Here are the 11 best and most popular (not sure best) AI checkers I want to test: (How did I check popularity? I simply used SEO tools to estimate their traffic and sorted them by that. If any AI detectors are missing here, it’s because they don’t work, users don’t like them, or they’re not investing in marketing, haha, so… sorry!) If you want to avoid high detection and humanize ai content - read my tutorial How to Humanize AI & Best AI humanizers Best AI Humanizers with proofs reviewed here: https://www.reddit.com/r/DataRecoveryHelp/comments/1oqwdib/best_ai_humanizer 🎁 If you need to Humanize AI right away try this: https://aihumanizer.net - 100% Free Ai humanizer (nice human score in ZeroGPT & GPTZero, simple language) https://www.zerogpt.com/ - ZeroGPT Checker (My top choice. Easy to fool when you rewrite content in a conversational style.) https://gptzero.me/ - GPTZero AI Detector (Very inconsistent results. Since the September update it has become unstable - some texts score 0%, others 100% AI, with no clear logic.) https://quillbot.com/ai-content-detector - Quillbot AI Checker (Works fairly well. Can be fooled by using natural language and avoiding a rigid, formal tone.) https://www.scribbr.com/ai-detector/ - Scribbr AI Detector (Just an iframe of Quillbot’s checker.) https://www.grammarly.com/ai-detector - Grammarly AI Checker (Very weak detector, easy to trick.) Less popular AI detectors: https://originality.ai/ai-checker Originality AI Checker (Feels scammy. Almost always shows 100% AI, but if you add intentional errors it marks them as human. Very odd.) https://undetectable.ai/ Undetectable AI Detector https://decopy.ai/ai-detector/ Decopy AI Detector https://notegpt.io/ai-detector NoteGPT AI Detector https://copyleaks.com/ai-content-detector Copyleaks AI Detector https://gowinston.ai/ Winston AI Detector I would not review each pros and cons and plans intentionally. Who cares? You can look yourself. I will only get scores before and after and share with you. Reddit allows you to attach only one image per post, so, sorry! What AI detector do colleges & students use? It’s definitely Turnitin AI Checker. There’s no free way to check it without registration. I tried, and it asked whether I’m a student, instructor, or teaching assistant. I didn’t want to lie, so I quit. But I’ve read a lot of Reddit discussions, and both students and teachers give the same answer to the question: “How accurate is Turnitin AI Detector?” The simple answer: Not accurate. Haha! Lots of false positives and easy to manipulate with special prompts. Ok let’s do a simple test of the rest popular best AI detectors and checkers: For this test, I’ll generate a simple essay titled “What is an AI Detector and How Do They Work?” (500 words). Then I’ll show you the score before and after some basic humanization using simple prompts.I’m intentionally skipping web-based AI humanizer tools because I already covered those in this tutorial.I’ll use ChatGPT 4.1 Mini – fast and cheap. I assume a lot of writers and students might be using this specific model. More on reddit.com

These "AI detectors" work by looking for high "perplexity," which is the presence of relative randomness in the text, in some relevant sense. What I've found is that "perplexity" is strongly negatively correlated with clarity. If you feed in some typical freshman English crap, they'll say it likely wasn't written by an AI, because it's confused rambling nonsense. If you feed in an Isaac Asimov science article, it's going to say an AI wrote it, because Asimov is (famously) able to write clear, coherent articles based on the organized thoughts of a powerful mind. The ability to write well is less common than it used to be, but I certainly hope we aren't headed for a future where we not only tolerate, but actually require students to write badly, in order to get past the AI detector. There's also a difference between using AI as a super-advanced version of the Microsoft Word grammar checker, and using it to actually provide the content of the assignment. The latter is plagiarism (or at least some form of cheating); the former is not. But the AI detector tools seem to be mostly targeting the former. More on reddit.com

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Detectors analyze sentence structure. AI has a pretty predictable cadence in its structure and wording (verbose) which is what the detectors look out for. One key thing to keep in mind is that school isn't a court of law, meaning offenses don't have to be proven beyond a reasonable to be punished for them. Probable cause and reasonable suspicion is usually all that is needed. More on reddit.com