Isn't the macOS spell checker enough?

It catches spelling, not grammar. An AI grammar pass handles agreement, tense, run-ons, and awkward phrasing that the built-in checker leaves alone.

Will it change my writing style?

Only if you let it. You prompt the model, so you can ask it to fix grammar and punctuation while keeping your wording and tone.

Does it monitor everything I type?

No. You choose which clip to correct and when. There's no background keystroke monitoring; corrections are deliberate.

Where does my text go during a correction?

Directly from your Mac to the AI provider you configured with your own API key. ClipHistory has no cloud and stores nothing on its own servers.

The Best Way to Fix Grammar on Mac

macOS has a built-in spell checker, and it catches typos. What it misses is grammar: subject-verb agreement, dangling modifiers, tense drift, and the awkward phrasings that make writing read like a draft. Dedicated grammar apps fill that gap, but most run as a browser extension or a service that watches everything you type. If you'd rather keep corrections deliberate and your text on your own machine, a clipboard-based approach is worth considering.

Fix grammar where your text already is

ClipHistory is a clipboard manager for macOS that can run AI transforms on copied text. The flow is simple: copy the sentence or paragraph you want checked, press Cmd+Shift+V to open the clip list, select your clip, and run a transform. The corrected text becomes a new clip you paste back wherever you were working.

Nothing watches you type. You decide what gets checked and when, by choosing which clip to transform. That's a meaningful difference if you write sensitive material and don't want a background process reading every keystroke.

What a grammar pass should and shouldn't do

A focused grammar correction:

Fixes agreement, tense, articles, prepositions, and punctuation.
Repairs run-ons and fragments.
Leaves your voice and word choices alone unless they're wrong.

It should not silently rewrite your tone or replace your terminology. Because you're prompting a language model, you can ask for exactly this: "fix grammar and punctuation only, keep my wording." ClipHistory works with five providers, Anthropic, OpenAI, DeepSeek, Google, or a custom endpoint, using your own API key, so you can pick the model whose corrections you trust.

Local by design

ClipHistory keeps your clipboard history on your Mac. There's no cloud service and no account to create. When you run a grammar transform, the text goes directly from your machine to the AI provider you set up with your own key, and no copy is stored on a ClipHistory server, because there isn't one.

The app is a universal binary, signed and notarized by Apple, running natively on both Apple Silicon and Intel Macs and requiring macOS 12 or newer.

A repeatable grammar workflow

Write your message or document as usual.
Select a paragraph and copy it.
Press Cmd+Shift+V, choose the clip, and run the grammar transform.
Compare the corrected clip to the original, which is still in your history.
Paste the version you want.

If you correct the same kind of writing constantly, save your instruction as a snippet so you don't retype "fix grammar only, preserve voice." For phrases or signatures you reuse, pin them. Pinned clips are unlimited and aren't pushed out by the 150-clip limit on regular history.

Pair it with rewriting

Grammar and concision are different jobs. A sentence can be grammatically perfect and still bloated. Fix grammar first, then run a separate rewrite pass if the text is wordy. Keeping the two steps distinct gives you cleaner results than asking one prompt to do everything.

Writing in a second language

Grammar checking matters most when you're writing in a language that isn't your first. The mistakes there aren't typos, they're articles, prepositions, and verb forms that native software glosses over. A clipboard grammar pass is a low-pressure way to check yourself: draft the message in your second language, copy it, run the transform, and compare. You learn from the corrections instead of just accepting them, because the original is still sitting in your history next to the fixed version.

Where it pays off

The same flow covers most of what you write in a day:

Email and outreach: A grammatically clean message reads as careful, which is exactly the impression you want before someone has met you.
Documentation and READMEs: Errors in docs erode trust in the thing being documented. A quick pass before you publish helps.
Public posts and comments: Anything with your name on it in front of an audience is worth thirty seconds of checking.

Because the correction happens on the clipboard, none of these require switching tools. You stay in your editor, your inbox, or your browser.

Why a one-time license fits daily editing

Grammar checking is something you do many times a day, every day. ClipHistory is a one-time purchase, $19.99 for a 12-month license, with no auto-renewal, so a constant-use tool doesn't turn into a recurring charge you forget about. You supply your own API key, so AI costs are billed directly by your provider with nothing added on top.

Clean grammar is the baseline of writing that gets taken seriously. Doing the fix from your clipboard means it's one shortcut away, in whatever app you happen to be in.

Get ClipHistory for macOS ($19.99, one-time): https://cliphistory.com/download