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 Copyleaks: AI Detector (2026)
GPTZero works for one teacher grading one class through Canvas or Google Docs. Copyleaks works for a school system that needs the same detector wired into seven different LMS platforms, plus the image and deepfake checks GPTZero doesn't attempt.
GPTZero is a text detector aimed at individual teachers and writers, with Canvas and Google Docs integrations and a free plan capped at around 10,000 words per month. Copyleaks is an enterprise suite that adds AI image and video detection, deepfake checks, and LMS integrations for Canvas, D2L Brightspace, Moodle, and others; free web scans run up to 25,000 characters without logging in. Slop or Not covers private on-device checks for text and images 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 | Copyleaks |
|---|---|---|---|
| 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 | Content integrity suite for education, enterprise, developers, and publishers |
| Text detection | Checks writing in the native app and online checker | AI Detector and Advanced AI Scan products | AI text detector with model coverage and multilingual support |
| 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 | AI Image Detector is listed in the AI Detector product menu |
| Deepfake detection | Covers deepfake and synthetic-image checks as image detection | No | AI Video Detector and Deepfake Detector are listed |
| 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 | AI Logic, AI phrases, source match, highlights, and reports are described |
| 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 | Browser extension and Google Docs add-on are listed |
| 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 | Enterprise AI detection via API 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 | LMS integration for Canvas, D2L Brightspace, Moodle, Blackboard, Schoology, Edsby, and Sakai is 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 | Free web scan limit is listed as up to 25,000 characters without logging in |
| 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 | Lists GDPR, SOC 2, SOC 3, PCI DSS, and NIST RMF references |
| 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 | Full sentence-level insights and enterprise integrations require account or paid workflows |
✓ = supported, ✕ = not offered, – = not publicly documented. Details reviewed June 2026 from public product, pricing, documentation, and benchmark pages.
Sources reviewed
Where Slop or Not Fits
GPTZero has no answer for a photo, and Copyleaks reserves its full report for an enterprise account. Slop or Not checks text and images in one personal app, no LMS contract and no enterprise tier required to see the whole result.
- 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.
Copyleaks
Use it for organizations that need content integrity controls across LMS, API, and browser workflows.
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 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.
GPTZero vs ZeroGPT
GPTZero brings classroom integrations and an API; ZeroGPT brings speed and a 15,000-character ceiling with no account needed.
GPTZero vs Originality.ai
GPTZero fits a teacher's free plan; Originality.ai fits a publisher's paid credit meter.
GPTZero vs Turnitin
GPTZero is self-serve with a free tier; Turnitin only exists inside a school's paid subscription.
Originality.ai vs Copyleaks
Originality.ai bills per credit for solo writers; Copyleaks bills enterprise accounts for LMS-wide integrity checks.
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.
