DetectGPT
A free, no-account AI content detector for students, writers, and teachers that checks up to 3,000 words per run.
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DetectGPT.io is the right pick for anyone who needs a fast, zero-friction AI check without handing over an email address. Its free-forever model and URL-scanning feature are real differentiators, but the 3,000-word cap per run and English-first accuracy mean it falls short for bulk or multilingual work. If you need higher volume, passage-level confidence scores, or a proven accuracy track record, AnyAIZero is a closer match within our directory.
What is DetectGPT?
DetectGPT (detectgpt.io), built by CoreAI LLC, is a free web-based AI content detector that requires no account or login to use. Users paste up to 3,000 words of text or enter a public page URL, and the tool returns an AI-likelihood percentage with highlighted passages identifying which sections appear machine-generated. It covers output from ChatGPT, Claude, Grok, Gemini, and related models.
Alongside the core detector, the platform includes a plagiarism and similarity checker, a humanizer tool for rewriting flagged text, and shareable result links. The tool is aimed at students, writers, teachers, and marketers who need a quick authenticity check on short drafts. It is strongest on English-language content and is operated independently, with no affiliation to Turnitin or other institutional platforms.
How we scored DetectGPT
Ease of use is the tool's genuine strength: no account, no cap stated, paste-and-go with URL scanning is a real convenience advantage that earns a high sub-score there. Value scores modestly well because the core product is free, though the paywalled humanizer status is unconfirmed. Capability is held back by the hard 3,000-word per-run limit, no published accuracy benchmark, and no multi-dimension analysis that directory competitor AnyAIZero provides. Delivery scores very low: the pricing page is a 404, the humanizer's free status cannot be verified, the tool markets itself as free while leaving a key feature's cost opaque, and third-party reviewers testing comparable zero-shot detection methods have found accuracy far below vendor claims. A tool whose own pricing page does not load and whose accuracy is unsubstantiated cannot score well on delivery.
Pros and cons
What we liked
- Genuinely free with no account required and no stated daily cap on checks, making it the lowest-friction entry point in the AI detection category.
- URL-based scanning lets you check a live public page without copy-pasting, a feature absent from most free-tier detectors.
- Bundles a plagiarism checker and humanizer alongside detection, so a writer can check, flag, and rewrite in one place without switching tools.
Where it falls short
- The 3,000-word per-run cap means any document over roughly six double-spaced pages must be split across multiple checks, with no built-in way to aggregate the scores into a single report.
- The pricing page returned a 404 at time of review, making it impossible to confirm exactly what the humanizer tool costs or whether any features are paywalled, which is a transparency problem for a tool marketing itself as free.
- No published independent accuracy benchmark: the site claims to detect output from major models but does not cite test data, and third-party reviewers testing similar zero-shot detection methods have found accuracy rates that vary widely from vendor claims.
Key features
Who should use DetectGPT?
A student submitting a draft who wants a sanity check before turning it in will find DetectGPT.io genuinely useful: no login, no waiting for a trial email, paste and go. Teachers who want to share a flagged result with a student can use the shareable link without setting up a classroom account. Freelance writers checking their own work for accidental AI-sounding phrasing get the same zero-friction experience.
Anyone who needs to process documents longer than 3,000 words in a single pass, work consistently in languages other than English, or produce results defensible enough for an academic integrity hearing should look elsewhere. AnyAIZero, already in our directory, offers transparent multi-dimension analysis and is worth comparing directly for users who need more than a percentage score.
Skip it if: Anyone processing long documents, non-English text at scale, or needing audit-grade accuracy
DetectGPT alternatives
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Frequently asked questions
Is DetectGPT.io actually free, or is there a hidden paywall?+
The site's own schema data lists the price as $0 USD and the homepage states no account is needed. However, the pricing page returned a 404 at time of review, so whether the humanizer tool is fully free or partially paywalled could not be independently confirmed.
What is the word limit per check?+
The tool accepts up to 3,000 words per run. Longer documents must be split into multiple pastes, and there is no built-in feature to combine the resulting scores into a single report.
Is this the same DetectGPT as the one that charges $15 a month?+
No. DetectGPT.io (CoreAI LLC) is a separate business from detectgpt.com, which is a paid SaaS product with tiers starting at $15 per month. The two share a brand name but are unrelated companies.
Which AI models does it detect?+
The site lists ChatGPT, GPT-5, Claude, Grok, and Gemini as supported models. It is strongest on English-language text.
Can a teacher share results with a student?+
Yes. Each completed scan generates a shareable link. The recipient does not need an account to view the result.
How accurate is it?+
DetectGPT.io does not publish an independent accuracy benchmark. Third-party reviewers testing zero-shot AI detection methods in this category have found significant gaps between vendor accuracy claims and measured performance, so treat any single score as a signal rather than a verdict.
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