Charm and DeepL Write both improve your writing on Mac, but they work in almost opposite ways. DeepL Write is a cloud-based rewriting tool: you give it a passage and it returns a polished version with better phrasing, grammar, and tone, across 18 languages. Charm is a native Mac app that corrects spelling and grammar and predicts your next word automatically as you type, on-device, for a one-time $9.99. DeepL Write is the stronger tool for rephrasing and multilingual polish; Charm is the stronger tool for continuous, private correction as you write.
What does each tool actually do?
DeepL Write is a rewriting and style tool. You select or paste a block of text - in the DeepL Mac app, the web app, or a browser extension - and DeepL Write returns an improved version, offering clickable alternatives for words and whole sentences plus tone and style presets. It is made by DeepL, the translation company, and its output is known for reading very naturally. It is a review-and-replace tool: you invoke it on text, then copy the result back.
Charm corrects continuously as you type. Spells fixes spelling in real time, Polish corrects grammar at sentence boundaries, and Oracle predicts your next word. There is nothing to select and no button to press - corrections happen in the background in every app. Charm does not rephrase or restyle text; it keeps your own words and fixes them.
Real-time correction vs invoke-and-review
The workflows are different in a way that matters day to day. DeepL Write is deliberate: you finish writing, select the text, invoke Write, review the rewrite, and paste it back. That is good for polishing an important paragraph, but it is a separate step you have to take. If you fire off a quick message without invoking it, nothing is corrected.
Charm is passive and always on. It catches spelling and grammar errors the moment you make them, in every app, without you thinking about it. For fast, high-volume writing where you will not stop to run a rewrite pass, Charm covers what you would otherwise send uncorrected.
Is your text private?
DeepL Write is cloud-based: text you want improved is sent to DeepL's servers. DeepL states that on its Pro plans your data is not stored, shared, or used to train its models, and it uses encrypted, certified data centres; free-tier handling is less protective. Either way, the text leaves your machine to be processed.
Charm processes everything on-device. There is no cloud mode in the app at all, so your text never leaves your Mac under any setting. For confidential or regulated writing, that is the simplest possible guarantee.
| Feature | Charm | DeepL Write |
|---|---|---|
| Correction trigger | Automatic as you type | Select text and invoke |
| Real-time spelling correction | Yes - Spells | On invoke |
| Grammar correction | Yes - Polish | Yes |
| Rephrasing and tone or style | No | Yes - its core focus |
| Word prediction | Yes - Oracle | No |
| Languages | English-focused | 18 languages |
| On-device only (no cloud) | Yes | No - cloud-based |
| Pricing | $9.99 once | Subscription add-on from about $7.49/month |
How do the prices compare?
DeepL Write has a free tier capped at about 2,000 characters per text. DeepL Write Pro is roughly $7.49 per user per month on annual billing, and it is an add-on that usually sits on top of a DeepL plan rather than a standalone purchase. There is no one-time option.
Charm is $9.99 once, no subscription, with a licence covering up to 3 Macs. If your writing is mostly in English and you want continuous correction rather than on-demand rewriting, Charm covers it for a single payment.
Where does DeepL Write have the edge?
DeepL Write has two real strengths. First, its output quality is excellent - the rephrasing reads naturally and is well regarded for clarity and flow. Second, it supports 18 languages with genuinely strong multilingual quality, which is DeepL's core expertise. If you write regularly in more than one language, or you want a tool to actively rewrite and restyle passages, DeepL Write does things Charm does not attempt. Charm is focused on English and on correcting your own words rather than rewriting them.
Frequently asked questions
What is the difference between Charm and DeepL Write?
DeepL Write is a cloud-based rewriting and style tool: you select or paste text and it returns a polished version across 18 languages. Charm corrects spelling and grammar and predicts your next word automatically as you type, on-device, for a one-time $9.99. DeepL Write rewrites on demand; Charm corrects continuously.
Does DeepL Write correct text automatically as you type?
No. DeepL Write is invoke-and-review: you select or paste text, run it through Write, and copy the improved version back. Charm corrects spelling in real time as you type and fixes grammar at each sentence boundary, with nothing to select or invoke.
Is DeepL Write better for other languages than English?
DeepL Write supports 18 languages with strong multilingual quality, so it is a good choice if you write in several languages. Charm is focused on English. If multilingual rewriting is your main need, DeepL Write has the edge there.
Does DeepL Write keep my text private?
DeepL Write is cloud-based, so text is sent to DeepL's servers. DeepL says Pro plan data is not stored or used for training; free-tier handling is less protective. Charm has no cloud mode at all, so your text never leaves your Mac.
Does DeepL Write do word prediction?
No. DeepL Write improves 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.