Best AI for Check grammar and improve writing
Catch grammar errors, awkward phrasing, and tone issues in real-time as you write — across emails, documents, social posts, and anything else you write online.
Grammarly
Grammarly remains the most complete writing assistant in 2026 — industry-leading accuracy on grammar and spelling, real-time integration across 500,000+ platforms (Gmail, Google Docs, Word, Slack, browser everywhere), tone detection, and a free tier that's genuinely useful for daily writers. No other tool covers as much ground in as many places. The always-on browser integration makes it more practical than competitors that require copy-paste.
Open GrammarlyIn Grammarly: Setup: - Install the browser extension AND the desktop app — browser handles web, desktop handles native apps like Word, Outlook, Slack - Configure your default writing style: primary goal, audience, tone Per-document configuration (Premium): - Audience: [GENERAL / KNOWLEDGEABLE / EXPERT] - Formality: [INFORMAL / NEUTRAL / FORMAL] - Domain: [ACADEMIC / BUSINESS / GENERAL / EMAIL / CASUAL / CREATIVE / TECHNICAL] - Intent: [INFORM / DESCRIBE / CONVINCE / TELL A STORY] - Tone target: [CONFIDENT / FRIENDLY / NEUTRAL / ANALYTICAL / RESPECTFUL] While writing: - Inline suggestions appear in real-time as you type - Hover for explanation; click to accept or dismiss - Right-click any text for "Rewrite this sentence" (Premium) for full alternatives Workflow rules: - Don't accept every suggestion blindly — Grammarly is calibrated for a specific reading age and tone, which may not match your voice - For high-stakes pieces (cover letters, contracts, executive comms), do a final read-through with Grammarly + a separate human pass - For voice-critical content (creative writing, personal essays, brand-voice writing), run Grammarly on grammar/spelling only and disable style suggestions Avoid: accepting tone-rewrite suggestions on personal correspondence without reading them — Grammarly tends to make personal writing sound more corporate.
See the difference
Before vs. after using this prompt
Writing an important email to a senior client. Re-read it three times, sent it, then realized after sending that "occured" should be "occurred" and one sentence had a comma splice. The client doesn't notice or doesn't care, but the writer is bothered for the rest of the day. Manual proofreading misses things — especially typos in words you've stared at long enough.
Same email, with Grammarly enabled. Real-time suggestions appear as the writer types: 1. "occured → occurred" (spelling, accept) 2. "We are looking forward to discuss..." → "We look forward to discussing..." (gerund after "looking forward to" — accept) 3. Tone detection: "Your tone reads as confident" (positive feedback that the intent is landing — no action needed) 4. Clarity flag: "Long sentence — consider breaking up" on a 38-word run-on (the writer reads the suggestion, decides the sentence is intentional and dismisses it) Email goes out clean in 30 seconds. The writer learned that "looking forward to" takes a gerund, not an infinitive — a pattern they'll get right automatically next time. That long-term improvement is the actual value of Grammarly: not the immediate fix, but the visible explanation that internalizes the rule.
QuillBot
Better for students and academic writers who need both grammar checking AND paraphrasing in one tool. QuillBot's paraphraser is the strongest in the market with 8 modes (Standard, Fluency, Formal, Academic, Simple, Creative, Shorten, Expand). Lower price than Grammarly Premium. Use this if rewriting and rephrasing matter as much as grammar correction.
Open QuillBotFrequently asked
Is Grammarly's free tier enough or do I need Premium?
Free tier is genuinely enough for grammar, spelling, and basic punctuation — that's what most users need most of the time. Premium ($30/mo) adds tone detection, full-sentence rewrites, vocabulary suggestions, and clarity scoring. Worth upgrading if (1) you write daily for work in high-stakes contexts (executive comms, client emails, public content), or (2) English is a second language and the rewrite suggestions help you internalize natural phrasing. For occasional writers, Free is the right answer.
What about non-English writing — does Grammarly work for other languages?
Grammarly's primary product is English-only. It supports US, UK, Canadian, and Australian English variants but doesn't check Spanish, French, German, or other languages. For multilingual writing, LanguageTool is the closest cross-language alternative — open-source, supports 30+ languages, similar real-time browser integration. Use Grammarly for your English work and LanguageTool for everything else.
Should I always accept Grammarly's suggestions?
No. Grammarly is calibrated for general business and academic writing — it's not always right for creative writing, conversational personal voice, or domain-specific style. Always accept clear errors (spelling, subject-verb agreement, capitalization). Be skeptical of style suggestions (passive-voice flags, sentence-length warnings, vocabulary upgrades) — they often standardize prose toward a generic register that strips voice. The habit that matters: read Grammarly's explanation, then decide based on whether it serves YOUR specific writing goal.