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What is GPTinf? Tools, plans, and what it can do for you

James
Updated

Quick answer: GPTinf is an all-in-one writing toolkit. Four live tools — AI Humanizer, AI Detector, Plagiarism Checker, Grammar Checker — plus account, billing, and an affiliate program, in one platform.

GPTinf home page with the AI Humanizer open as the default tool. The left sidebar lists the suite — AI Detector, Humanizer, Paraphraser, Plagiarism, Readability Checker, Grammar, and Essay. The four live tools today are AI Humanizer, AI Detector, Plagiarism Checker, and Grammar Checker; Paraphraser and Readability Checker are coming soon.

What you get

  • AI Humanizer. Rewrites AI-generated text so it reads in a more natural human voice. Eight modes (Standard, Academic, Formal, Informal, Simple, Expand, Shorten, Creative).
  • AI Detector. Free and unlimited. Cross-checks your text against 8 detectors (Turnitin, Originality.ai, Crossplag, Gowinston.ai, Copyleaks, GPTZero, Sapling.ai, ZeroGPT) and gives one combined view.
  • Plagiarism Checker. Scans your text against the web, returns matched sources with sentence-level attribution.
  • Grammar Checker. Real-time grammar, spelling, and punctuation correction. Runs on a self-hosted engine — your text does not pass through a third-party server.

Is it free?

Yes — there is a free tier you can use without paying. Two flavors:

  • Anonymous: 120 words per humanizer cycle. No account needed.
  • Registered free: 120 words per cycle plus freeze keywords. Same price (free).

The AI Detector is free and unlimited for everyone.

Paid plans start at $9.99/mo (Lite) and unlock larger monthly word budgets plus features like selective rephrase, re-humanize, and Fix All Errors.

Pricing cards side by side — Lite $9.99/mo, Pro $24.99/mo (marked "Most popular"), Unlimited $59.99/mo — each with its humanizer word allowance and an at-a-glance feature list.

How it is different from a single humanizer

Most humanizers are single-purpose: paste text, get rewritten text. GPTinf bundles humanizing with detection, plagiarism checking, and grammar — so you do not ship work, run it through another tool, then come back to fix things. One workflow, one subscription.

Note: Paraphraser and Readability Checker are in development. They will join the toolkit once they are live.

FAQ

Do I need an account to try it? No. The Humanizer and AI Detector both work without signup. Creating a free account unlocks freeze keywords.

Will my text be stored or used to train models? See How GPTinf handles your content. Short version: the grammar engine is self-hosted; humanization is private to your account.

Is GPTinf appropriate for academic work? Read GPTinf's stance on AI ethics and academic integrity before using it on graded work. The short answer is: check your institution's policy first.

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