GrammarPro

Free plan Web

What GrammarPro is

GrammarPro is a browser-based AI checker for grammar, spelling, punctuation, clarity, tone, and concise writing. Its six modes are Grammar, Spelling, Punctuation, Clarity, Formal Tone, and Concise Writing. Corrections appear word by word in real time and include explanations for suggested changes. The service says it supports more than 30 languages; its About page names English, Spanish, French, German, Portuguese, Chinese, and Japanese. The free plan costs nothing, allows three daily checks without an account or five when signed in, and limits each request to 500 words. Pro Monthly costs $7.99 a month, while Pro Annual costs $59.99 a year; both provide unlimited checks and 5,000-word requests. GrammarPro works in a browser on any device without installation. It has no browser extension, desktop app, or mobile app. Submitted text is sent to OpenAI’s API and is not stored after processing; the service advises against entering sensitive personal information.

Who it suits

GrammarPro suits students, professionals, non-native English speakers, writers, and bloggers needing browser-based writing checks. The free tier fits shorter, occasional requests.

What it does well

Six grammar and writing modes
Real-time corrections with explanations
Supports more than 30 languages
Works in a browser on any device
Free plan available

What to know first

Free requests limited to 500 words
Daily free-check limits apply
No browser extension, desktop, or mobile app
Submitted text goes to OpenAI’s API

Plans

Plan	Billed and limits	Price
Free	forever · 3 grammar checks/day without an account · 5/day signed in · 500-word limit · all 6 checking modes	Free
Pro Monthly	monthly · Unlimited grammar checks · 5,000-word limit · all 6 checking modes · priority processing · cancel anytime	$7.99 a month
Pro Annual	yearly · Unlimited grammar checks · 5,000-word limit · all 6 checking modes · priority processing · cancel anytime · save 37% vs monthly	$59.99 a year

As grammarpro.ai lists them, read 8 Oct 2026. The maker's own page has the final word.

Verdict

GrammarPro provides several focused checking modes with a free option and browser access on any device. Choose a paid plan when the free word and daily-check limits are too restrictive.

Facts from GrammarPro's own pages

AI engine: The About page says GrammarPro is powered by GPT-4o-mini. · grammarpro.ai, 8 Oct 2026
Browser extension: No · grammarpro.ai, 20 Sept 2026
Checking modes: It offers Grammar, Spelling, Punctuation, Clarity, Formal Tone, and Concise Writing modes. · grammarpro.ai, 8 Oct 2026
Corrections: The homepage says corrections stream word by word in real time and include explanations for suggested changes. · grammarpro.ai, 8 Oct 2026
Desktop app: No · grammarpro.ai, 20 Sept 2026
Free plan: Yes · grammarpro.ai, 20 Sept 2026
Integrations: The privacy policy identifies OpenAI's API as a third-party service used to process text. · grammarpro.ai, 8 Oct 2026
Intended users: The About page identifies students, professionals, non-native English speakers, writers, and bloggers as intended users. · grammarpro.ai, 8 Oct 2026
Languages: The homepage says it supports more than 30 languages, while the About page lists English, Spanish, French, German, Portuguese, Chinese, and Japanese. · grammarpro.ai, 8 Oct 2026
Limits: The homepage says free use is limited to 500 words per request and Pro to 5,000 words; pricing lists three daily free checks without an account and five when signed in. · grammarpro.ai, 8 Oct 2026
Mobile app: No · grammarpro.ai, 20 Sept 2026
Privacy: GrammarPro says it does not store submitted text after processing, but sends text to OpenAI's API and recommends not submitting sensitive personal information. · grammarpro.ai, 8 Oct 2026
Purpose: GrammarPro checks and corrects grammar, spelling, punctuation, and writing style with AI. · grammarpro.ai, 8 Oct 2026
Security: Its privacy policy says it uses reasonable security measures and that internet transmission is not completely secure. · grammarpro.ai, 8 Oct 2026
Style suggestions: Yes · grammarpro.ai, 20 Sept 2026
Support: The About page provides [email protected] for questions or feedback and the privacy policy provides [email protected] for privacy questions. · grammarpro.ai, 8 Oct 2026
Supported environment: GrammarPro says it works in the browser on any device and requires no installation or download. · grammarpro.ai, 8 Oct 2026
Tone detection: Yes · grammarpro.ai, 20 Sept 2026

Where GrammarPro stands on Freedom251

Grammar checkers#59 of 88