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 Image Detector
Slop or Not vs Sightengine: AI Image Detector (2026)
Sightengine is the right call for a developer wiring AI-image moderation into an app: API keys, C2PA and EXIF checks built in, a free tier capped at 2,000 operations a month. None of that helps someone who just wants to check one photo before sending it. Slop or Not does that on iPhone or Mac, free, right on the device.
Sightengine is a developer API for visual moderation: AI-generated image detection, deepfake and face-swap checks, a C2PA checker, and an EXIF metadata viewer, all behind an API key. The free tier caps out at 2,000 operations a month and 500 a day. It doesn't check text. Slop or Not checks both text and images on your iPhone or Mac, on-device, with no API key required.
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 | Sightengine |
|---|---|---|
| Best fit | On-device iPhone and Mac checks or free browser checks for text and images | Developers adding AI media detection and moderation through an API |
| Text detection | Checks writing in the native app and online checker | No Sightengine is image-only; it doesn't detect AI-generated text |
| Image detection | Checks photos, synthetic images, and provenance clues in the app or online checker | AI Image Detection is listed for detecting AI-generated images |
| Deepfake detection | Covers deepfake and synthetic-image checks as image detection | Deepfake Detection is listed for face swaps and AI manipulation |
| Metadata and provenance signals | Reads SynthID, C2PA, and IPTC signals in native and online image checks when a file carries them | C2PA Checker and EXIF & Metadata Viewer are listed |
| 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 | API model capabilities and operation counts are documented |
| Browser checker | Free online checker runs in any browser on Numen's private Mac server; submissions are deleted after processing | Not publicly clear |
| 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 | API documentation and API keys are listed |
| Classroom workflow | Useful for checking student writing on-device in the app or through deleted-after-processing online checks | 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 tier lists 2,000 operations per month with a 500 per day maximum |
| 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 policy covers subscriber-submitted data sent to the API for analysis, and its security page says Enterprise customers can request immediate deletion after processing; the default retention period on other plans is not stated |
| Main limitation | On-device privacy requires iPhone or Mac; browser checks run on Numen's private Mac server, not on-device | API-first tool; paid plans meter operations |
✓ = 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 Sightengine, images, video, and text you submit to its API are processed for moderation and analysis, along with account and billing data. Enterprise customers can request immediate deletion after processing, per its security page; the default retention period on other plans is not stated. See the Sightengine 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
Sightengine meters every check against a 500-a-day operation cap through its API. Slop or Not needs no API: check the photo on-device and move on.
- 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.
Sightengine
Use it for developers adding visual moderation and AI media checks to an app.
Common Questions
Does Sightengine detect AI-written text?
No. Sightengine is built for visual moderation: images, deepfakes, and metadata signals. Slop or Not checks both text and images.
Do I need a developer account to use Sightengine?
Yes. Every check runs through an API key, even on the free tier. Slop or Not needs no account: open the iPhone or Mac app or use the free online checker.
Which one fits a single photo check better?
Slop or Not. Sightengine is built for apps processing images at scale behind an API; Slop or Not is built for one person checking one photo on their own device.
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.
