Quick answer: Grammarly checks and improves your writing as you type, inside Gmail, Google Docs, Word, Slack and many other apps. QuillBot is built around paraphrasing, with several rewrite modes, a summarizer and a plagiarism checker. Both have free plans, and QuillBot Premium costs less.
Pick Grammarly if…
- You want corrections and tone suggestions inside the apps where you already write
- You want each suggestion explained, so you learn as you go
- You write for clients every day and want full-sentence rewrites and plagiarism checks
Pick QuillBot if…
- You mostly rewrite text and want modes like Formal, Simple, Shorten or Academic
- You summarize long documents
- You want a lower-cost premium plan ($8.33 a month billed yearly)
Grammarly vs QuillBot at a glance
| Grammarly | QuillBot | |
|---|---|---|
| What it is | Grammarly is an AI writing assistant that checks grammar, clarity, and tone and offers rewrite suggestions as you write. | QuillBot is an AI writing assistant that paraphrases, checks grammar, detects plagiarism, and summarizes text. |
| Best for | Freelancer, Solo Consultant, Content Creator | Freelancer, Solo Consultant, Content Creator |
| AIME Score | 89 | 62 |
| Reviews | Proven (10,000+ reviews) | Proven (25+ reviews) |
| Free plan | Yes | Yes |
| Starting price | Pro: $12 per member a month, billed yearly ($30 monthly) (as of October 2026) | Premium: $8.33 a month, billed yearly (as of October 2026) |
| Platforms | Mobile app | Chrome extension, Mac app, iPhone & iPad app, Android app |
| Works with | Not listed | Not listed |
| Standout features |
|
|
Reviews: our public review level, never exact counts. Free plan and prices: from each tool’s own pricing page; plans change, so check there before you buy.
Where they differ
Main job: Grammarly is built for proofreading and tone as you type, with rewrites on top. QuillBot is built around its paraphraser, which rewrites text in modes like Standard, Fluency, Creative, Formal, Simple, Shorten, Expand and Academic, and lets you build custom modes.
Where they work: Grammarly works inside more than a million apps and sites with one install. QuillBot works through Chrome and Edge extensions, a Word add-in and apps for Mac, iPhone and Android.
Free plans: The Grammarly free plan covers spelling, basic grammar and tone detection, with 3 advanced suggestions a day. The QuillBot free plan paraphrases up to 100 words at a time in 2 modes, fixes basic grammar and makes basic summaries.
Paid plans: Grammarly Pro is $12 a month billed yearly ($30 monthly). QuillBot Premium is $8.33 a month billed yearly.
Checks: Both check for plagiarism and AI-written text. The QuillBot plagiarism checker covers up to 25,000 words a month; Grammarly builds plagiarism and AI-text checks into Pro.
AIME Score: Grammarly has the higher AIME Score: 89 out of 100, against 62 for QuillBot. Both are Proven tools (4.0 stars or better from 25 or more verified reviewers). How the AIME Score works
Where they’re the same
Both are writing assistants with free plans that catch grammar mistakes, rewrite sentences, check for plagiarism and detect AI-written text, with browser extensions and mobile apps.
Pricing in plain words
Grammarly
Start on Free. Move to Pro when you write for clients every day and want rewrites, tone adjustment and plagiarism checks. Enterprise is for larger organizations.
- Free: $0 forever
- Pro: $12 per member a month, billed yearly ($30 monthly)
- Enterprise: Custom (contact sales)
Pro has a 7-day free trial with no payment up front. Prices from grammarly.com and grammarly.com/plans on October 10, 2026; check there before you buy.
QuillBot
The free plan paraphrases up to 100 words at a time in 2 modes, fixes basic grammar and makes basic summaries. Premium opens full paraphrasing in every mode.
- Free: $0 a month
- Premium: $8.33 a month, billed yearly
Prices from quillbot.com/premium on October 24, 2026; check there before you buy.
Who should choose which
Choose Grammarly
People use Grammarly to proofread and rewrite text, adjust tone for different audiences, and check if writing sounds AI-generated or human.
Best for: Freelancer, Solo Consultant, Content Creator
Choose QuillBot
People use QuillBot to rewrite and polish drafts, catch grammar errors, check for plagiarism, and summarize long documents.
Best for: Freelancer, Solo Consultant, Content Creator
Questions
What is the difference between Grammarly and QuillBot?
Grammarly corrects and polishes your writing as you type, in almost any app. QuillBot is built for rewriting and summarizing text, with many paraphrase modes.
Is Grammarly or QuillBot cheaper?
QuillBot Premium is $8.33 a month billed yearly. Grammarly Pro is $12 a month billed yearly, or $30 paid monthly.
Do Grammarly and QuillBot have a free plan?
Yes, both have a free plan. Free plans have limits, so check what each one includes in the pricing section above.
Which has the higher AIME Score, Grammarly or QuillBot?
Grammarly has the higher AIME Score: 89 out of 100, against 62 for QuillBot. Both are Proven tools (4.0 stars or better from 25 or more verified reviewers). The AIME Score is our 0 to 100 score for every AI tool; partner links never change it.
Should I pick Grammarly or QuillBot?
Pick Grammarly if you want corrections and tone suggestions inside the apps where you already write. Pick QuillBot if you mostly rewrite text and want modes like Formal, Simple, Shorten or Academic.
More comparisons
Sources
- Grammarly: AI Made Easy profile and Spotlight research (checked October 10, 2026)
- QuillBot: AI Made Easy profile; prices from quillbot.com/premium (checked October 24, 2026)
- AIME Score and review level: How the AIME Score works. We never show exact review counts or other sites’ ratings.