GPTinf
Visit websiteWriting toolkit that humanizes AI text and checks drafts for AI signals and plagiarism.
Verified Nov 2, 2026
What is GPTinf?
GPTinf bundles several text tools into one workspace: a humanizer that rewrites AI-generated drafts, a detector that scores text for AI signals, a paraphraser, a plagiarism checker, a readability checker, a grammar checker and an essay writer. You paste or upload a draft, pick the tool you need, and get results with segment-level highlighting so you can see which sentences were flagged or rewritten.
The humanizer offers eight writing modes plus a Freeze option that keeps chosen terms unchanged, and individual passages can be re-humanized instead of the whole document. The detector cross-checks text against eight systems and shows a score for each, the plagiarism checker traces matched sentences back to source URLs, and the readability checker returns a Flesch-Kincaid level with the hardest passages marked.
The AI detector is free and unlimited, and the other tools can be used without an account within free word allowances. Paid plans raise the humanizer and paraphraser limits, and the top plan removes them. Payments are handled by Paddle.
What can GPTinf do?
AI Humanizer
Rewrites AI-generated text across eight writing modes, with a Freeze option that keeps chosen terms intact.
AI Detector
Cross-checks text against eight detection systems and highlights flagged segments so you can review them individually.
Paraphraser
Rephrases pasted or uploaded text in a selected rewriting mode while locking words you want preserved.
Plagiarism Checker
Reports a plagiarism percentage and links each flagged sentence to the source URL it matches.
Grammar and Readability
Catches contextual errors for one-click fixes and returns a Flesch-Kincaid readability score with difficult passages marked.
Who is GPTinf for?
- Students
- Draft and check assignments for AI signals and plagiarism before handing them in.
- Content writers and freelancers
- Clean up AI-assisted drafts so the final copy reads naturally and passes plagiarism checks.
- Educators
- Review submitted work for signs of AI generation and copied passages.
- Marketing teams
- Adapt AI-written copy to a brand voice and verify it before publishing.
How much is GPTinf?
Official pricingLite
$4.99/mo
Pro
$12.49/mo
Unlimited
$29.99/mo
Free plan: Free, unlimited AI detection plus no-account access to the other tools with word limits.
Frequently asked questions
Is there a free version?
Yes. The AI detector is free and unlimited, and the other tools can be used without creating an account within free word limits. Paid plans raise those limits.
How much do the paid plans cost?
Lite costs $4.99 per month with 5,000 humanizer words and 2,500 paraphraser words, Pro costs $12.49 per month for 25,000 and 12,500 words, and Unlimited costs $29.99 per month with no word caps.
Is submitted text stored or used for training?
Text is processed to produce the tool output and, per the site, is not stored, shared or used for model training after the session ends.
Which detection tools is it tested against?
The humanizer and detector are tested against tools commonly used in academic and professional settings, including Turnitin and GPTZero. Results vary with how much the original text was edited.
How are payments processed?
Payments are processed through Paddle, a licensed payment provider.
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