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About GPTinf
GPTinf is an all-in-one AI writing toolkit designed to help you turn AI-generated drafts into clean, human-sounding text ready for submission or publication. It combines six tools in one platform: AI Humanizer, AI Detector, Plagiarism Checker, Paraphraser, Readability Checker, and Grammar Checker. The core problem it solves is 'AI detection' — many schools, workplaces, and publishers now use AI-detection tools, and GPTinf helps you reduce the AI score while preserving meaning, tone, and accuracy.
Who is it for?
GPTinf is best for students, freelancers, content marketers, ESL writers, and business professionals who rely on AI writing assistants but need the output to pass as human-written. It's also useful for anyone who wants to ensure their content is original, readable, and free of grammar errors. It is NOT for those who need advanced plagiarism-source tracing beyond URL matches, or those looking for a full grammar assistant with style suggestions (it focuses on errors, not style).
Real-world use cases
In practice, GPTinf is used to humanize academic essays before submission (to reduce Turnitin flags), to clean up AI-written blog posts and marketing copy, to rephrase research summaries, and to check for AI involvement in submitted work. The built-in AI Detector checks against 8 systems with segment-level color coding, while the Plagiarism Checker gives a percentage and flags matched sources.
Plans and free trial
GPTinf offers a free trial — you can humanize up to 120 words without signing up, and another 120 words after creating a free account (240 total). Paid plans start at $4.99/month (Lite), with Pro at $12.49/month and Unlimited at $29.99/month (billed yearly; monthly prices are higher). All paid plans include 'Ultra Humanization' and unlimited AI detector checks, with higher tiers offering more words and priority support.
Key features
- AI Humanizer — Rewrites AI text to bypass detection, with 8 writing modes and 'Freeze Keywords' to lock important terms.
- AI Detector — Cross-checks your text against 8 AI-detection systems, giving per-system results and segment-level colors.
- Plagiarism Checker — Shows plagiarism percentage, flags matched sentences, and traces each match to its URL.
- Paraphraser — Rephrases content while preserving meaning, with optional selective rephrasing and word locking.
- Readability Checker — Instantly shows Flesch-Kincaid score and highlights hard-to-read spots for audience adjustment.
- Grammar Checker — Catches contextual spelling and grammar errors with click-to-fix functionality.
SaaSpartout Score
6.9
/10
Editorial score from our review methodology — not user ratings.
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GPTinf Pricing
GPTinf pricing: from $4.99/mo.
For comparison: the median starting price in AI Writing is $15/month, measured across 92 tools we track. See the full SaaS Pricing Index →
Free Trial
Humanize up to 120 words without an account, plus another 120 after free signup (240 total). See your AI score drop to 0% before paying.
Lite — $4.99/monthly
For quick rewrites & small tasks. Includes 5,000 humanizer words, 2,500 paraphraser words, unlimited plagiarism checks, unlimited grammar checks, unlimited freeze keywords, unlimited AI detector checks, built-in AI detector, all rewrite modes, and unlimited re-humanizing and selective rephrase.
Pro — $12.49/monthly (most popular)
Best for articles or longer content. Includes 25,000 humanizer words, 12,500 paraphraser words, plus all Lite features, unlimited re-humanizing and selective rephrase, priority email support.
Unlimited — $29.99/monthly
Everything unlocked with no limits. Includes unlimited humanizer and paraphraser words, unlimited plagiarism, grammar, re-humanizing, selective rephrase, freeze keywords, AI detector checks, top-tier customer support, and first access to new features.
Frequently asked questions
Is GPTinf free?
GPTinf offers a limited free trial: you can humanize up to 120 words without signing up, and another 120 words after creating a free account (240 total). After that, paid plans start at $4.99/month.
How much does GPTinf cost?
Paid plans are $4.99/month (Lite), $12.49/month (Pro), and $29.99/month (Unlimited) when billed yearly. Monthly billing is available at higher rates. All plans include unlimited AI detector checks.
What is GPTinf used for?
GPTinf is an AI writing toolkit that humanizes AI-generated text to avoid AI detection, checks for plagiarism and readability, and fixes grammar errors. It's used by students, freelancers, and marketers to make AI content sound natural and original.
Can GPTinf bypass Turnitin?
GPTinf's humanizer is designed to reduce AI detection scores across major detectors, including Turnitin. The company claims an average AI score of <5% after humanization, but no tool can guarantee 100% bypass on every system or update.
What are the best alternatives to GPTinf?
Popular alternatives include Undetectable AI, StealthGPT, and QuillBot. Each has different strengths; GPTinf stands out for its multi-tool suite (humanizer, detector, plagiarism, grammar, readability) and affordable entry price.
Who is GPTinf best for?
GPTinf is best for students, freelancers, and content creators who use AI writing tools and need to ensure their output passes AI detection, is original, and is well-written. It's also useful for educators and employers who want to check submitted work for AI involvement.
