Private Writing AssistantPrivate Writing Assistant vs ProWritingAid
Updated October 29, 2026
ProWritingAid's Chrome extension is an English writing coach with in-depth style reports, and it sends your text to its servers to check it. Private Writing Assistant is a free grammar checker and rewriter for 101 languages that runs on your computer with Chrome Built-in AI, with no account.
| Browser extension | Private Writing Assistant | ProWritingAid |
|---|---|---|
| What it checks | Spelling, grammar and punctuation, by an AI model that reads the whole sentence | Spelling, grammar and style, plus 25+ reports such as readability and overused words |
| Where your text is checked | On your computer, by Chrome Built-in AI | On ProWritingAid's servers; some features use AI models from outside providers |
| What happens to your text | It never leaves your computer. Usage stats without any text are on by default and can be turned off | ProWritingAid says it doesn't store checked text and never uses it to train its algorithms |
| Account needed | No | Yes, a free account |
| Price | Free | Free plan: reports on 500 words at a time, twice a day each. Premium: $10 a month billed yearly, $30 monthly, or $399 once |
| Languages | 101, detected for each sentence | English only (US, UK, Canadian, Australian and General) |
| Works offline | Yes, after the one-time model download | No, it needs an internet connection |
| Rewriting | Yes, in eight styles, with no limits | Rephrase: 10 a day on Free, unlimited on Premium |
| Google Docs | Yes, and Google Slides | Yes |
| Browsers | Chrome 138 or newer | Chrome, Edge and Firefox |
| What your computer needs | 22 GB of free disk space and a graphics card with more than 4 GB of memory or 16 GB of RAM (details) | An internet connection |
Facts about the other products were checked on their own pages on October 28, 2026 and are listed under Sources. Prices are in US dollars and can change.
When ProWritingAid is the better choice
- You write long-form English, such as fiction or reports, and want detailed reports on readability, repetition and style.
- You want feedback on stories, such as chapter critiques, which it offers on paid plans.
- You use Firefox or Edge, or a computer that can't run Chrome Built-in AI.
When Private Writing Assistant is the better choice
- You write in any language other than English, or switch languages within a message.
- You don't want your text sent to anyone's servers.
- You want unlimited checks and rewrites for free, with no word limits or daily caps.
- You want it to keep working without an internet connection.