Slop or Not
Use it for people who want native Apple checks or the free online checker for text, images, and provenance clues.
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AI Detector
GPTZero vs ZeroGPT: AI Detector (2026)
GPTZero fits a teacher already inside Canvas or Google Docs — the classroom integrations and the developer API are real workflow tools, not a bolt-on. ZeroGPT skips all of that for one job done fast: paste up to 15,000 characters, no account, get a read in seconds.
GPTZero and ZeroGPT both flag AI-written text in the browser, but they aim at different users. GPTZero leans into classroom workflows with Canvas and Google Docs integrations, while ZeroGPT is a fast, free paste-and-check box capped at 15,000 characters. If a cloud workflow is not the fit, Slop or Not runs the same kind of text check privately on iPhone and Mac.
Privacy, Pricing, and Workflow Matrix
Public product, pricing, documentation, and benchmark pages can change. Source links are listed below the table so the cells stay readable.
| Feature | Slop or Not | GPTZero | ZeroGPT |
|---|---|---|---|
| Best fit | On-device iPhone and Mac checks or free browser checks for text and images | AI text checks for teachers, writers, students, recruiters, and teams | Fast free web checks for AI-written text |
| Text detection | Checks writing in the native app and online checker | AI Detector and Advanced AI Scan products | Free AI content detector for ChatGPT, GPT-5, Gemini, and more |
| Image detection | Checks photos, synthetic images, and provenance clues in the app or online checker | No GPTZero is text-only; its "AI Vision" scans for AI-written text, not images | No |
| Deepfake detection | Covers deepfake and synthetic-image checks as image detection | No | No |
| Metadata and provenance signals | Reads SynthID, C2PA, and IPTC signals in native and online image checks when a file carries them | Not publicly clear | Not publicly clear |
| Manual forensic tools | Reports detector and provenance evidence in native and online checks; not a manual forensic editor | No | No |
| Evidence level | Probability verdict plus provenance signals, with internal-test caveats instead of 99.9% certainty claims | Advanced AI Scan and AI probabilities are listed | Returns probabilities and detailed statistics through API plans |
| Browser checker | Free online checker runs in any browser on Numen's private Mac server; submissions are deleted after processing | Web detector plus Chrome extension | Public web textarea lists a 15,000 character input limit |
| Native Apple app | Native iPhone and Mac app for on-device checks; browser users can use the free online checker | No Web app and browser extension; no native iPhone or Mac app | No |
| API workflow | Pro Mac app includes a local CLI and MCP server; no public hosted API | Developer API integration is listed | Business API plans and API docs are listed |
| Classroom workflow | Useful for checking student writing on-device in the app or through deleted-after-processing online checks | Canvas and Google Docs integrations are listed | Not publicly clear |
| Free tier & limits | Free daily checks in the iPhone and Mac app and a free online checker in any browser. Pro removes the native daily cap; the native app has no per-document word cap. | Free plan (~10,000 words/month, 10,000-char per-scan limit); paid Essential, Premium, and Professional plans are listed | Free web checks with a 15,000 character input box; API plans are pay as you go |
| Privacy | Native checks stay on the iPhone or Mac and never send submitted text or images to a third-party AI provider. Online checks run on Numen's own Apple hardware, and submissions are deleted after processing. | Its privacy policy lists content submitted for detection as a collected data category, alongside account, contact, and payment data; retention for web-submitted content is not stated | Its FAQ says submitted text is processed only to generate a result and then discarded, and is not saved, shared, or used to train its model; the separate privacy policy does not name detection text as a collected category |
| Main limitation | On-device privacy requires iPhone or Mac; browser checks run on Numen's private Mac server, not on-device | Public pages center on text detection and integrations | Public web checker is capped at a 15,000 character input limit |
✓ = supported, ✕ = not offered, – = not publicly documented. Details reviewed June 2026 from public product, pricing, documentation, and benchmark pages.
Where Slop or Not Fits
Neither rival gives up its ceiling for free: GPTZero locks its best tools behind a Canvas or Google Docs login, and ZeroGPT stops reading at 15,000 characters. Slop or Not skips both — no classroom account, no character limit, right on iPhone or Mac.
- Slop or Not runs its own detection models, so no third-party AI provider sees your text or images. Native checks run on the Apple Neural Engine; online checks run on Numen's self-hosted Apple hardware, and submissions are deleted after processing.
- Free daily checks in the iPhone and Mac app and in the free online checker. Pro removes the daily cap, and native checks have no per-document word cap.
How They Compare by Workflow
Slop or Not is not the right answer for every workflow — pick the tool whose strongest workflow matches the check you need to run.
GPTZero
Use it for teachers and teams that want a text detector inside classroom or document workflows.
ZeroGPT
Use it for quick web checks for AI-written text.
Related Comparisons
Keep comparing adjacent tools before you pick a workflow.
Slop or Not vs GPTZero
GPTZero lives in Canvas and Google Docs and never leaves the browser — and it never checks an image, despite the 'AI Vision' name.
Slop or Not vs ZeroGPT
ZeroGPT needs no account and returns a verdict in seconds, but paste in more than 15,000 characters and it stops reading.
GPTZero vs Originality.ai
GPTZero fits a teacher's free plan; Originality.ai fits a publisher's paid credit meter.
GPTZero vs Copyleaks
GPTZero is a teacher's browser tool; Copyleaks is a district's enterprise suite with image and deepfake detection built in.
GPTZero vs Turnitin
GPTZero is self-serve with a free tier; Turnitin only exists inside a school's paid subscription.
Winston AI vs GPTZero
Winston AI sells trial-based reports; GPTZero gives away classroom integration for free.
Privacy tools from the same team
More From Numen
AI can now fake a profile photo or wrap a scam in a link that looks safe to tap. Numen builds the apps that put you back in charge: spot AI-generated text and images with Slop or Not, run the best open-source models uncensored and private with Private LLM, and strip trackers from links and QR codes before they follow you with Clean Links.
One belief runs through all three: your data belongs to you, and no one else.
