Clever AI Detector

Clever AI Detector. The hardest AI checker to fool. 100% Free!

Q: Why is Clever AI Detector free? What's the catch?

There is no catch. CleverFiles, as a company, often launches new products for free, and only after 1-2 years introduces paid premium features. The detector is currently in beta and free to use, with no ads and no paywall.

Clever AI Detector estimates how likely a text was written by AI — ChatGPT, Gemini, Claude, or any other model. You get an honest probability score with sentence-level signals, not a fake certainty, and it takes seconds — free online, no sign-up.

Honest AI probability score
Sentence-level AI signals
Up to 10,000 words per check · unlimited runs
Free while in beta — no ads, no paywall
Check History

Your text

Words: 0 / 10,000 By checking, you agree to our Terms.

Detection result

Your AI score will appear here.

Clever AI Detector shows probability, not proof — no AI checker is 100% accurate.

Detect AI Writing with a Free AI Checker

Our 100% free AI checker estimates how likely it is that a text was written by AI, and points to the sentences that carry the strongest AI signals.

Curious how it compares? See it tested on real texts.

Benchmark · GEDE corpus

How It Scores on the GEDE Benchmark

Eight AI detectors tested on the same public benchmark (GEDE - Generative Essay Detection in Education), a corpus of student-written and LLM-generated academic essays. We use the first 150 texts of each of the five GEDE's datasets: four sets of AI-generated essays (increasing difficulty: plain AI, humanized, improved, rewritten) and one set of human-written essays used by GEDE to count false accusations. Rows ordered according to cumulative score.

Service	AI¹	Humanize	Improved	Rewrite	Average	False²	Cumulative³	Entry plan⁴	Monthly⁴
Clever AI Detector	100.0	98.7	98.7	100.0	99.3	2	99.0	Free	$0.00
Copyleaks	100.0	93.3	86.7	100.0	95.0	0	97.5	Personal	$16.99
Originality.ai	100.0	51.3	96.0	100.0	86.8	0	93.4	Pro	$14.95
Winston AI	100.0	44.7	86.0	100.0	82.7	0	91.3	Essential	$18.00
Pangram	100.0	64.0	18.0	88.0	67.5	0	83.8	Individual	$20.00
QuillBot	100.0	22.0	38.0	96.7	64.2	0	82.1	Premium	$19.95
GPTZero	92.7	73.3	1.3	7.3	43.7	0	71.8	Premium	€18.99
ZeroGPT	70.0	0.7	0.0	4.7	18.8	0	59.4	PRO	$13.99

1 · Detection score — relates to the AI, Humanize, Improved, Rewrite and Average columns (the GEDE AI, GEDE Humanize, GEDE Improved, GEDE Rewrite and GEDE Average datasets): the percentage of each dataset's AI texts that the detector correctly identifies as AI (recall). Only the first 150 texts of each dataset are considered; “Average” represents the mean of the four AI datasets.
2 · False accusations — how many human-written texts the detector wrongly calls AI, counted on the first 150 texts of the GEDE Human dataset. Lower is better.
3 · Cumulative score — the mean of the average detection score and (100% − the false-accusation rate). Higher is better.
4 · Pricing — entry plan and monthly price, as listed in August 2026. GPTZero is priced in euros; the other listed prices are in US dollars.

90% and above · 0–1 false 60–89% · 2–4 false below 60% · 5+ false Green bold — best result in the column

Scope: GEDE corpus — academic essays in English. AI texts generated with Llama-3.3-70B-Instruct and GPT-4o-mini. Detector versions and prices as tested in August 2026. Full methodology and raw results: in our community.

An AI Detector That Tells You the Truth

Every tool available on the market makes mistakes. A big difference is that this product will always admit when it is wrong. Clever AI Detector makes a claim with a probability, not a "100% accurate" statement, and it admits when it is not confident about its claims.

Something very close to the middle of the scale is basically saying "I have no idea," and it would rather admit it than try to pretend it knows.

That is what makes it an honest detector - a claim with a probability that it can back up, not a "fact" it knew beyond the shadow of a doubt.

Honest by design

Why Clever AI Detector Gives You an Honest AI Score

Our AI detector is based on one rule: report probability, not certainty.

Rather than stamping everything with tidy grammar with a scary red “AI!”, we use statistical indicators — predictability of wording, regularity of rhythm, phrases typical of AI — and judge each sentence individually. You see the probability as a whole and the sentences that got you there.

Accuracy note: we are often asked whether our AI checker is 100% accurate, and the answer is always no — that is the sort of claim you should question wherever you meet it. Every detector produces the occasional false positive, and it gets worse on overly formal or heavily edited writing. That is why we give a probability based on sentence-level analysis and mark the results we are least sure about.

Per check: Up to 10,000 words
Result: AI score + sentence signals
Verdict style: Probability, not proof
Price: $0 — free while in beta
Languages: English
Extras: Check History

Step by step

How to Check Text for AI for Free

Here are the steps to check any text for AI for free with Clever AI Detector:

Step 1

Go to the website: Clever AI Detector, in your browser.

Step 2

Paste the text that you want to check for AI in the provided text box (30 to 10,000 words).

Step 3

Hit the “Check for AI” button and wait a few seconds for the results.

Step 4

Read the result: the AI probability score, the verdict, and the confidence level.

Step 5

Go through the highlighted sentences to see exactly what triggered the AI signals.

Use cases

Who Uses an AI Detector and Why

Clever AI Detector answers one question: how likely is it that this text was written by AI? The score is a signal to inform your judgement — never a replacement for it.

Since AI text now appears in every field, people run an AI check for rather different reasons:

Editors, publishers, and content managers

Editors check incoming drafts and guest posts before publishing, so the byline honestly reflects who — or what — wrote the piece.

Students and learners

Run an AI check on your own draft before you submit it — see how it reads and which sentences might draw questions.

Professionals writing at work

Run an AI check on an important email, report or proposal to make sure it reads like you, not like a bot.

SEO writers and content marketing teams

SEO teams audit their own pages: heavily AI-flavored content reads generic to users, and generic content rarely earns links or trust.

Writers checking their own work

Writers run their drafts through an AI check before sending, to see how the text reads statistically — and rewrite the parts that sound machine-made.

Definition

What Is an AI Detector and How Does It Work?

AI detector: A program that tries to find the probability of a text being created by an AI. This is achieved by analyzing statistical parameters that distinguish human-created text from AI-created texts – predictability of each subsequent word, uniformity of the rhythmic structure of the sentence, frequency of usage of unique AI phrases – and transforming the analysis into a numerical value between 0 and 100.

What Does an AI Score Actually Mean?

It is a probability, not a verdict. 90% AI means the statistical picture strongly resembles machine writing — it does not mean 90% of the words were typed by a robot.

Free AI Checker with an Honest Score — No Paywall

free while in beta

10,000

words per check

0–100

probability, not a verdict

Most AI checkers hide sentence-level detail behind a paywall — and too many advertise “99% accuracy” that no honest detector can promise.

However, not Clever AI Detector! While in beta the full result — score, verdict, confidence, and sentence signals — is free, subject to service availability.

Clever AI Detector vs. Other AI Checker Tools

What matters	Clever AI Detector	Typical free checkers	Typical paid checkers
Price	$0 — free beta	Free with limits	Subscription
Words per check	Up to 10,000	300–500	1,000–5,000
Score honesty	Probability + confidence level	“99% accurate” claims	Varies
Sentence-level signals	Yes, highlighted in the text	Rarely	Often paywalled
Check history	Yes	No	Sometimes

Free account

Save Your AI Detector History for Free

Why would you sign up? The detector is free for everyone who uses it, signed up or not. Signing up simply adds a few things for the people who come back:

Check History — every check you run is saved in your account
Come back at any time, open a past check, or see how the scores move
Nothing gets lost between sessions
Honest scores with sentence signals, always improving

Made for the everyday text checker: the results are always there when you need them.

Clever AI Detector Beta: Free AI Checker with Sentence-Level Signals

News · July 2026 · Clever AI Detector

We have updates for July, and they are good updates. Our AI detector is up and running in beta version – free, ad-free and without any paywall, alongside our humanizer that you’re familiar with.

Under the hood it combines statistical analysis with pattern matching trained on large sets of human and AI writing, and scores every sentence separately. Instead of a scary red stamp you get a probability, a confidence level, and the exact sentences that triggered the signals.

It will keep improving through the beta — without training on the text you submit — and it will keep being honest about what it doesn’t know. Great job done by our LLM scientists!

FAQ

AI Detector FAQ: How to Check Text for AI

What is Clever AI Detector and how does it work?

Clever AI detector is a free AI checker which approximates how likely any text was generated by AI. On statistical signals like predictability of words, consistency of rhythm, similarity to phrasing of common AIs is carried the check. Then matching is scored in percent for every sentence separately; the final score is given also in a scale of 0-100.

How accurate is Clever AI Detector?

No AI detector is 100% accurate, not even ours, which means that a tool which purports to be able to detect AI content beyond doubt is not being completely honest. The Clever AI Detector provides you with a probability, along with signals at a sentence level, and is upfront about when it is not confident in its results. As such, do not rely on the score alone – treat it as one piece of information amongst others.

Why is Clever AI Detector free? What's the catch?

There are no catches. CleverFiles as a company has a tradition of releasing a product for free and moving on to a paid version after 1-2 years. The detector is currently in beta and free to use, no ads and no paywall.

Can it detect text from ChatGPT, Gemini, Claude, and other AI tools?

Yes. Most text created by AI chatbots carries the same statistical patterns: similar sentence lengths, predictable word choice, characteristic phrasing. The Clever AI Detector hunts for these patterns whatever produced the text — ChatGPT, Gemini, Claude, DeepSeek, or another AI writer.

What is a false positive, and can human writing be flagged as AI?

A false positive is human writing that a detector wrongly marks as AI. Every detector produces them, and formal, heavily edited or non-native texts get hit most often, because that writing is naturally more uniform. Detection is a probabilistic job — the answer is never certain, only more or less likely — which is why we report a probability with sentence-level cues, and why a high score is the start of a conversation rather than the end of one.

How do I check text for AI using Clever AI Detector?

Copy your text into the input box and click “Check for AI”. A moment or two later, you will see an AI probability score, the result along with the confidence level, and a list of the most suspicious sentences.

What does the AI score actually mean?

The score is the probability that your text was generated by AI. 90% AI does NOT mean "90% of the text is AI", it means that the statistical profile is close enough to AI writing to be reasonably certain. The closer the result is to the middle, the less certain we are, and we say so explicitly.

Which types of text can I check?

Essays, articles, blog posts, emails, product descriptions, cover letters, reports – your choice of English text, any length between 30 and 10,000 words. Anything shorter than that contains too few signals for the score to be meaningful and that is why there is a 30-word minimum requirement.

What's the difference between an AI detector and an AI humanizer?

They are opposite ends of the same question: an AI detector guesses if a text was written by AI, while an AI humanizer softens AI-written drafts. Both function on this page as a team: check your text here, and if it's the tone that's the problem, refine it with Clever AI Humanizer.

Can I rely on the score for academic or hiring decisions?

No single detector score should determine anyone's grade, job or reputation. There are bound to be false positives, and the people they flag are bound to be real. Consider the number a starting point, examine it in context (version history, drafts, etc.) and a conversation with the author, and never take it as a definite answer.

Does Clever AI Detector store my text?

Checks are run to calculate your score and signed-in users can maintain a history of their checks if they so desire. See our Privacy Policy for additional information regarding how we process your data.

Who is responsible for how the detection results are used?

You make the decisions you base on a result — a score is a probabilistic signal, not a verdict, and should never be the sole basis for action affecting a person. Our Terms of Service describe our responsibilities and their limitations; nothing in these Terms affects rights that you have under mandatory consumer law.

Is this a free AI detector with no sign-up?

Yes. Clever AI Detector is a free online AI checker. Simply paste in text to check for AI, no sign up, ads or paywall (at least while in beta). Creating an account is entirely optional and just unlocks check history.

Can I use it as a ChatGPT detector or GPT checker?

Yes. ChatGPT, GPT-4, GPT-5 generate the same statistical patterns in the text as any other AI model would: similar phrases, word choice patterns, rhythm, etc., so our AI checker works as a detector for ChatGPT as well. Same goes for Gemini, Claude, DeepSeek and other models.

What makes the most accurate AI detector?

Honesty about uncertainty. The best AI detecting software is the one which reports a probability, provides evidence at sentence level and doesn't hide its lack of confidence - just like the Clever AI Detector. This way you can assess the result for yourself, rather than blindly trusting an over-claiming algorithm.

Can I use it as an AI essay checker?

Yes — essays, assignments, and papers between 30 and 10,000 words are a common use case: run an AI check on your own draft to see what the writing looks like before you submit. The score is for informational purposes only — it is not evidence of dishonesty, and must never be used as a basis for accusations or grading against anyone. Human writing, especially formal, heavily edited, or non-native English, can often look AI-like to any detector.

Is it an AI checker and plagiarism checker in one?

No — AI detection and plagiarism detection answer different questions. A plagiarism checker compares your text against existing sources; an AI detector estimates whether the text was machine-written, even if it is 100% “original”. Clever AI Detector focuses on AI detection only.

Why is Clever AI Detector considered one of the best AI detectors?

Because it is trained on the latest LLMs and on millions of human and AI-written texts. It does the job on par with the top AI detectors on the market while being completely free to use, with sentence-level signals and an honest confidence level included.

AI Writing Tools Whose Style We Recognize

The detector is model-agnostic: it looks at how the text is written, not at which tool produced it. Detection is based on shared patterns, not on identifying a specific tool — no individual model is guaranteed to be flagged:

ChatGPT (OpenAI)
GPT-4o / GPT-5 (OpenAI)
OpenAI o1 / o3
Google Gemini
Claude (Anthropic)
Microsoft Copilot
DeepSeek
Meta Llama
Grok (xAI)
Mistral / Le Chat
Qwen (Alibaba)
Perplexity AI
Cohere Command
Kimi (Moonshot AI)
ERNIE Bot (Baidu)
Doubao (ByteDance)
Jasper AI
Copy.ai
Writesonic
Notion AI

Responsible Use of Clever AI Detector

An AI score is a signal, not evidence. Use it to start a conversation or to review a text more closely — together with drafts, version history, and the context you already have.

Never use an AI score as sole proof against a person. False positives are real, and they hurt real people.

Follow the rules of your school, university, or workplace regarding AI-assisted writing. Clever AI Detector is provided on an “as is” basis while in beta.