A Copyleaks alternative with free sentence-level results and no login
IsThisAiWritten is a free Copyleaks alternative with a sentence map on every check and no login. Of the two, it is the only one that is free with no sign-up, no word limit and no upload: the analysis runs inside your browser, so your writing never leaves your device. Copyleaks lets you scan 25,000 characters without logging in, more than most of the free checkers we compared, but the sentence-by-sentence view needs an account and its privacy policy says submitted content is used to train its models.
Choose IsThisAiWritten for a free, private check of text of any length: no account, no credits, a sentence map and style notes on every check, and nothing leaves your browser. A whole thesis goes through in one pass, pasted or opened as a .docx file. Copyleaks fits schools and teams that want its 30+ languages, AI and plagiarism results in one report and links into seven learning platforms.
Copyleaks alternative: how the two compare
Copyleaks details are from its own pages at the time of writing.
| IsThisAiWritten | Copyleaks | |
|---|---|---|
| Price for basic use | Free | Free scans up to 25,000 characters. Personal plan $13.99 a month billed annually ($167.88 a year) for up to 300,000 words a month |
| Sign-up required | No | Not for the basic scan. A free account is needed for sentence-level detail |
| Character limit per check | No limit | 25,000 characters without login. Account holders can upload up to 2,000 pages, paid in credits |
| Daily limit | None | Not stated. New accounts get a limited number of free credits |
| Where your text is processed | In your browser. Never uploaded | On Copyleaks' servers |
| Data stored | Nothing | Privacy policy says submitted content is used to train its models; direct customers can opt out through support |
| Long documents (novels, theses) | One pass, free | Yes with an account and credits |
| Sentence-level highlighting | Sentence map without an account, relative within your text | With a free account |
Why look for an alternative to Copyleaks?
Copyleaks reports over 99% accuracy and a 0.03% false-positive rate by its own measure, and publishes figures by language. The reasons to look elsewhere are about access and privacy. The anonymous scan is generous on length but thin on detail. Without an account you get the percentage of your text that is likely AI-generated. Copyleaks says the sentence-by-sentence insights, highlighted AI phrases and pattern breakdowns come when you sign up for a free account, and its explainable AI Logic feature belongs to the paid plans. For a student who wants to see which paragraph caused a high score, that means creating an account first.
The privacy policy is the bigger question for some people. Copyleaks' privacy policy says the content you submit is used to provide the service and also to train its models. Direct customers can opt out of training by emailing support. There is also a Shared Data Hub: a database of scans that other users chose to include, which Copyleaks compares new submissions against. It is optional and can be switched off, and files can be deleted from it. Still, if a draft is confidential, every one of those settings is something to check before you paste.
For scale: 25,000 characters is roughly 3,500 to 4,000 words of ordinary English, enough for most essays. A 10,000-word dissertation needs three anonymous scans, and each returns its own percentage.
Long documents cost credits. The web platform takes files up to 2,000 pages, which is plenty, but the Personal plan's 1,200 monthly credits cover up to 300,000 words (or 1,200 images).
What IsThisAiWritten offers instead
A sentence map with no account
Every check shows an outcome (Human, Mixed, AI or Inconclusive) with a confidence word, an AI-likeness score and a sentence map, all without signing up. The map is relative: it ranks sentences within your text by how AI-like they look, which is a sensible way to find passages worth rereading.
No upload, so no training question
With Copyleaks, keeping a draft out of training means emailing support and checking the Shared Data Hub setting. Here there is nothing to opt out of: the check runs inside your browser and we never receive a copy. The private AI detector page shows how to confirm that yourself.
Any length, free
No character cap and no credits. The 10,000-word dissertation that needs three anonymous Copyleaks scans goes through here as one, with one result. For books and theses, see AI detection for long documents.
An open methodology
How the detector works and how it is tested is published on our methodology page, and every word of your text is scanned, never sampled. If you write in a second language, our article on AI detectors and non-native English explains what to keep in mind with any score.
Where Copyleaks is better: it reads more than 30 languages for AI detection and over 100 for plagiarism, and puts AI and plagiarism results in one report. It integrates with Canvas, D2L, Moodle, Blackboard, Schoology, Edsby and Sakai, has a Chrome and Edge extension and a Google Docs add-on, and offers an API.
Keep using Copyleaks if your school or organisation needs LMS integration, plagiarism checks or its language coverage.
Other Copyleaks alternatives
Originality.ai also pairs AI and plagiarism checks, with three free AI scans a day of up to 2,000 words (Originality.ai alternative). GPTZero gives 10,000 characters per scan without an account and highlights sentences (GPTZero alternatives). Pangram reports a false-positive rate of 1 in 10,000 and 20 free checks a day with an account (Pangram alternatives). For a wider round-up, see the best free AI detectors.
Sources
- Copyleaks AI Detector and FAQ (limits, accuracy, languages, integrations), checked October 2026
- Copyleaks pricing, checked October 2026
- Copyleaks privacy policy (training, Shared Data Hub), checked October 2026
- Originality.ai AI Checker, checked October 2026
- GPTZero, checked October 2026
- Pangram, checked October 2026
Is this AI written? Check it now.
Free, no sign-up, no word limit. The check runs in your browser, so your text never leaves your device.
Check text freeIsThisAiWritten is not affiliated with, endorsed by or sponsored by any company named on this page. Product names belong to their owners. Facts about other products come from their public pages on the date shown and may have changed since.