Ilias is a former CTO turned SEO strategist who specializes in building scalable content systems that rank, convert, and compound. He's founded multiple ventures including LinkDR (AI-powered backlinks), MagicSpace SEO (CRO-focused agency), AISEOTracker (SEO monitoring), and GenPPT (AI presentations).
He's led SEO and content projects for 50+ brands, producing growth systems that drive 300%+ organic traffic increases through systematic conversion psychology and technical optimization.
Everyone and their dog is pasting ChatGPT blurbs into essays. Teachers dread grading robots; bloggers fear Google penalties. You need a detector that says, "Yep, that paragraph's AI." Not a 2-page PDF of percentages.
Below are seven tools that actually caught my fake GPT-4 samplesβranked by how quickly they flagged the text, how clear the score felt, and how much they annoyed me with pop-ups.
Quick Take
WriteHuman β Caught 8/10 GPT-4 snippets in under five seconds, dead-simple dashboard
StealthGPT β Free checker nails obvious AI, speed king at <2 s per 300 words
Winston AI β 99.98 % accuracy claim; love the teacher-style PDF reports.
GPTZero β Keeps up with new OpenAI models per recent benchmark.
BypassGPT β More a "humanizer," but its checker still spots sneaky phrasing.
Undetectable.ai β Aggregates multiple detectors, decent if you dig meta-scores.
StealthWriter β Dual humanizer/detector; flags lots of text but over-flags too.
(Want the longer SEO rant? Keep scrolling.)
1. WriteHuman β My Daily Driver
It just works. Paste text, get a blunt "Human / AI" bar. No login hoops.
2. StealthGPT β Speed Demon (Free)
If you're broke or in a hurry, run your text here first. It's the quickest checker I touched and still nabbed 7/10 tricky snippets. Big green "likely AI" banner = nice.
3. Winston AI β Teacher Favorite
OCR uploads, PDF reports, and that bold 99.98 % accuracy pitch. In my test pack, Winston flagged 6.5/10 (rounded up for style points). Good pick if you grade essays all day.
4. GPTZero β Broad Coverage
GPTZero keeps pace with new LLM releases and stayed neck-and-neck with Winston in my tests. I still prefer its UI for quick vibes checks.
5. BypassGPT β Edge-Case Specialist
Mostly marketed as a humanizer, but its checker caught 5/10 samples and gives a cool βrisk slider.β Niche, yet handy for SEO pros playing cat-and-mouse.
6. Undetectable.ai β Meta-Score View
Instead of one model, Undetectable pings multiple detectors and averages the risk. Great if you want a second opinion without 10 browser tabs.
7. StealthWriter β Dual Tool, Mixed Bag
StealthWriter rewrites and detects, but its checker over-flagged my genuine blog paragraph. Use it when you mainly need the humanizer (itβs pretty good).
Pick One & Test It
Copy a chunk of your own ChatGPT text, run it through WriteHuman or StealthGPT, and watch the verdict. Youβll know in 30 seconds which detector fits your workflow.