Last updated 08-10-2026
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GPTinf
GPTinf bundles six writing utilities on one site: an AI detector, humanizer, plagiarism checker, paraphraser, readability scorer, and grammar checker. You can paste or upload text, run detection across eight systems with segment-level highlights, then rewrite in one of eight humanizer modes while locking terms with Freeze. The platform markets itself to students, freelancers, and marketers who need drafts cleaned before submission or publishing.
Most humanizers only shuffle words at the surface. GPTinf contrasts its Steel engine with lighter LLM rephrasing by rebuilding sentence rhythm and targeting signals detectors scan, while its Feather-style approach is described as leaving patterns exposed. Published stats claim under 5% average AI scores after humanization and 37% better detection results than unnamed competitors, with 15 billion plus words processed.
Paid tiers cap humanizer and paraphraser word counts, but the AI detector stays free with unlimited checks on every plan. Lite starts at $4.99 per month for 5,000 humanizer words, Pro raises quotas to 25,000 words, and Unlimited removes caps entirely. Readability scoring uses Flesch-Kincaid levels, and plagiarism hits link back to matched URLs for manual review.
AI Detector runs eight cross-check systems with segment-level color review
Humanizer offers eight rewrite modes plus Freeze keyword locking
Lite plan costs $4.99 per month for 5,000 humanizer words
Plagiarism Checker reports a percentage and links flagged sentences to source URLs
Readability Checker scores copy on Flesch-Kincaid reading level
Platform reports 15 billion plus words humanized across users
Six writing tools share one workflow from detection through grammar fixes.
Free unlimited AI detector checks across eight systems on every tier.
Freeze keyword locking keeps names, citations, and brand terms intact during rewrites.
Plagiarism results trace flagged sentences to their source URLs.
Eight humanizer modes let you tune output style before submission.
Lite and Pro plans cap humanizer and paraphraser word counts each month.
Full humanizer access requires a paid subscription beyond the free detector.
Marketing claims about bypassing detectors may not match every institution's policies.
What tools does GPTinf include?
GPTinf combines six utilities on one site: an AI detector, humanizer, plagiarism checker, paraphraser, readability scorer, and grammar checker. You can paste or upload text and move between checks without leaving the dashboard.
Is GPTinf free to use?
GPTinf offers a free tier with unlimited AI detector checks across eight systems. Humanizer and paraphraser usage requires a paid plan, with Lite starting at $4.99 per month for 5,000 humanizer words.
How much does GPTinf Pro cost?
GPTinf Pro is $12.49 per month on monthly billing and includes 25,000 humanizer words and 12,500 paraphraser words. The plan also adds priority email support plus unlimited plagiarism, grammar, and detector checks.
Does GPTinf humanize text for Turnitin?
GPTinf markets humanization for academic submissions and claims average post-humanization AI scores under 5%. The site highlights checking essays before Turnitin-style detectors, but results depend on your text and the detector used.
What is GPTinf Freeze?
GPTinf Freeze lets you lock specific keywords, names, citations, or brand terms during humanization or paraphrasing. Locked terms stay unchanged while the surrounding text is rewritten in your chosen mode.
Can I cancel GPTinf anytime?
GPTinf states on its pricing page that you can cancel or downgrade at any time. Paid plans bill monthly or yearly, with yearly billing advertised as saving 50% compared to monthly rates.