AI paraphrasing tools
We put 6 AI paraphrasing tools through the same test. Ahrefs Paraphrasing Tool came out on top with 5 out of 5. Here are all the results, what each tool costs and how we test them.
AI paraphrasing tools we tested
Best score first. Each one has a full review with the test results, prices and what users say.
Ahrefs Paraphrasing Tool
5/5Read our review →
QuillBot
4/5Read our review →
Wordtune
3/5Read our review →
ReWrite It.AI
3/5Read our review →
Paraphraser.io
2.5/5Read our review →
Spinbot
2/5Read our review →Test results compared
Every tool got the same test, between October 21, 2026 to October 27, 2026.
| Tool | Score | Correct and complete answers out of 30, checked against a written answer key | Factual errors found per 1,000 words | Blind quality score (1–5) from three judges who don't know which tool wrote what | Time to a usable answer, including retries | Cost per month for one person and for a team of five |
|---|---|---|---|---|---|---|
| Ahrefs Paraphrasing Tool | 5/5 | Meanings preserved: 20/20 | 0.1 errors/1,000 words | 5.0/5; three blind judges | – | – |
| QuillBot | 4/5 | Meanings preserved: 16/20 | 1.1 errors/1,000 words | 4.0/5; three blind judges | – | – |
| Wordtune | 3/5 | Meanings preserved: 14/20 | 2.7 errors/1,000 words | 2.9/5; three blind judges | – | – |
| ReWrite It.AI | 3/5 | Meanings preserved: 14/20 | 2.3 errors/1,000 words | 2.6/5; three blind judges | – | – |
| Paraphraser.io | 2.5/5 | Meanings preserved: 14/20 | 2.7 errors/1,000 words | 2.1/5; three blind judges | – | – |
| Spinbot | 2/5 | Meanings preserved: 11/20 | 3.9 errors/1,000 words | 2.0/5; three blind judges | – | – |
Want just the shortlist?
Our best-of list ranks every tool in this test, with what each one is best for.
What AI paraphrasing tools do
AI paraphrasing tools rewrite a passage in different words while trying to keep the meaning. Some work on whole texts in selectable modes, others suggest sentence rewrites inside an editor, and older spinners swap words in bulk. Most also bundle grammar, summary or plagiarism checks.
Who uses them: Students rewording notes and drafts, Non-native English writers, Content marketers repurposing copy, Professionals polishing emails, SEO writers refreshing existing text.
Price range: Four of the five have a free tier. Paid prices published: QuillBot Premium 19.95 monthly or 8.33 a month yearly; Wordtune Advanced 6.99 or 4.89 yearly and Unlimited 9.99 or 6.99 yearly; Paraphraser.io weekly plans from 4.55 a week, Gold 9.55 a month, Diamond 47.52 a year (homepage). Spinbot premium reportedly 9.95 a month. Ahrefs' tool is free with a free account; its platform plans start at 29 a month and are unrelated.
What to check before you buy
Meaning preservation. Roundups rate this first; paraphrasers can drift from facts, so test with technical and legal text.
Free plan limits. Caps differ: QuillBot 125 words per run, Wordtune 10 rewrites a day, Ahrefs 2,048 characters, Paraphraser.io 400 to 600 words, Spinbot unconfirmed.
Modes and control. QuillBot has 9+ modes on Premium, Paraphraser.io lists 14, Ahrefs shows one tone; more control helps match voice.
Languages. Wordtune and Ahrefs are English only; Paraphraser.io lists 22; QuillBot reportedly 30+.
Privacy and data use. Wordtune's policy allows use of text to improve AI21 products; Paraphraser.io's policy is silent; QuillBot, Spinbot and Ahrefs policies could not be read.
How we test AI paraphrasing tools
The test for this category: 20 passages: meaning kept (checked by judges), readability, and plagiarism score of the output.
Every tool gets the same fixed prompt set: 30 everyday tasks (summaries, emails, research questions, rewrites, long-form drafts). Prompts are copied in exactly, on the plan most buyers would pick, with no custom instructions.
Each tool is tested on a paid plan, and its review shows the plan, the price and the test dates. The overall score is the average of the five parts on the right, rounded to the nearest half star. See the full method for AI chat and writing tools.
What we measure
- Correct and complete answers out of 30, checked against a written answer key
- Factual errors found per 1,000 words
- Blind quality score (1–5) from three judges who don't know which tool wrote what
- Time to a usable answer, including retries
- Cost per month for one person and for a team of five
The five parts of the score
Frequently asked questions
What is the best free AI paraphrasing tool?
QuillBot free allows 125 words and 2 modes; Wordtune 10 rewrites a day; Ahrefs 2,048 characters with a free account; Paraphraser.io 400 to 600 words; Scribbr is free with no signup in a June 2026 roundup.
What is the difference between paraphrasing and spinning?
Spinners swap words in bulk and often hurt readability; paraphrasers aim to keep meaning and flow. A Spinbot Trustpilot reviewer found output hard to follow.
Is paraphrasing plagiarism?
Rewording another person's work without credit can still count as plagiarism; Paraphraser.io claims otherwise on its homepage, which we treat as marketing. Check your school's policy.
Do paraphrasing tools get past AI detectors?
The fast.io roundup checked output with Originality.ai but no controlled benchmark was found; results vary by tool and mode.
Which tool has the best refund policy?
QuillBot 3 days on first purchase, Paraphraser.io 10 days on monthly plans if mostly unused, Wordtune says no refunds, Ahrefs generally no refunds on platform plans.
More in AI writing tools
Page updated November 4, 2026.
Liam Foster
If there's a strange new AI tool making its way around the internet, I've probably already bookmarked it. My favorite part is figuring out what these platforms can actually do.
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