If you want a ZeroGPT alternative, this site is a free AI checker you can use now. Paste at least 65 words and it returns an AI score from 0 to 100 with one of three labels: Reads as AI-generated, Borderline, or Reads as human-written. One check costs one credit at any length, so scoring a whole draft costs the same as scoring a paragraph. A one-click humanizer sits beside it and rewrites every sentence at one credit per 50 words. The free tier is 10 credits a day per network, with no account, no login, no card and no email address. ZeroGPT is a separate product from a separate company, and this site has no connection to it. Before you trust any score, this one included, read the part below on what a number like that can and cannot tell you about authorship.
The checker takes a passage of at least 65 words and returns the 0 to 100 score with its label. One run costs one credit at any length, so checking a full dissertation chapter costs exactly what checking a single paragraph costs.
The humanizer rewrites every sentence in one click. A single run takes up to 12,000 characters, roughly 2,000 words, with a 25-word minimum, at one credit per 50 words.
The free tier is 10 credits a day, counted per network. Nothing is registered, so there is nothing to verify and nothing to cancel. A separate set of tools at free AI writing tools runs entirely in your browser, with no credit cost and no daily cap:
A checker has one input, which is the finished text. Everything it reports comes from measuring regularities on that surface, and those regularities are the ones language models overproduce, because a model picks a likely next word sentence after sentence with nothing pulling the rhythm out of line. What gets counted includes:
That makes the number useful in one specific way: it points at the writing rather than at you. The AI vocabulary checker names that wording inside your own sentences and offers replacements, and the full list of named tells. A score you can act on beats a score you can only worry about.
Here is the limit that matters, and it applies to every checker including this one. No classifier watched your document being written; it sees the text that arrived. A sentence carries no record of the keystrokes or the drafts behind it. A score reports how closely a passage resembles the statistical habits of machine writing, and resemblance is not origin.
The gap opens in both directions. Human writing lands in the flagged register constantly: people taught English from textbooks write clean, evenly weighted sentences because that is what they were graded on, and the five-paragraph essay is drilled in so that every paragraph opens alike. Liang and colleagues at Stanford HAI found in 2023 that across seven detectors, 61% of TOEFL essays written by non-native English speakers were falsely flagged as AI-generated. Those essays were written by people.
It opens the other way too: text a model produced can be edited until the surface regularities are gone, and a falling score does not change what produced the first draft. Read a high score as a statement about the prose, and a low score the same way. Neither is a finding about a person. If a score has been quoted at you as proof, the mechanism is at why detectors flag human writing and what to do about an accusation is at you wrote it and were accused. For teachers takes up what a score is worth as evidence, and for second-language writers covers the same ground for anyone who learned English as a second language.
Run one paragraph through several checkers and you will often collect several different numbers. That is not a fault in any of them. Each was built on its own training data, weighs the properties above differently, and sets its own cut-off for where a label changes. Most publish neither the weights nor the thresholds, and owners retrain when they choose.
Two things follow. First, no tool can tell you what another will say about your text tomorrow, which is why this site makes no claim about the output of any product it names. Second, the disagreement is information: a passage that reads high everywhere has strong surface regularity, and one that splits the room sits near a boundary. Either way the sentences worth editing are the same ones.
If your real question is authorship rather than style, the evidence has to come from the writing process. Version history, dated drafts, notes and a record made while the document was being composed all speak to it. A score computed afterwards does not.
That is why this site includes a signed drafting record. It captures how a document came together while you write and signs the result with an ECDSA P-256 key. Anyone you hand the report to can check it at verify a report, in their own browser, without contacting us. It either verifies against the exact document it belongs to or it does not.
It is a voluntary record of a drafting process, not a verdict on the finished text. Start one before you write rather than after a score comes back, because a record that begins after the accusation is not a record of the writing.
Check the whole document first. One credit covers any length, so scoring everything beats sampling one paragraph and guessing about the rest.
Then work on the wording rather than the number. The vocabulary checker costs no credits and names constructions in place, so the fastest work is by hand: cut the stock opener, break the paragraph that begins like the previous three, let one sentence run long and the next one stop short. On 10 credits that comes to one check, 400 words of rewriting and a second check, which is exactly 10.
Read the result aloud before you use it. A rewrite that scores well and no longer sounds like you has solved the wrong problem.
It is free, and there is no account. No login, no card, no email address, nothing to verify and nothing to cancel. The free tier is 10 credits a day, counted per network. The proofreader, word counter, readability checker, AI vocabulary checker, originality check and signed drafting record run in your browser with no credit cost and no cap.
No, and treating it that way is the most common mistake made with these tools. A score measures how closely a passage resembles the statistical habits of machine writing. No classifier observed the document being written, so origin is not something it has access to. Liang and colleagues at Stanford HAI found in 2023 that 61% of TOEFL essays by non-native speakers were falsely flagged as AI across seven detectors.
Because the measurements need enough sentences to mean anything. Sentence length variation, opener repetition and connective density are patterns across a passage, and a few lines do not contain one. The reading needs roughly 64 tokens before it settles, and a word is never fewer than one token, so 65 words clears the floor for any input.
One run takes up to 12,000 characters, roughly 2,000 words, with a 25-word minimum, at one credit per 50 words. Longer pieces go through in sections. On anything long, check the whole document for one credit first, see which sections carry the score, then rewrite those.
You can build a record of it. The drafting record captures how the document came together as you write and signs it with an ECDSA P-256 key. Whoever you give the report to can verify in their own browser. Start it before you write, because a record that begins after an accusation is not a record of the writing.
Your course policy decides that and nothing else does. Rewriting a draft you were permitted to generate is ordinary editing. Where AI is not permitted in submitted work, that rule covers the draft however it is edited. Read the policy that applies to you.