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 Scribbr: AI Detector (2026)
Scribbr's free, no-sign-up detector is the fast option for a short paragraph, but it's tuned to catch GPT-3.5-class writing — GPT-4 and Gemini need the paid check. Slop or Not applies one detection model to every submission, free, with no per-document word cap and no model tier to upgrade into.
Scribbr offers a free no-sign-up AI text detector aimed at students and educators, with paragraph-level feedback and up to 1,200 words per submission. The detector runs on QuillBot's engine; Scribbr and QuillBot are both Learneo products. The free tier covers GPT-3.5-class text; detecting GPT-4 or Gemini output requires the paid check. Slop or Not checks AI-generated text and images on your iPhone or Mac with no per-document word cap in the native app.
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 | Scribbr |
|---|---|---|
| Best fit | On-device iPhone and Mac checks or free browser checks for text and images | Students and educators who need a free text check |
| Text detection | Checks writing in the native app and online checker | Free AI detector with average accuracy for GPT-3.5-class text; premium tier covers GPT-4, Gemini, and Copilot |
| Image detection | Checks photos, synthetic images, and provenance clues in the app or online checker | No |
| 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 | Paragraph-level feedback and AI-generated, AI-refined, and human-written categories are listed |
| Browser checker | Free online checker runs in any browser on Numen's private Mac server; submissions are deleted after processing | No-sign-up browser checker |
| Native Apple app | Native iPhone and Mac app for on-device checks; browser users can use the free online checker | No |
| API workflow | Pro Mac app includes a local CLI and MCP server; no public hosted API | Not publicly clear |
| Classroom workflow | Useful for checking student writing on-device in the app or through deleted-after-processing online checks | Student and educator use cases 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. | Unlimited free checks with up to 1,200 words per submission |
| 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. | States submissions remain private and are not stored or shared |
| Main limitation | On-device privacy requires iPhone or Mac; browser checks run on Numen's private Mac server, not on-device | Text-only checker with up to 1,200 words per submission |
✓ = 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 Scribbr, your uploaded document is submitted to its AI Detector or Plagiarism Check, along with account and payment data. Retention depends on the tool: its Turnitin-backed Plagiarism Check stores documents under Turnitin's retention terms, which can be long-lived, so check its privacy policy before uploading. See the Scribbr 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 upgrade needed to catch GPT-4 or Gemini writing: Slop or Not runs the same model on every check, free, 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.
Scribbr
Use it for students and educators who want a no-sign-up text check.
Common Questions
Does Scribbr's free tier catch GPT-4 writing?
No — Scribbr's free tier only catches GPT-3.5-class writing; GPT-4, Gemini, and Copilot output need the paid check. Slop or Not applies one detection model to everything you check, free.
Which one is better for checking a long document?
Slop or Not — the native app has no per-document word cap on iPhone or Mac. Scribbr's free tier caps each submission at 1,200 words.
Does Scribbr check images?
No — Scribbr is a text-only detector. Slop or Not checks both AI-generated text and images, including SynthID, C2PA, and IPTC provenance reads.
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.
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.
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.
