Slop or Not Help & FAQ

Slop or Not is an AI content detector for text and images. The iPhone and Mac app checks content on-device, so your text and photos stay on your device. The website also has a free online photo checker for quick image checks in any browser. Online submissions are processed on Numen's private Mac server, never shared with third-party AI APIs or detector vendors, and deleted after processing.

You can check content in the app or on the web:

• Check text in the app: Copy the text you want to analyze, open Slop or Not, and paste it into the text field. The app checks it on-device.
• Check images in the app: Select any image or photo from your library, or share an image from another app to Slop or Not. The app checks it on-device.
• Check text and photos online: Use the web checker for English text or a suspicious photo in any browser. Online checks run on Numen's private Mac server, are not shared with third-party AI services, and are deleted after processing. Open the AI detector.

The iPhone and Mac app performs AI detection directly on your device. You need an internet connection for the one-time setup that downloads the AI models. After that, you can check text and images in the app offline. We use Apple's CoreML model encryption to protect our on-device transformer models, so your device may occasionally need an internet connection to refresh model encryption keys from the App Store. The online photo checker needs an internet connection because it sends each submission to Numen's private Mac server for analysis. We do not pass online submissions to third-party AI services, and we delete them after processing.

Yes, but the privacy model depends on where you check. In the iPhone and Mac app, Slop or Not processes text and images locally, and your content never leaves your device. Unlike many online content detectors, the web checker does not pass your photo to a third-party AI service or detector vendor. It goes to Numen's private Mac server for analysis and is deleted after processing. We're based in the EU and comply with GDPR and CCPA.

Use Slop or Not whenever a cloud detector is the wrong place for the content you need to check. It is especially handy for:

• Students & Teachers checking for originality in academic work.
• Journalists & Fact-Checkers verifying the authenticity of sources and images.
• Online Daters spotting fake “catfish” profiles.
• Shoppers checking if product reviews are real or AI-generated.
• Anyone wanting to identify misinformation and deepfakes on social media.

Our internal tests measure accuracy by content type:

• Watermarked Images (C2PA/IPTC from Gemini image generation, OpenAI image generation, Microsoft Designer, Adobe Firefly, etc): 100% accurate detection.
• All other AI-generated images: 90% accuracy.
• AI-generated text: 95% accuracy in our internal tests, and independently scored on RAID, the public AI-text-detection benchmark: 99.5% of AI text caught at a 5% false-positive rate, adversarial attacks included (top 10 of 39 detectors as of August 2026).

*Note: Image accuracy is based on our internal tests. Text detection is also validated on the public RAID benchmark. Results can vary with new AI models and advanced methods designed to trick detectors.*

Read the full RAID benchmark results

AI-generated text often contains hidden characters or weird formatting that can act as invisible watermarks. Our Text Cleanup feature removes these traces with a single tap. It removes: hidden characters (like zero-width spaces), suspicious punctuation and homoglyphs (letters that look like others). It can also normalize spelling (e.g., from US to UK English) and fix punctuation for you.

When you check text in Slop or Not, the app shows a readability score next to the AI result. The formula depends on the language. English uses Flesch Reading Ease and Flesch-Kincaid Grade Level; German uses Wiener Sachtextformel; Spanish uses Flesch-Szigriszt; Italian uses GULPEASE; Swedish, Danish, and Norwegian use LIX. That works across seven languages today, with more planned. Readability tells you how hard the text is to read, not who or what wrote it. The result is an estimate, so use it as a quick gauge. The score is still available when language detection confidence is low, as long as the app identifies a supported language.

They are fun iMessage sticker packs included with the app! When you find AI-generated content online or in chats, you can use our stickers to call it out in a lighthearted way.

Turn on Incognito Mode when you don't want a check to appear in the app's history. The content still stays on your device; the app simply leaves no local history entry.

The agentic AI Humanizer skill lets Claude, Codex, Hermes Agent, OpenClaw, Cursor, Gemini CLI, or OpenCode rewrite a draft with a five-pass workflow. It works without Slop or Not for core rewriting and voice matching. When Slop or Not is installed on Mac with Pro active, it supplies the on-device AI detector, readability, Text Cleanup, and cleanup stats through its CLI or MCP server.

Start with the install guide, the CLI guide, the MCP guide, or the voice-matching guide.

Yes, if you provide a writing sample. The skill can extract a style fingerprint for register, sentence rhythm, contractions, hedges, and paragraph shape. It should use style traits only, not private facts from the sample.

Yes. The slop CLI and slop mcp server are Pro features in the Mac app. The agentic AI Humanizer skill can still run its full five-pass rewrite workflow and voice matching without Pro, but on-device AI detector scoring, readability, Text Cleanup, and cleanup stats require Pro.

Slop or Not detection, readability, cleanup, and image checks run on your Mac. Rewriting happens in the AI assistant you choose, such as Claude, Codex, Hermes Agent, OpenClaw, or Cursor. If that assistant is cloud-based, its own privacy policy applies to the rewrite and to any voice sample used for fingerprint extraction.

No. Slop or Not returns a probability verdict, not a guarantee. The CLI, MCP server, and agentic AI Humanizer loop are quality-control tools that help you inspect and revise drafts. Results can vary with short samples, new models, and heavy human editing.

GPTZero and Originality.ai are cloud AI-content suites that people often use from a web dashboard. Slop or Not focuses on local checks on iPhone and Mac. The new CLI and MCP server let your existing AI assistant use the local Slop or Not score instead of sending every check through another web humanizer workflow.

We keep the App Store download small so it is faster and takes up less space. The detection models arrive through Apple's On-Demand Resources the first time you open Slop or Not. Usually, that is the only download. Apple's service can occasionally interrupt it, though. Check your connection, wait a few minutes, and reopen the app. The download should pick up where it left off.

Yes. When you use a low-resolution thumbnail or a screenshot, the model still runs but may return a lower confidence score because fine details are lost during our normalization step. Always try to use the original or highest-quality version of the picture. More pixels mean more clues for the detector, so results are stronger and more stable.

The text detector needs at least two full sentences to work. Very short snippets give too little context for the model to spot AI fingerprints. Whenever possible, paste a whole paragraph or the entire document. The longer the passage, the higher the detection confidence.

New AI models and deliberate evasion methods can be harder to detect. We update our models as those methods change.

• The image you checked might be a low-resolution thumbnail or a heavily compressed screenshot. Try again with the highest-resolution version available.
• The text sample could be too short. Make sure you provide at least two sentences; more text improves the results.

These checks solve most false-negative reports. If it still happens, send us the example. It can help improve a future model update.