Charm and QuillBot both help you write better on Mac, but they are built for different jobs. QuillBot is a cloud-based writing suite best known for paraphrasing, wrapped around a grammar checker, summarizer, and plagiarism and AI-detection tools. Charm is a native Mac app that corrects spelling and grammar and predicts your next word in real time, entirely on-device, for a one-time $9.99. QuillBot is the stronger tool for rewriting and rephrasing; Charm is the stronger tool for continuous, private correction across every app you type in.
What does each tool actually do?
QuillBot is a paraphrasing suite. Its standout feature is the Paraphraser, which rewords a passage into different tones and styles. Around it sits a grammar checker, a summarizer, a plagiarism checker, an AI detector, and a translator. QuillBot has a Mac menu-bar app that shows inline suggestions as you type, and browser, Word, and Google Docs integrations. It is a capable, actively maintained product with a large user base.
Charm does three jobs in one app. Spells corrects spelling in real time as you type, Polish corrects grammar at the end of each sentence, and Oracle predicts your next word so you can accept it with the Tab key. All three run continuously in the background across your whole Mac. Charm does not rewrite or paraphrase text; it corrects and predicts as you write.
Does QuillBot work in every Mac app?
No. QuillBot's Mac app works in a fixed list of supported apps - things like Notes, Messages, Slack, Teams, and Word - and you grant it access to each one. Apps outside that supported list get nothing. Its heavier features, such as paraphrasing and summarizing, still run in QuillBot's own web surface where you paste text in.
Charm works in every text field on your Mac. It uses the macOS Accessibility API together with a keyboard-event tap to correct text in native apps, browsers, code editors, and Terminal alike. You set it up once and it runs everywhere, without a per-app supported list.
Is your text private?
This is the sharpest difference. QuillBot is cloud-based: the text you write or paste is sent to QuillBot's servers to be processed. As of its November 2025 privacy update, QuillBot stores your text inputs on its servers by default and may use them to train its AI models, with an opt-out available only to logged-in account holders. For anyone handling confidential or client material, that is a real consideration.
Charm processes everything on-device. Spelling, grammar, and prediction all happen locally, and your text never leaves your Mac. There is no account, no server, and no training on your writing.
| Feature | Charm | QuillBot |
|---|---|---|
| Real-time spelling correction | Yes - Spells | In supported apps |
| Grammar correction | Yes - Polish | Yes |
| Word prediction | Yes - Oracle | No |
| Paraphrasing and rewriting | No | Yes - its core focus |
| Works in every Mac app | Yes | No - supported-app list |
| On-device and private | Yes | No - cloud, stores and trains on text by default |
| Pricing | $9.99 once | Subscription (about $100/year) |
How do the prices compare?
QuillBot is subscription-only. There is a free tier, but it is thin for the writing tools - the free Paraphraser is capped at around 125 words per rephrase and two of its nine modes, and the plagiarism checker is Premium-only. QuillBot Premium is about $19.95 per month, or roughly $99.95 per year. There is no one-time or lifetime option.
Charm is $9.99 once, with everything included and no recurring charge. A single licence covers up to 3 Macs. Over three years, QuillBot Premium costs around $300; Charm is a single $9.99 payment over the same period.
Where does QuillBot have the edge?
QuillBot's paraphrasing is genuinely its standout, and Charm does not compete with it - if your main need is rewording, restructuring, or changing the tone of text you have already written, QuillBot does that well. Its summarizer, plagiarism checker, and AI detector are useful extras that Charm does not offer at all, and QuillBot runs across Windows, mobile, the web, and Office, not just Mac. For students and writers who want an all-in-one rewriting and checking toolkit and do not mind the cloud or the subscription, QuillBot is a strong pick.
Charm is the better choice if you want correction and prediction that happen automatically as you type, in every Mac app, entirely on-device, for a one-time price - rather than a paste-and-rewrite workflow in the cloud.
Frequently asked questions
What is the difference between Charm and QuillBot?
QuillBot is a cloud-based paraphrasing suite with grammar, summarizing, and plagiarism tools, sold on a subscription. Charm is a native Mac app that corrects spelling and grammar and predicts your next word in real time, on-device, for a one-time $9.99. QuillBot rewrites text; Charm corrects and predicts as you type.
Does QuillBot work in every Mac app?
No. QuillBot's Mac app works in a fixed list of supported apps such as Notes, Messages, Slack, and Word, and its rewriting tools run in QuillBot's own web surface. Charm works in every text field on your Mac via the Accessibility API, including native apps, browsers, code editors, and Terminal.
Is QuillBot free or a subscription?
QuillBot has a limited free tier and a Premium subscription at about $19.95 per month or $99.95 per year. There is no one-time option. Charm is a single $9.99 payment with no recurring charge.
Does QuillBot keep my text private?
No. QuillBot is cloud-based and, as of its November 2025 privacy update, stores your text inputs by default and may use them to train its models, with an opt-out only for logged-in account holders. Charm processes everything on-device, so your text never leaves your Mac.
Does QuillBot do word prediction?
No. QuillBot corrects and rewrites text you have already written; it does not predict your next word. Charm includes Oracle, a word-prediction feature you accept with the Tab key, alongside its spelling and grammar correction.