Undetectable AI detects AI text and images and humanizes writing. Plans start at $5/mo billed annually, with a 250-word free trial. Read the full review.
Researched and fact-checked by Bartu Cavusoglu · Updated October 26, 2026
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Undetectable AI is a web platform that combines an AI text detector, an AI humanizer and an AI image detector. The company describes it as a way to work with AI-assisted content more confidently, bringing detection, rewriting and refinement into one place instead of several separate apps.
It was created by Christian Perry, who says he saw in January 2023 that most AI-generated content felt robotic and was easy to detect. The site claims more than 24 million users and a Forbes rating as the best AI detector, though Gappsy has not independently verified either claim.
You paste text or upload a file, up to 5,000 words per check on the homepage, and the detector analyzes it the way an AI detector would. It identifies which sentences are likely to be flagged as AI-generated so you can see exactly where the problems are before you submit or publish.
The humanizer then rewrites those sections by varying sentence structure, enriching vocabulary and adjusting tone. The company says processing typically takes 10 to 30 seconds per document, and that it has tested its output against AI detectors and found it flags as human. Those results are the company's own.
The core tools are the AI detector, the humanizer and the AI image detector, which gives an instant read on whether a picture was made by AI. The wider suite adds a paraphrasing tool, AI essay writer, AI SEO content writer, plagiarism checker, Human Typer and AI Job Applier, plus detectors for voice, video, PDFs, receipts and IDs.
A Chrome extension carries detection, humanizing and paraphrasing into Google Docs, Gmail and other webpages. Language support covers more than 50 languages, with English offering the highest accuracy. The company also lists an API and a refund guarantee if output is flagged by a detector.
Undetectable AI is a web platform that detects AI-generated text and images and rewrites AI text so it reads as human. It also offers a paraphrasing tool, essay writer, SEO writer and a Chrome extension.
Paid plans start at $5.00 per month billed annually ($60.00 per year) for 10K words per month. Higher tiers are $9.50, $15.75 and $21.25 per month for 20K, 35K and 50K words. Business pricing is custom.
Yes. The site says you can start free and try the core tools without paying. The free trial is limited to 250 words, and additional usage requires a paid plan.
The company names students, educators, professionals, content writers, bloggers, marketers, SEO professionals, researchers and business owners. It suits people who regularly produce or review AI-assisted writing.
Yes. The tools support more than 50 languages, including Spanish, French, German, Arabic, Hindi, Japanese and Chinese. English is the primary focus and offers the highest accuracy.
Yes to both. The Chrome extension works on Google Docs, Gmail and other webpages. The API is described as available for early adopter testing, with personal use and redistribution plans.
If output is detected by an AI detector, users can email the document and where it was flagged to contact@undetectable.ai. The company says it will refund the cost of the generation.
The company says user text is never sold and that Business Solutions include stricter data-retention controls for teams. Buyers with strict compliance needs should confirm details with the company.