GPTinf

What is GPTinf?

GPTinf is a browser-based AI writing toolkit whose main product is a text humaniser: it rewrites AI-generated drafts so they read more like human prose and score lower on AI detectors. Alongside the humaniser, the site offers an AI detector, a paraphrasing tool, a plagiarism checker, a grammar checker, a readability checker and an essay writer. The company says its detector cross-checks text against eight detection systems, and it claims an average AI score below 5% after humanisation, figures we could not test independently.

GPTinf was founded in 2023 in Lviv, Ukraine, and its About page says it was released publicly in April 2023 as a personal project by its founder and CEO, Artur Z. The company reports a team of more than 10 people and over 500,000 monthly visitors, and it rebranded with a new website in May 2025 before launching its AI detector in August 2025. Payments run through Paddle. Because tools in this category are often marketed for avoiding AI detection, GPTinf publishes a Responsible Use Policy that prohibits academic cheating and deceiving institutions about authorship, and the tool was live when we checked in October 2026.

Key Features

• AI text humaniser: GPTinf’s humaniser rebuilds sentence rhythm and word choice in AI-written drafts so the text reads less mechanically. The company says it targets the signals detectors scan, and paid plans set monthly humaniser word allowances.
• Eight rewrite modes: GPTinf offers eight writing modes, which reviewers list as Standard, Academic, Simple, Formal, Informal, Expand, Shorten and Creative. Each mode changes tone or length, so one draft can be adapted for an essay, a blog post or a short summary.
• Freeze list for key terms: GPTinf lets you freeze chosen words so the rewrite leaves them untouched. This protects names, technical terms, citations and SEO keywords that would otherwise be swapped for synonyms during paraphrasing.
• Multi-detector AI checker: GPTinf’s AI detector cross-checks text against eight detection systems and highlights results at segment level, according to the company. Seeing where detectors disagree is useful, because a single percentage rarely tells the whole story.
• Paraphraser and essay writer: GPTinf includes a separate paraphrasing tool and an AI essay writer alongside the humaniser. Paid plans give the paraphraser half the word allowance of the humaniser, for example 2,500 words on Lite.
• Plagiarism, grammar and readability checks: GPTinf bundles a plagiarism checker, grammar checker and readability checker in the same account. Every paid plan lists unlimited plagiarism and grammar checks, which saves switching between separate services during editing.
• File uploads and history: GPTinf accepts document uploads up to each plan’s word cap, from 5,000 words on Lite to no cap on Unlimited. The company says it keeps an encrypted copy of past rewrites in a personal History dashboard.

Pros

• Several tools in one account: GPTinf combines humanising, detection, paraphrasing, plagiarism, grammar and readability checks in one interface. That reduces copying text between services, which diyai.io also notes as a practical benefit of the bundle.
• Low entry price: GPTinf lists its Lite plan at $4.99 per month on the official pricing page. That is cheaper than many writing assistants, although third-party reviews report that monthly billing costs more than the headline rate.
• Free testing without sign-up: GPTinf lets you humanise 120 words without an account and another 120 after registering. The AI detector is also free, so you can judge the output quality before paying.
• Control over terminology: GPTinf’s freeze list keeps protected words unchanged during a rewrite. Reviewers single this out because it stops the tool altering names, quotations and keywords that must stay exact.
• Monthly plans you can cancel: GPTinf says all plans run month to month and can be cancelled or switched in two clicks. Remaining words stay available until the end of the billing period, according to the pricing page.

Cons

• Academic integrity and policy risk: GPTinf is marketed around lowering AI detection scores, which can conflict with school, university and employer rules on AI use. Submitting humanised AI text as your own work may breach those policies regardless of any detector result.
• Meaning can drift: GPTinf rewrites can change nuance or introduce errors while lowering detector scores, according to diyai.io and toolsforhumans.ai. You need to reread every output against the original, which adds editing time.
• Detector results vary: GPTinf’s own detector, like others, can give different scores for the same text, and one Trustpilot reviewer reported a handwritten text flagged as 76% AI. Treat any percentage as a rough signal, not proof of authorship.
• Billing and support complaints: GPTinf holds a 4.2 TrustScore from 27 Trustpilot reviews, but several reviewers report annual plans whose word count did not reset and slow replies from support. Check the billing terms before choosing a yearly plan.
• Unclear monthly price: GPTinf’s pricing page shows $4.99, $12.49 and $29.99, while diyai.io and toolsforhumans.ai report $9.99, $24.99 and $59.99 for monthly billing. Confirm the final checkout figure before subscribing.
• Text may pass through other services: GPTinf’s multi-detector scan can send your text to outside detection systems, diyai.io warns. Avoid pasting personal data, client documents or other confidential material into the tool.

Who is Using GPTinf?

• Students: Checking drafts and grammar within their institution’s AI rules.
• Educators: Screening submitted work with the free AI detector.
• Content writers: Smoothing stiff AI-assisted drafts for blogs and web pages.
• SEO marketers: Rewording copy while freezing target keywords.

Pricing

GPTinf is freemium, with a small free allowance and three paid plans listed from $4.99 to $29.99 per month (official prices, October 2026).

The official page also advertises a 50% saving on yearly billing, and diyai.io and toolsforhumans.ai report monthly-billing prices of $9.99, $24.99 and $59.99, with the lower figures as annual equivalents.

Prices and word allowances can change at checkout, so confirm the current figures on GPTinf’s own pricing page before you pay.

What Makes GPTinf Unique?

GPTinf pairs its humaniser with a detector that compares results from eight systems, so you see where detectors disagree instead of relying on one score. The freeze list, eight rewrite modes and bundled plagiarism, grammar and readability checks make it a full editing workspace rather than a single rewriter. It also publishes a Responsible Use Policy that asks users to disclose AI involvement and follow their institution’s rules, which few rivals state so plainly.

Compatibilities and Integrations

• Platforms: Runs in any modern web browser with no software to install.
• File uploads: Accepts document uploads up to each plan’s word limit.
• API: toolsforhumans.ai mentions API and bulk processing, but the official site does not document a public API.
• Payments and data: Payments run through Paddle, and past rewrites are stored in an encrypted History dashboard.

GPTinf Tutorials

Getting started takes a few minutes, and the steps below focus on editing quality and staying within the rules that apply to you.

1. Read your school, employer or client policy on AI writing tools before using GPTinf for any assessed or contracted work.
2. Open gptinf.com, paste a short sample into the humaniser and try the free 120-word allowance without signing up.
3. Pick a rewrite mode such as Academic or Formal, and add names, citations or keywords to the freeze list.
4. Compare the output line by line with your original and correct any change in meaning, facts or references.
5. Run the grammar and plagiarism checks, then disclose AI assistance wherever your institution or client requires it.

How We Rated It

Summary

GPTinf suits writers and content teams who want to polish stiff AI-assisted drafts and check grammar, plagiarism and readability in one place. Its biggest limitation is that it is built around lowering detector scores, which carries real academic integrity and policy risk, and rewrites can still drift in meaning. Billing complaints and unclear monthly prices are also worth weighing before you commit. Our tip is to test the free allowance on a non-assessed sample and always confirm your institution’s AI rules first.