Grammarly vs QuillBot: Grammar Checker or Paraphrase Engine?
Grammarly and QuillBot get thrown into the same "best AI writing tool" roundups constantly, but they were not built to solve the same problem. Grammarly started as a correctness layer that rides along wherever you type, catching spelling, grammar, and punctuation before you hit send. QuillBot started as a paraphrasing tool built for students reworking a paragraph for a paper, and it has grown into a wider suite around that same core skill: rewriting text, not just correcting it. Knowing which job you actually have is most of the decision.
That difference in origin still shapes what each tool is best at in 2026, more than any single feature does. Here is what each one costs, what the free tier actually gives you, and which job each is built to do well, based on both companies' published pricing as of mid 2026.
What each tool is actually for
Grammarly's job is to leave your sentence structure alone and fix what is wrong with it: agreement errors, misplaced commas, phrasing that reads awkward, tone that lands colder or warmer than you intended. It suggests changes; you keep the shape of what you wrote.
QuillBot's job is to hand you a different sentence entirely. Feed its Paraphraser a passage and it returns a reworded version, tunable across modes like Formal, Academic, Shorten, or Expand. The tool is less about catching mistakes and more about generating options for you to choose between.
Grammarly in 2026: coverage and correctness
Grammarly's free plan checks spelling, grammar, and punctuation on text of any length, with no cap, plus basic tone detection and a small monthly allowance of AI prompts. Pro costs $12 a month billed annually (about $144 a year) or $30 billed monthly, per Grammarly's published pricing, and adds full-sentence rewrites, one-click tone adjustment, a plagiarism checker that cross-references more than 16 billion web pages and academic databases, AI-content detection, and 2,000 AI prompts a month. Team features and up to 149 seats are now bundled into that same Pro tier, which used to be split into separate Premium and Business plans.
The strength here is reach. Grammarly lives in the browser, the desktop app, Word, and the mobile keyboard, so it edits wherever you already work: email, docs, forms, chat. It is the tool most likely to be quietly running in the background while you write something else entirely. What it does not do particularly well is generate alternate phrasings; suggestions stay close to your original sentence rather than reworking it wholesale.
QuillBot in 2026: the paraphrase-first suite
QuillBot's free plan lets you paraphrase up to 125 words at a time, in Standard or Fluency mode only, with no daily cap on how many times you run it. That word limit is tight, close to one paragraph, so free use suits a sentence or two at a time rather than a full draft. The free tier also includes a Grammar Checker with a daily limit on checks, a full AI Detector, a Summarizer capped at 1,200 words, a citation generator, and a translator, all usable with no account for basic use.
Premium costs $8.33 a month billed annually ($99.95 a year), $13.31 a month on the semi-annual plan, or $19.95 billed monthly, per QuillBot's own pricing page. It removes the 125-word ceiling, unlocks all nine paraphrasing modes (Standard, Fluency, Formal, Academic, Simple, Creative, Shorten, Expand, and Custom), and adds a plagiarism checker plus the AI Humanizer, which rewrites stiff or AI-generated text to read more naturally.
The strength here is optionality. Where Grammarly nudges your existing sentence, QuillBot hands you several fully rewritten versions and lets you pick the one that fits. That is genuinely useful for a paragraph that has no actual errors but still reads badly, which is a problem a correctness checker was never built to solve.
QuillBot also bundles a translator, a summarizer, and a citation generator into the same subscription, tools Grammarly does not offer at all. If any of those already sit in your workflow, that bundling is worth factoring into the price comparison, since you are not just buying a paraphraser.
Side by side
| Grammarly | QuillBot | |
|---|---|---|
| Entry price, mid 2026 | Free plan; Pro $12/mo billed annually | Free plan; Premium $8.33/mo billed annually |
| Free tier limit | Unlimited length, correctness only | 125 words per paraphrase, 2 of 9 modes |
| Core skill | In-place correction and tone | Full paraphrase across 9 modes |
| Plagiarism checker | Included in Pro | Included in Premium |
| Where it lives | Browser, desktop app, Word, mobile keyboard | Web app, browser extension, Word add-in |
| Best for | Editing text you already wrote, everywhere you type | Rewriting a stuck paragraph, academic rewording |
Which one actually solves your problem
Prices and feature lists shift, so anchor on the job instead:
- If your problem is typos and awkward phrasing in things you are already writing, emails, docs, reports, Grammarly's everywhere coverage is the better fit, and the free plan alone catches most of it.
- If your problem is a paragraph that is technically correct but will not sound right, or you need to reword something for originality, QuillBot's paraphraser is built for exactly that. Budget for Premium if you use it often; the free 125-word cap gets restrictive fast.
- Neither tool substitutes for the other's core job. Grammarly's rewrite feature is a bonus bolted onto a correction engine. QuillBot's grammar checker is a bonus bolted onto a paraphrasing engine. If you genuinely need both jobs done well, plan on two tools rather than expecting one to cover the other.
- Do not pay for plagiarism checking twice. Both paid plans now include one, and there is rarely a reason to run the same document through both.
There is a fifth case worth naming on its own: a sentence that is grammatically correct and cleanly paraphrased but still forty words long with three subordinate clauses. Neither tool is built to catch that, because it is a readability problem, not a correctness or originality one, and it is worth checking separately before you assume a subscription to either service solves it.
One more thing worth knowing before you paste anything in: both tools process your text on their own servers, so check each company's retention policy before running client work or unpublished drafts through either one.
Frequently asked questions
Is QuillBot cheaper than Grammarly?
On paper, yes. QuillBot Premium's annual plan works out to $8.33 a month versus Grammarly Pro's $12 a month, both billed annually as of mid 2026. They are not solving the same problem though, so the cheaper tool is not automatically the better value for your specific use.
Can QuillBot replace Grammarly?
Partially. QuillBot's free Grammar Checker catches basic errors, but it was not built to be the everywhere-you-type correctness layer that Grammarly is. If you need editing running in your inbox, browser, and Word at the same time, that coverage is hard to replace with a paraphrasing tool.
Does Grammarly have a paraphrasing tool like QuillBot's?
Grammarly Pro includes full-sentence rewrites, but it offers one reworded version per suggestion rather than QuillBot's nine selectable modes. If you want several different phrasings to choose between, QuillBot's Paraphraser goes deeper.
Is QuillBot's free plan actually usable?
For short bursts, yes: paraphrases in Standard or Fluency mode are unlimited in number. The catch is the 125-word cap per run, which covers about a paragraph, so anything longer needs to be broken into chunks or run through Premium.
Before paying for either one, see what the free math says about your own draft: paste a page into our free readability checker and you will know in ten seconds whether your problem is really grammar, phrasing, or sentences that just run too long.