Is your text original?
Find out whether writing was produced by AI or by a person, catch passages copied from the web, and get an authenticity score with clear, sentence-by-sentence advice to make it better.
One clear score, built from evidence you can see
The Authenticity score (0 to 100, with a letter grade) blends three independent checks. Every number links back to the sentences behind it.
AI or human? 50%
An AI model reads each section for hallmarks of chatbot writing, combined with style statistics such as sentence rhythm, stock phrases and personal voice. You see a likelihood for every sentence.
Originality 35%
We search the web and Wikipedia for your most distinctive sentences, read the best-matching pages and flag passages that are copied or closely paraphrased, with links to the sources.
Writing quality 15%
Readability (Flesch-Kincaid grade), sentence variety, vocabulary range, voice and specificity, clichés and passive voice, each scored with a plain-English explanation.
Start the conversation with evidence, not accusations
- See which sentences look AI-written and why, instead of a single opaque number.
- Find copied or lightly reworded passages with the original sources side by side.
- Compare two submissions, or a draft with a final version, in the Compare tool.
- Generate rubrics, writing prompts and kind, specific feedback in seconds.
- Save every check to your dashboard to revisit later.
Publish work that sounds like you and ranks as original
- Catch robotic, AI-sounding sentences before your readers do.
- Rewrite in your own voice, polish grammar and tighten readability.
- Make sure nothing is accidentally copied, and cite what should be cited.
- Draft blog posts, newsletters, captions and scripts, then check them in one click.
- Plug checks into your own workflow with the Pro API.
A complete writing integrity toolkit
Sign in to use every tool and keep your work saved in one dashboard.
AI & originality check
Full report with the Authenticity score, highlights and sources.
Improvement advice
Sentence-linked fixes plus AI-suggested rewrites.
Draft writer
Essays, blog posts, emails, lesson plans, rubrics and more, with tone and length controls.
Humanize & rewrite
Rewrite stiff text in a natural voice, or match a sample of your own writing.
Paraphrase & cite
Paraphrase a source properly and attach the citation.
Citation generator
APA, MLA and Chicago citations from any web address.
Grammar & style polish
Fixes with a clear list of what changed and why.
Summarizer, readability & compare
Summaries, reading level, word counts and a side-by-side similarity check.
Start free. Upgrade when you need more.
Every account includes the full report, advice, writing tools and a saved-text dashboard.
Free
- 50 checks a month
- 30 AI drafts a month
- 100 tool runs a month
- Save up to 200 documents
Pro API access
- 1,000 checks a month
- 500 AI drafts a month
- 2,000 tool runs a month
- REST API: 5,000 calls a month
- Save up to 5,000 documents
Billed monthly through Stripe. Cancel anytime.
What a detector can and can't tell you
No AI detector is perfectly accurate, and anyone who claims otherwise is overselling. Formal or technical human writing, writers working in a second language and heavily edited AI text can all be misjudged. We show our reasoning sentence by sentence and label every AI result as an estimate. Please use it as one piece of evidence, never as the sole basis for a grade or a decision about a person.
Questions
How accurate is the AI detection?
It's an estimate. It combines an AI model's judgment with statistical style signals, and both overlap between people and models. Short texts, formal writing and edited AI output are hardest to call. Treat it as a reason to look closer, not as proof.
How thorough is the originality check?
We sample up to 8 distinctive passages, search the public web and Wikipedia, and read up to 8 of the best-matching pages. It catches copied and lightly reworded web content well, but it can't see paywalled journals, private documents or other students' submissions.
Do you keep my text?
Free checks on this page aren't saved. When you're signed in, texts and reports are saved only to your account so you can come back to them, and you can delete them at any time. To run a check, passages are sent to search engines as queries and to Cloudflare Workers AI for analysis.
Do I need an account?
You can run one free check a day here without an account. A free account unlocks more checks, saved reports, AI rewrites, the draft writer and all the writing tools.
Is there an API?
Yes. Pro subscribers can create API keys and call detection, scoring and generation endpoints. See the API docs.