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
Slop or Not vs GPTZero: AI Detector (2026)
GPTZero belongs inside Canvas and Google Docs, where its Advanced AI Scan runs right inside the tools a teacher already grades in. Once that essay needs to leave the LMS, Slop or Not checks it on the same iPhone the teacher is already holding — no upload, no 10,000-character scan cap.
GPTZero lives in the browser and plugs into classroom tools like Canvas and Google Docs. Slop or Not takes the opposite approach: it runs the check on your iPhone or Mac, so a student essay never leaves the device. The choice comes down to whether you need LMS integrations or private, no-upload checks.
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 |
|---|---|---|
| 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 |
| Text detection | Checks writing in the native app and online checker | AI Detector and Advanced AI Scan products |
| 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 |
| Deepfake detection | Covers deepfake and synthetic-image checks as image detection | 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 |
| Manual forensic tools | Reports detector and provenance evidence in native and online checks; not a manual forensic editor | 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 |
| 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 |
| 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 |
| API workflow | Pro Mac app includes a local CLI and MCP server; no public hosted API | Developer API integration is 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 |
| 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 |
| 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 |
| 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 |
✓ = supported, ✕ = not offered, – = not publicly documented. Details reviewed June 2026 from public product, pricing, documentation, and benchmark pages.
Sources reviewed
Where your text & images go
With GPTZero, your submitted text is used to generate a detection score, and it separately collects account, contact, and payment data when you sign up. See the GPTZero privacy policy for details. Slop or Not keeps native checks on your iPhone or Mac, and online checks run on Numen's own Apple hardware and are deleted after processing.
Where Slop or Not Fits
No Canvas seat, no Google Docs add-on: open the app, paste the essay. Native checks on iPhone and Mac never touch GPTZero's cloud, and there's no character ceiling to work around.
- 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.
Common Questions
Does GPTZero check images the way Slop or Not does?
No — GPTZero is a text detector and doesn't check images. (Its 'AI Vision' feature sounds like it would, but it scans for AI-written text.) Slop or Not checks both, and reads SynthID, C2PA, and IPTC provenance when a file carries them.
Can I check an essay without uploading it anywhere?
Yes — native checks on iPhone and Mac never leave the device. GPTZero sends every submission to its servers to process it.
Related Comparisons
Keep comparing adjacent tools before you pick a workflow.
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.
Slop or Not vs Originality.ai
Originality.ai tracks every scan in a dashboard built for agencies, but there's no free tier — every check burns a credit at roughly 100 words apiece.
Slop or Not vs Copyleaks
Copyleaks plugs into seven different LMS platforms and even flags deepfake video, but the sentence-level detail and full reporting sit behind an enterprise account.
Slop or Not vs Winston AI
Winston AI bundles plagiarism checks and writing feedback with its AI verdict, but the free lite checker stops at 2,000 characters and the real trial runs out in 14 days.
Slop or Not vs Turnitin
Turnitin's AI-writing indicator is built into a workflow schools already trust, but there's no public version — access runs through a school subscription or not at all.
Slop or Not vs QuillBot
QuillBot folds its AI detector into a paraphrasing suite writers already use, but the free tier caps at 1,200 words a scan and six scans a day.
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.
