Private Writing AssistantPrivate Writing Assistant vs Grammarly
Updated October 29, 2026
Both are Chrome extensions that check and rewrite what you type on websites. The main difference is where your writing goes: Grammarly checks it on its own servers and needs an account, while Private Writing Assistant checks it on your computer with Chrome Built-in AI, for free and with no account. Grammarly gives more kinds of suggestions in its main languages and runs on any computer.
| Browser extension | Private Writing Assistant | Grammarly |
|---|---|---|
| What it checks | Spelling, grammar and punctuation, by an AI model that reads the whole sentence | Spelling and grammar; clarity, fluency and tone suggestions are limited to 3 a day on the free plan |
| Where your text is checked | On your computer, by Chrome Built-in AI | On Grammarly's servers in the cloud |
| What happens to your text | It never leaves your computer. Usage stats without any text are on by default and can be turned off | Can be used to train Grammarly's models unless you turn that off in your account settings |
| Account needed | No | Yes, a free Grammarly account |
| Price | Free | Free plan; Pro is $12 a month billed yearly ($144), or $30 billed monthly |
| Languages | 101, detected for each sentence | 23 for spelling and basic grammar; clarity and tone suggestions in 6 (English, Spanish, French, German, Portuguese, Italian) |
| Works offline | Yes, after the one-time model download | No, it needs an internet connection |
| Rewriting | Yes, in eight styles, with no limits | Full-sentence rewrites on Pro; AI prompts: 100 a month on Free, 2,000 on Pro |
| Google Docs | Yes, and Google Slides | Yes |
| Browsers | Chrome 138 or newer | Chrome, Edge, Firefox and Safari |
| 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 Grammarly is the better choice
- You want suggestions on clarity, tone and word choice in English, Spanish, French, German, Portuguese or Italian, not only corrections.
- You use Safari, Firefox or Edge, or a computer that can't run Chrome Built-in AI.
- You want extras it offers on Pro, such as a plagiarism check or AI writing from prompts.
When Private Writing Assistant is the better choice
- You write confidential text, such as client emails or contracts, and don't want it checked on someone else's servers or used to train models.
- You write in a language Grammarly doesn't cover, such as Arabic, Japanese, Chinese or Russian, or switch languages within a message.
- You write Brazilian or European Portuguese and want your variant's spelling kept. Grammarly says it doesn't tell regional variants apart yet.
- You want grammar checks and rewriting for free, with no account and no daily or monthly limits.
- You want it to keep working without an internet connection.