Head to head

QuillBot vs Grammarly

The verdict

Grammarly is the better tool for most people — its grammar detection and writing suggestions are genuinely superior, but if you need paraphrasing and summarizing on a budget, QuillBot earns its keep. Pay for Grammarly if writing quality matters professionally; use QuillBot free tier if you are a student rewording sources.

PriceQuillBot

Ease of useGrammarly

Output qualityGrammarly

Feature by feature

FeatureQuillBotGrammarly

Pricing (Premium)QuillBot Premium: $9.95/mo (annual: $4.17/mo)Grammarly Premium: $30/mo (annual: $12/mo)

Free Tier Limits125 words per paraphrase, 3 paraphrase modes, basic summarizerBasic grammar and spelling only, no tone/clarity suggestions, heavily paywalled

Context WindowUp to 10,000 words per session on Premium for paraphrasingHandles full documents; no hard published word cap, works on long-form easily

Best Use CaseRewording sentences, paraphrasing academic text, summarizing articlesProfessional writing, emails, grammar correction, tone adjustment, full editing

Biggest WeaknessCannot teach you to write better — just rewrites what you give it; grammar checking is mediocre$30/mo base price is highway robbery; free tier is nearly useless as a teaser

SpeedFast — paraphrasing results in under 2 seconds consistentlyReal-time inline suggestions with slight lag on large documents; browser extension adds overhead

Data PrivacyStores text to improve models; opt-out unclear; not recommended for sensitive docsStores your text; enterprise plan has stricter controls; free users have weakest protections

API AvailabilityNo public API available for developersGrammarly API exists but is enterprise-gated; not accessible for indie developers easily

Real cost breakdown

Moderate monthly use (roughly 50,000 words edited/month): QuillBot Premium annual plan costs $4.17/mo — about $50/year total. Grammarly Premium annual plan costs $12/mo — $144/year. Grammarly costs 2.9x more annually. Per-word, QuillBot is fractions of a cent; Grammarly does not publish per-token pricing but at $144/year for unlimited use it is still reasonable for heavy users. The gap hurts casuals: if you write occasionally, Grammarly's $30 monthly rate is nearly indefensible versus QuillBot's $9.95.

When to switch

Drop QuillBot for Grammarly when: you are a professional whose writing is judged — job applications, client emails, reports — and errors cost you money or reputation. Grammarly catches nuanced grammar mistakes, passive voice abuse, and tone mismatches that QuillBot completely ignores. Drop Grammarly for QuillBot when: you are a student or researcher who needs to paraphrase sources quickly and cheaply, or when Grammarly's premium paywall blocks every useful feature and you refuse to pay $30/mo for what should be baseline functionality.

This comparison is independent. Neither company paid us or reviewed this content before publication. Pricing verified as of publication date — check official sites for current rates.