One thing first, because it decides whether this page helps you at all. NoteGPT is a study and summarising suite of roughly forty tools, and only two of them check or rewrite text. If you are replacing the video summariser, the transcription, the flashcards or the note taking, nothing here is relevant and you should stop reading.
Paste some text or load the example to estimate AI likelihood.
NoteGPT (notegpt.io) describes itself on its homepage as "Your All-in-One AI Learning Assistant". The catalogue is large: video and PDF summarising, transcription, text to speech, podcast generation, voice cloning, image generation and editing, slide generation, essay writing and grading, flashcards, quizzes, translation, and a chat interface offering several model families.
Two of those tools matter here: an AI Detector at /ai-detector and an AI Humanizer at /ai-humanizer. Both have their own landing pages, and both are metered on the pricing page under "Basic Quotas", listed beside transcription, summary, mind map and translation.
That framing matters. Detection is not what NoteGPT is for. It is a line item inside a study suite, and whether that is a problem depends entirely on why you are there.
The company is named. The Terms of Use identify the entity as "NoteGPT Inc.", give support@notegpt.io as contact, and carry an effective date of 28 April 2026. The domain has been registered since April 2023.
The detector is live and genuinely open. A POST to notegpt.io/api/v2/text-detector with no authentication returned HTTP 200 in about 3 seconds on 16 August 2026. The response is more detailed than most free checkers give you:
`` {"code": 100000, "message": "success", "data": {"is_human": 100, "ai_percentage": 0.0, "ai_word_count": 0, "total_word_count": 62, "ai_sentences": []}} ``
I sent three passages. A casual conversational one returned is_human: 100. A deliberately formulaic corporate one returned is_human: 50. A twelve word sentence was rejected with {"code": 164001, "message": "wrong params"}, so a minimum length is enforced.
Two honest caveats. I wrote all three passages myself, so ai_percentage: 0.0 on both completed probes is consistent with the truth and says nothing bad about the tool. What the probes establish is that the endpoint is live, open without a login, enforces a minimum length, and returns two separate figures. is_human and ai_percentage moved independently in my tests, which is worth knowing if you are reading one number on screen and treating it as the whole answer.
The humanizer did not behave as its landing page describes. That page is headed "Free AI Humanizer" and the heading continues with the words "100% Human Text & No Sign-up, Unlimited". An unauthenticated POST to notegpt.io/api/v2/rewriter/stream returned:
`` {"code": 164003, "message": "login expired"} ``
The pricing page describes it differently again, metering "AI Humanizer" inside the same Basic Quotas bucket that Pro caps at 1,000 a month. So three of NoteGPT's own surfaces describe the humanizer's availability three ways: unlimited and sign-up free on the landing page, quota metered on the pricing page, login gated at the endpoint. I report what each returned rather than guess which is intended. Check it yourself before planning around "unlimited". The client also enforces a 300 character minimum, and offers nine preset tones plus style, length and similarity controls.
The detector page claims "near 100% accuracy in detecting content generated by AI models like ChatGPT, Gemini, Claude, and more", and states "No login required". Both are NoteGPT's claims, reported as theirs. The page also lists an input allowance shown as "0/20000" characters, file uploads to 40MB covering PDF, PPT, Word and TXT as well as JPG, PNG and WEBP images, and support for "multiple languages", naming Chinese, Spanish and Japanese as examples.
Pricing, from notegpt.io/pricing, in US dollars:
| Plan | Monthly | Annual | Detector and humanizer allowance |
|---|---|---|---|
| Free | $0 | $0 | 15 monthly quotas |
| Pro | $9 | $108/yr | 1,000 Basic Quotas per month |
| Unlimited | $19.92 | $239/yr | Unlimited Basic Quotas |
| Max | $69 | $829/yr | Unlimited Basic Quotas |
Two clauses in the Terms of Use are worth reading before uploading anything sensitive. Refunds are available "within 24 hours of your first purchase only", reduced by the value of any Premium Credits used, and "Discounted purchases are non-refundable". Separately, uploading content grants NoteGPT "a worldwide, non-exclusive, royalty-free, transferable, sublicensable license to use, reproduce, distribute, modify, display, and perform" that content, limited by the same clause to "operating, improving, and promoting the Service". Users do retain ownership of AI generated output.
For most people who use it, the honest answer is that we cannot replace NoteGPT, and it is not close.
If you came for summarising, transcription, flashcards, quizzes, slide generation, voice work or the chat interface, we offer none of it. TextSight does one job. Swapping a forty tool suite for a detector leaves you shopping for six other products, which is a bad trade for a student or anyone running a study workflow.
Even on detection alone it beats us in places. Its detector is open without an account, where ours is not beyond three checks a day. It accepts up to 20,000 characters at once, well above our anonymous cap. It takes image uploads, which we do not. And it advertises multiple languages, where we are English only and say so.
If you are checking Chinese, Spanish or Japanese text, NoteGPT offers something we do not offer at all, and you should test it against your own material rather than switching on the strength of a comparison page.
TextSight is a detector rather than a suite, which is a disadvantage if you want breadth and an advantage if you want depth on one thing.
The box above runs the live product. Anonymous use allows 3 checks a day, pooled across the AI Detector and the Document Detector, capped at 1,000 words with a 25 word minimum. A free account raises that to 60 checks a day at up to 5,000 words, and saves every scan run while signed in to Scan History. That is not a paid feature: free accounts get it too. Starter allows 200 a day; Pro and above are unlimited.
Rather than a bare percentage, results land in three bands. Under 30 reads "likely human-written", 30 to 69 "mixed signals", 70 or above "likely AI-generated". Sentence-level analysis and PDF export start at Starter, with file upload, URL scan and bulk scan. The Chrome extension and REST API start at Pro. Teams and branded reports start at Business.
Plans run Starter $9.99 a month or $7.49 annually, Pro $19.99 or $14.99, Business $39.99 or $29.99, Enterprise $79.99 or $59.99, annual billing being 25 percent below monthly.
The limitation, stated plainly: our detector is an English-only ensemble built on DeBERTa, RoBERTa and ELECTRA, and it carries a known false-positive bias against writers using English as a second language. If your English reads as ESL, treat a high band from us with suspicion, and never let a tool of any brand stand in for a judgement about your work.
/api/v2/text-detector endpoint answered an unauthenticated request with HTTP 200 on 16 August 2026, returning is_human, ai_percentage, ai_word_count, total_word_count and an ai_sentences array.All checked 16 August 2026, all on notegpt.io unless stated.
wrong params rejection below the minimum length.{"code": 164003, "message": "login expired"}. Client bundle enforces a 300 character minimum.The deeper head-to-head: feature table, where GPTZero wins, where TextSight wins, and migration steps.
Read the comparePerplexity, burstiness, and transformer scoring explained, so you can read any detector's verdict critically.
Read the guideWhy detectors over-flag ESL and formal writing, and how sentence-level evidence helps you defend real work.
Read the guideThe full ranking with detection approach, pricing, and use-case fit side by side.
See the rankingStart with TextSight's free tier. No card, no signup, no commitment. Your first scan in about six seconds, with the evidence shown line by line.
Honest comparisons vs other tools.