Compare AI detectors
isGenAI vs ZeroGPT: AI checker alternative
ZeroGPT estimates how likely it is that a language model wrote a text, with a percentage gauge and highlighted sentences, up to 15,000 characters per check, plus plagiarism, image and video detectors. isGenAI never estimates authorship from style: it shows declared AI use with the exact sentence and reads C2PA, AI labels and saved prompts in image files, free with no account.
isGenAI (isgenai.com) is not affiliated with ZeroGPT. Looking for ZeroGPT itself? Go to www.zerogpt.com.
isGenAI and ZeroGPT compared
| Question | isGenAI | ZeroGPT |
|---|---|---|
| Free use | Free, up to 16,000 characters per check. | Text detector input up to 15,000 characters; a free plan with no credit card. (source) |
| Sign-up | None. No account, no email. | The free plan has a sign-up button; its pages do not say whether the basic check needs an account. (source) |
| Paid plans | None needed. | Personal, Business/EDU and custom Enterprise plans, with an annual discount. (source) |
| Method | Finds declared AI use, such as “drafted with ChatGPT”, and shows the exact sentence. It keeps a mere mention of a tool apart from a statement of use and gives no writing-style probability. | Linguistic and statistical signals give an overall likelihood score with highlighted passages; it works better above about 150 words. (source) |
| Other detectors | Images: C2PA, IPTC labels and saved prompts. Code: declared AI use. | AI image and AI video detectors, and a plagiarism checker. (source) |
| API | POST /v1/check with a file, URL, text or code. No API key for the documented endpoints. | Pay-as-you-go API with a dashboard key and an IP whitelist. (source) |
| Privacy | Pasted text and code are private by default; the exported report leaves the pasted content out. | Checked text is not saved, shared or used to train its model; hosting in Germany under GDPR. (source) |
| Result | The matching sentences, labelled as declared use, tool mention or code integration. | A percentage gauge with highlighted AI sentences. (source) |
When to use which
Choose ZeroGPT when
- You want a likelihood score for text with no disclosure in it.
- You also want plagiarism, paraphrasing or summarising tools from the same site.
- You process large volumes through a paid API with IP whitelisting.
Choose isGenAI when
- You want only findings you can point to, with no style-based accusation.
- You need code checked for declared Copilot or ChatGPT use, or images checked for C2PA and saved prompts.
- You need a free API call with no key.
How to do the same job with isGenAI
- Paste up to 16,000 characters of writing or code into isgenai.com/ai-text-detector and choose the writing or code button.
- Read the findings: each one shows the sentence that declares AI use, such as “written with Claude”, or names a tool without claiming it wrote anything.
- Use declared statements as the basis for a conversation with the author, and compare them with drafts, commits or version history.
- If you need a probability that unlabelled text came from a model, use a classifier as a second opinion and treat its score as a lead, not proof.
Questions
Is isGenAI a free ZeroGPT alternative?
It is free with no account, and answers a narrower question: was AI use declared, and where? For an estimate of authorship on unlabelled text you would still use a classifier such as ZeroGPT.
Why might ZeroGPT flag text that isGenAI does not?
ZeroGPT scores style. isGenAI reports only statements in the text, so plain human-looking or AI-looking prose with no disclosure produces no finding in isGenAI.
Does isGenAI store my text?
Pasted text and code are private by default, and the exported report leaves the pasted content out.
Is isGenAI affiliated with ZeroGPT?
No. isGenAI is independent and not affiliated with ZeroGPT. Facts here come from zerogpt.com as of October 2026.
Sources
Every statement about ZeroGPT comes from these pages, read as of October 2026. Products change; check the page before you rely on a detail. Product names belong to their owners and are used only to identify them.