Grammar Guru
What Grammar Guru is
Grammar Guru is a writing assistant for checking and revising text. It flags grammar, spelling, and punctuation issues as you type, then offers suggestions aimed at clearer, more concise writing. Its rewriting tool can reshape text in different tones and styles, and the product also lists tone detection and style suggestions. You can use it on the web, through Chrome or Edge extensions, and on Linux, macOS, or Windows. The extension page says it works across more than 1 million websites, including Gmail, Google Docs, Facebook, Twitter, and LinkedIn. Chrome support for Gmail and Google Docs is listed, as is Edge support for Outlook and Office 365. Chrome and Edge extensions require version 88 or later; Firefox and Safari extensions are in development. The free plan includes five rewrites per day and a 500-character limit. Standard costs $1 a month, with yearly billing shown as $0.83/month, and includes unlimited rewrites with a 50,000-character limit. A separate Windows App plan costs $1 a month and includes offline support, while the AI grammar and rewriting services require an internet connection. The native Windows app requires Windows 10 or later and a 64-bit processor.
Who it suits
Grammar Guru suits people who want grammar and style suggestions while writing, or who need to rewrite text in different tones. Its browser extensions and listed email and document integrations fit users working in Chrome or Edge; the Windows App plan may suit Windows users who need offline support.
What it does well
- Checks grammar, spelling, and punctuation as you type.
- Rewrites text using different tones and styles.
- Works on web, Linux, macOS, and Windows.
- Chrome and Edge extensions support version 88 or later.
- Standard includes unlimited rewrites and batch processing.
- Windows App plan includes offline support.
What to know first
- Free plan allows five rewrites per day.
- Free plan has a 500-character limit.
- No mobile app is listed.
- Firefox and Safari extensions are still in development.
Limits
The Free plan provides five daily rewrites, basic grammar checking, and a 500-character limit. Standard costs $1 a month and has a 50,000-character limit; the Windows App plan at the same monthly price advertises offline support. The AI grammar and rewriting services require an internet connection.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Free | Forever · 5 daily rewrites · basic grammar checking · 500 character limit · works on all websites · daily usage reset | Free |
| Standard | Monthly; $0.83/month when billed yearly · Unlimited rewrites · advanced grammar rules · 50,000 character limit · all writing styles and tones · priority support · batch processing | $1 a month |
| Windows App | Monthly; $0.83/month when billed yearly · Unlimited rewrites · email drafting · text summarization · list formatting · translation · offline support · Windows integration | $1 a month |
| Enterprise | Custom pricing · Everything in Standard · team management · usage analytics · custom integrations · dedicated support · SLA guarantee · coming soon; join waitlist | On request |
As grammarguruai.com lists them, read 21 Oct 2026. The maker's own page has the final word.
Getting started
- Visit grammarguruai.com.
- Choose the web version or a browser extension for Chrome 88 or later or Edge 88 or later.
- For Chrome, use the listed Gmail and Google Docs support; for Edge, use Outlook and Office 365 support.
- For Windows, install the native app on Windows 10 or later with a 64-bit processor.
- Choose the Free plan or a paid plan; Standard and Windows App are listed at $1 a month.
Verdict
Choose Grammar Guru if you want writing corrections and rewriting across its web, desktop, or browser extension options. The free plan has daily and character limits, while Standard raises the rewrite allowance and character limit. Windows users who need offline support can consider the separate Windows App plan.
Questions
Is Grammar Guru free?
Yes. Its Free plan is billed forever and includes five daily rewrites, basic grammar checking, standard support, and a 500-character limit.
How much do the paid plans cost?
Standard and Windows App are each listed at $1 a month, with yearly billing shown as $0.83/month. Enterprise pricing is on request.
What platforms does Grammar Guru support?
The listed platforms are web, extension, Linux, macOS, and Windows. No mobile app is listed.
Which browsers and integrations are supported?
Chrome and Edge extensions require version 88 or later. Gmail and Google Docs support is listed for Chrome, while Outlook and Office 365 support is listed for Edge.
Does Grammar Guru work offline?
The Windows App plan advertises offline support. The pricing page says the AI grammar and rewriting services require an internet connection.
Who processes text and how is it handled?
The privacy policy lists Azure OpenAI for AI language processing and says submitted text is processed in real time, then discarded after suggestions. It also says usage statistics and account information may be retained.
Facts from Grammar Guru's own pages
- API and SDKs
- The maker pages reviewed describe browser extensions and a Windows app but do not provide public API or SDK documentation. · grammarguruai.com, 21 Oct 2026
- Browser extension
- Yes · grammarguruai.com, 21 Sept 2026
- Browser roadmap
- The download page says Firefox and Safari extensions are being worked on. · grammarguruai.com, 21 Oct 2026
- Browser support
- The extension supports Chrome 88 or later and Edge 88 or later; Firefox and Safari extensions are described as in development. · grammarguruai.com, 7 Oct 2026
- Chrome integration
- The maker lists Gmail and Google Docs support for its Chrome extension. · grammarguruai.com, 21 Oct 2026
- Company facts
- The reviewed pages do not establish a legal company name, founding year, headquarters, company size, or funding for the maker of this product. · grammarguruai.com, 21 Oct 2026
- Desktop app
- Yes · grammarguruai.com, 21 Sept 2026
- Edge integration
- The maker lists Outlook and Office 365 support for its Edge extension. · grammarguruai.com, 21 Oct 2026
- Free plan
- Yes · grammarguruai.com, 21 Sept 2026
- Grammar and style
- The product detects grammar, spelling, and punctuation errors as users type and suggests improvements for clarity, conciseness, and engagement. · grammarguruai.com, 7 Oct 2026
- Grammar checking
- The product says it detects and helps correct grammar, spelling, and punctuation errors as users type. · grammarguruai.com, 21 Oct 2026
- Independent review coverage
- Searches for Grammar Guru tied to grammarguruai.com did not surface product listings or ratings on G2, Capterra, GetApp, Software Advice, TrustRadius, Trustpilot, or Gartner Peer Insights. · itechguides.com, 21 Oct 2026
- Integrations
- The maker lists Gmail and Google Docs support for Chrome and Outlook and Office 365 support for Edge. · grammarguruai.com, 7 Oct 2026
- License and hosting
- The maker pages reviewed do not state an open-source license or offer self-hosting instructions. · grammarguruai.com, 21 Oct 2026
- Limit
- The pricing page says Grammar Guru requires an internet connection for its AI grammar and rewriting services, while the Windows App plan separately advertises offline support. · grammarguruai.com, 7 Oct 2026
- Limit: enterprise pricing
- The pricing page lists Enterprise as custom priced and says it is coming soon with a waitlist. · grammarguruai.com, 21 Oct 2026
- Limit: internet dependence
- The pricing FAQ says the AI grammar and rewriting services require an internet connection. · grammarguruai.com, 21 Oct 2026
- Limit: language coverage
- GeekChamp says the maker does not publish language coverage. · geekchamp.com, 21 Oct 2026
- Limit: mobile availability
- GeekChamp reports that no mobile app is offered. · geekchamp.com, 21 Oct 2026
- Maker identity
- The Chrome Web Store listing identifies grammarguruai.com as the extension's publisher website and gives [email protected] as the developer contact. · chromewebstore.google.com, 21 Oct 2026
- Mobile app
- No · grammarguruai.com, 21 Sept 2026
- Offline use
- The Windows App plan advertises offline operation, while the pricing FAQ says AI grammar and rewriting services require an internet connection. · grammarguruai.com, 21 Oct 2026
- Operating systems
- The Chrome extension requirements list Windows, macOS, or Linux, while the Edge requirements list Windows or macOS. · grammarguruai.com, 7 Oct 2026
- Praise: desktop options
- GeekChamp points to the browser extension and Windows app as useful coverage for desktop writing. · geekchamp.com, 21 Oct 2026
Where Grammar Guru stands on Freedom251
- Grammar checkers#16 of 88