Who does it serve and what problem does it solve?
Started as a free detector, ranks well for both the brand term "zerogpt" and the generic term "ai detector", with a very complete set of tools
Target Audience
Teachers and students who need to check whether homework or manuscripts were written by AI, and writers who need to pass AI detection
How does it charge?
subscriptionFree tier $0 forever; paid subscriptions such as Personal/Business, 40% off with annual billing, exact amounts not shown on the page
The above describes historical pricing. Check official website for current prices.
Where do users come from?
New customers come mainly from SEO: organic search 60.4%, about 36% non-brand search, with terms like ai detector, ai checker, detector de ia; brand keywords are 53.9% (zerogpt, zero gpt). Referrals come from quillbot.com 4.5%, toolify.ai 4.36% and ucm.es 4.34% (a university site), paid search 5.9%. Returning users come back directly (29.7%) to run checks repeatedly.
Channel share, initial acquisition, and growth drivers are distinct; correlation does not imply proven causation.
What remains to be verified?
The following are research questions, not established market opportunities.
- What do target users actually pay for? Is there direct user feedback or paid interview evidence?
- Are these historical prices still active today? What are the conversion, retention, and fulfillment costs?
- Is the "SEO" channel still viable? What resources do indie devs need to test it?
- Whose needs are competitors failing to meet? Find specific evidence before deciding on your angle.