AI Humanizer Detector Checker
Rephrasy · Writing · AI Detection
Rephrasy is an AI humanizer and AI detector that rewrites ChatGPT, Claude or Gemini text so it reads like human writing and scores the result against Turnitin, GPTZero and Copyleaks.
About AI Humanizer Detector Checker
What Is Rephrasy
Rephrasy is a web app that takes AI-generated text and rewrites it so the sentence rhythm, word choice and paragraph flow look like something a person typed. It works as an AI to human text converter: paste a draft, pick a model, get a version that reads like a human wrote it. A detector sits on the same screen, so you can score the output and run it again if the number stays high.
The product targets two crowds. One is students who drafted an essay with ChatGPT and want it to survive a submission check. The other is content teams that use AI for first drafts and need the copy to clear an editor's AI scan. A limited free run lets you see the output before you pay.
Three limits matter. Output depends on the model you pick: v4 for general text, superstealth for the highest bypass rate, ft_clean-v3 for technical copy with figures. A single run caps at 2,000 words, so a long thesis gets split. And the score you see inside Rephrasy comes from Rephrasy's own detector, which isn't the same engine Turnitin runs on a campus account.
Getting Started
- Open rephrasy.ai and paste text into the box, or upload a file. Pick the source if you want, ChatGPT, Claude or Gemini. The tool detects it either way.
- Choose a humanizer model or a saved writing style. v4 is the default and handles most drafts. Superstealth takes longer and pushes harder on detectors.
- Click Humanize and wait. Superstealth runs take 10 to 60 seconds, so give the tab a minute.
- Check the AI score with the built-in detector. If the number is still high, re-humanize the same text at no extra cost on a paid plan.
- Copy the output, or send it through the plagiarism checker if you have credits left.
Product Information
A quick look at AI Humanizer Detector Checker's pricing, supported platforms, and performance.
Best for
The users, tasks, and scenarios where this tool fits best.
Users
- Students working on essays and dissertations
- Content marketers and SEO writers
- Non-native English writers
Tasks
- Cleaning up a ChatGPT draft before an editor sees it
- Checking a document you wrote yourself
- Rewriting technical copy full of numbers
- Processing hundreds of pages at once
Scenarios
- A deadline the night before submission
- An agency producing multilingual landing pages
- Running a client blog on a schedule
Key features
AI Humanizer With Selectable Models
You can humanize AI text from ChatGPT, Claude, Gemini, DeepSeek or Grok with five models behind one button. v4 is the balanced default, superstealth chases the highest bypass rate and takes 10 to 60 seconds, ft_clean-v3 keeps meaning and length close to the source, and the Undetectable and SEO models target academic and marketing text. You pick per document, so a thesis and a product page don't get the same treatment.
Built-in AI Detector
Every humanized draft can be scored in the same window. The detector reports a likelihood percentage and also works on text you wrote yourself, which makes it useful for spot checks. Rephrasy says its scores come from fine-tuned models trained the way GPTZero, Copyleaks and Turnitin train theirs, and detector use is free.
Writing Style Cloning
You feed the tool samples of your own writing and save the result as a style. After that, the humanizer rewrites in that voice instead of a generic one. Growth includes one style, Business three, Professional ten. Agencies use it to keep each client's tone separate.
Chrome Extension
The extension puts humanize and detect buttons inside Google Docs, Gmail, LinkedIn and other web editors. You don't have to copy text into a separate tab, which saves a step on short pieces like emails and social posts.
Humanizer API and MCP Server
Business and Professional plans include API access, priced from $0.10 per 1K words with flat or word-based billing. A POST request returns the rewritten text plus a readability score. An MCP server lets Claude, ChatGPT or Cursor call the same tools as a connector, and input can be plain text, HTML or Markdown with structure preserved.
Plagiarism Checker
Credits on each plan buy scans that compare text against web and academic sources. The Quick Pass bundles 20 credits, and higher tiers add more through support. It's a separate check from AI detection, and you want both before publishing anything that goes through a review process.
Pros and cons
Pros
- Humanizer and AI detector share one screen, so you can rewrite, score and rewrite again without moving files around.
- Model choice gives you a real trade-off between speed, meaning retention and bypass rate instead of one fixed output.
- The API starts at $0.10 per 1K words and ships with an MCP server, which is cheap next to most writing APIs.
- 50+ languages are rewritten in place, so a Spanish or Japanese draft stays in its own language.
- The $14.99 24-hour pass covers a one-off deadline without a recurring charge.
Cons
- The 2,000-word cap per run means long documents get split, and you reassemble them by hand.
- Bypass rates are measured against Rephrasy's own detector. Turnitin and GPTZero retrain their models, so a good score inside the app doesn't guarantee the same result on a campus account.
- Monthly plans count humanizations, not words, so 100 runs on Growth disappear fast if you work in short pieces.
- Style cloning is limited to one slot on Growth, which is tight for a freelancer juggling several clients.
Frequently asked questions
It rewrites AI-generated text so it reads like human writing, then scores the result with a built-in detector. You paste a draft, pick a model, and get a new version plus an AI likelihood percentage.
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