Compare AI detectors
isGenAI vs Copyleaks AI detector
Copyleaks is a detection and plagiarism platform: its API covers AI-generated text, images and video, plus plagiarism checks for text, code and images, behind an account login and API key. isGenAI is free with no account or key. It shows declared AI use in text and code with the exact sentence, and reads the C2PA, AI labels and saved prompts in image files.
isGenAI (isgenai.com) is not affiliated with Copyleaks. Looking for Copyleaks itself? Go to copyleaks.com.
Copyleaks’ main website did not load for our reader in October 2026, so this comparison uses only its public developer documentation. For free limits and prices, check copyleaks.com directly.
isGenAI and Copyleaks compared
| Question | isGenAI | Copyleaks |
|---|---|---|
| Free use | Free, up to 16,000 characters per check. | Not stated in its developer documentation; see copyleaks.com. |
| Account and key | None. No account, no email. | API access needs an account email and API key, exchanged for a bearer token valid for 48 hours. (source) |
| AI detection coverage | Declared AI use in text and code; C2PA, IPTC labels and saved prompts in images. | AI-generated text, fully or partly AI-generated images, and AI video. (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. | Detection results returned through the API; the documentation pages we read describe the results, not the underlying method. (source) |
| Plagiarism | Not offered. | Plagiarism checks for text, source code and images. (source) |
| Other checks | About 25 free in-browser image tools and a C2PA checker. | Text moderation, grammar and a citation checker. (source) |
| API | POST /v1/check with a file, URL, text or code. No API key for the documented endpoints. | REST API with SDKs for Python, JavaScript, Java, C#, PHP and Ruby; login is rate-limited. (source) |
When to use which
Choose Copyleaks when
- You need plagiarism detection, including source-code and image plagiarism, alongside AI detection.
- You need an AI-likelihood result for unlabelled text, images or video inside an enterprise or LMS workflow.
- You want official SDKs in several languages.
Choose isGenAI when
- You want to try a check now, with no account, login token or API key.
- You want evidence you can quote: the sentence that declares AI use, or the C2PA record inside an image.
- You want a checker that never infers authorship from writing style.
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 alternative to the Copyleaks AI detector?
For declared AI use and file records, yes: free, no account and a keyless API. It does not estimate whether unlabelled text is AI-written and does not check plagiarism, both of which Copyleaks offers.
Does Copyleaks detect AI images too?
Its developer documentation lists AI image and AI video detection alongside text, as of October 2026. isGenAI checks images by reading their records rather than scoring them.
Why is part of this table marked as not stated?
We only state facts we could read on Copyleaks’ own pages. Its main site did not load for our reader, so free limits and prices are left to copyleaks.com.
Is isGenAI affiliated with Copyleaks?
No. isGenAI is independent and not affiliated with Copyleaks. Facts here come from docs.copyleaks.com as of October 2026.
Sources
Every statement about Copyleaks 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.