Grammarly vs QuillBot

Grammarly and QuillBot are both AI Writing tools (Writing Assistants). Below: what each costs, what it does well, its biggest catches, and who should pick which, all from public sources rather than our own testing.

Side by side

GrammarlyQuillBot
CategoryAI Writing & Content · Writing ToolsAI Writing & Content · Writing Tools
PricingFree tier: yes. Pro $12/mo billed annually (reviews report $30 month-to-month). 7-day free trial. (checked Oct 10, 2026)Free tier: yes. Premium $19.95/mo, $39.95 per 3 months, or $99.95/yr. (checked Oct 10, 2026)
Pros
  • Real-time grammar, clarity and tone fixes in most apps you already write in
  • The free plan is genuinely usable for basic correctness
  • Pro includes 2,000 AI prompts per member per month (Free gets 100)
  • Usable free tier: paraphraser, grammar checker, translator and AI detector
  • Premium is $8.33/mo on annual billing
  • Nine paraphrase modes plus a synonym slider for fine control
Catches
  • $12/mo only applies on annual billing ($144 upfront). Reviews report $30 for month-to-month
  • AI prompts are capped, even on Pro
  • Suggestions can flatten your voice and flag technical jargon
  • Free paraphrases only 125 words at a time
  • No free trial, just a 3-day money-back guarantee (per review)
  • The plagiarism checker is Premium-only and capped at 25,000 words/month
Best forProfessionals and non-native English writers who write all day.Students and writers polishing or rewording drafts.
Skip it ifYou write occasionally. Free, or the chatbot you already pay for, is enough.You need original writing rather than rewrites.

Which should you pick?

Pick Grammarly if…

you fit this: professionals and non-native English writers who write all day.

But not if: you write occasionally. Free, or the chatbot you already pay for, is enough.

Watch out for: $12/mo only applies on annual billing ($144 upfront). Reviews report $30 for month-to-month.

Pick QuillBot if…

you fit this: students and writers polishing or rewording drafts.

But not if: you need original writing rather than rewrites.

Watch out for: Free paraphrases only 125 words at a time.

More options

Sources

Grammarly

QuillBot

Pros, catches and prices are compiled from public sources (official pricing and docs pages, published reviews, user reports), not hands-on testing. Prices change often, so check the vendor page before you buy.