Paste it back.
- Edit it again because the tone is not quite right.
That is tolerable once.
It gets annoying when the job is a short email, a support answer, a GitHub comment, a note, or a message you are already writing in a normal Mac text field.
The better interface is not always a new AI document editor. Sometimes the better interface is the text box you already picked.
Local writing help feels different
A local Mac writing assistant has a different set of tradeoffs.
The model has to run on your machine. Setup is heavier. There may be a model download. Performance depends on the Mac. The app has to ask for macOS permissions, and it has to be honest about where it can and cannot interact with text.
But the upside is important: the text does not need to become a cloud request for every completion or rewrite.
For everyday writing assistance, that changes the feeling of the tool. You can ask for a shorter version, a clearer version, or the next few words without treating every rough paragraph like something you are submitting to a remote service.
The honest Mac limitation
The tempting marketing line is "works everywhere."
For a Mac text-field assistant, that is not honest.
macOS apps expose text differently. Standard text fields are usually more cooperative. Custom editors, web views, terminal panes, secure fields, and heavily sandboxed apps can behave differently.
So the realistic promise is narrower:
- autocomplete in compatible macOS text fields
- rewrite selected text where the app can safely access and replace it
- let the user review changes
- avoid pretending every app exposes text the same way
That is less flashy than "AI in every app," but it is a better expectation.
What I am building
I am building DraftKey around this idea: private, on-device AI autocomplete and instruction-based rewriting inside compatible macOS text fields, plus optional mechanical keyboard typing sounds: https://www.getdraftkey.com/
It is a native Mac app for Apple Silicon Macs running macOS 14 or later. The AI setup needs enough memory and a local model download, which is the cost of not making the core writing flow depend on a cloud model.
I do not think every writing tool needs to be local.
Cloud AI is powerful, convenient, and useful for a lot of work.
But for the small writing moments that happen all day, the interesting direction is different: less "open an AI app" and more "get private writing help where the cursor already is."
That is the Grammarly alternative for Mac I actually want.
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