The short answer
If you want another paraphraser, we cannot help: we do not make one, and this page does not compare them. If you want a plagiarism or AI check without QuillBot Premium, the table below gives free limits and prices. QuillBot’s AI Detector is free, so the usual reason to look elsewhere is the plagiarism checker, which is not on its free plan.
Who wrote this, and how. Plagiarism Checker Plus publishes this page and makes one of the tools on it. Ours is listed first, and the others are alphabetical. It is not a ranking. Facts about other tools come only from each maker’s own website. We did not run accuracy tests. QuillBot’s site did not open for our reader on 1 November 2026, so its facts come from the text of its pages shown in search results that day, and from our 10 October reading of its help centre.
What QuillBot offers
- Plagiarism checker. Premium only, up to 25,000 words a month. Extra words can be bought.
- AI Detector. Free for all users.
- Paraphraser. Its pages give the free limit as 100 words in one place and 125 in another. The help centre says Premium has an unlimited word count.
- Premium price. A QuillBot page lists $19.95 a month, or $99.95 a year. Its help centre says the price depends on your region.
Comparison table
Each cell is a fact from the maker’s own site. Prices are listed US dollar prices, and they change, so read the maker’s page on the day you buy.
| Tool | Free allowance | Paid price | Plagiarism check | AI detection |
|---|---|---|---|---|
| Plagiarism Checker Plus (ours) | First plagiarism check and first AI check free, up to 1,000 words each. A free account includes 3,000 words a month. | Student plan $4.99 a month, or $3.99 a month billed yearly. See pricing. | Yes. Every matching passage is linked to its source. | Yes. An overall score and a likelihood for every sentence. |
| Copyleaks | AI detector: up to 25,000 characters free. New users get free credits. The number is not stated. | Personal plan $16.99 a month, or $13.99 a month billed yearly at $167.88. | Yes. | Yes. Paid plans scan for AI and plagiarism in a single report. |
| GPTZero | 10,000 words a month and up to 10,000 characters a scan. Its plagiarism page says the free plan covers up to 10,000 words a month. Its support article lists Plagiarism Check under Premium. | The pricing page did not show readable prices for individual plans. | Yes. Its support article lists it from the Premium plan up. | Yes. Its home page describes color-coded highlights. |
| Grammarly | Free AI detector that shows a percentage. The limit is not stated. The plans page lists plagiarism detection in paid plans, not the Free plan. | Pro: $30 a month, $60 a quarter or $144 a year per member, from its help centre. Regional prices differ. | Yes, in a paid plan. It compares text with web pages and ProQuest’s academic databases. | Yes. The free tool gives a percentage. A paid AI Detector agent shows which parts may sound AI-generated. |
| Originality.ai | The pricing page describes the free plan two ways: 10,000 words (100 credits) once, and 60 credits a day for 3 scans a day. | Pro plan $14.95 a month, or $12.95 a month billed yearly at $155.40. | Yes. A scan for AI and plagiarism uses 2 credits per 100 words. | Yes. A scan uses 1 credit per 100 words. |
| Scribbr | AI Detector: unlimited free checks, up to 1,200 words each, no sign-up. The full plagiarism report is paid. | $19.95 per document up to 7,499 words, $29.95 up to 49,999 words, $39.95 for 50,000 or more. Paid per check. | Yes, paid per document. | Yes. Its page describes paragraph-level feedback. |
How to choose
- Do you need only an AI check? QuillBot’s is free, so you may not need to switch. See is it accurate?
- How many words do you check in a month? Compare that with 25,000 and with each free limit. For one long paper, a per-document price may cost less.
- Do you need sources linked? A percentage alone does not tell you what to fix.
- What happens to your text? Read the privacy policy first. We did not review other tools’ policies.
What we did not test
- Accuracy. We did not run the same text through each tool.
- Paraphrasers. This page does not cover them, or QuillBot’s other tools.
- Pages we could not open. Copyleaks, QuillBot and Scribbr did not open for our reader on 1 November 2026, so table facts for Copyleaks and Scribbr are from 10 October 2026.
We would like you to try our tool. Its limits: no paraphraser, no database of other students’ papers, no connection to a school system, and no published accuracy figure.
Sources
- QuillBot (page text seen in search results, 1 November 2026): Premium price and paraphraser plans.
- QuillBot (read 10 October 2026): plagiarism checker plans, AI Detector, Premium price.
- Copyleaks (read 10 October 2026): pricing, plagiarism checker, AI detector.
- GPTZero (read 1 November 2026): home page, pricing, plagiarism checker, free and paid plans.
- Grammarly (read 1 November 2026): plagiarism checker, AI detector, plans, Pro price.
- Originality.ai (read 1 November 2026): pricing, plagiarism checker.
- Scribbr (read 10 October 2026): plagiarism checker, AI Detector.
- Plagiarism Checker Plus: our own plagiarism checker, AI detector and pricing pages.