Undetectable
What it is
Overview
A dual-purpose tool that detects AI-generated text and rewrites content to evade AI detection systems. Built as a proprietary system rather than a wrapper on existing models. The 4 million monthly visitors skew toward students and content creators who need to either identify AI writing or make AI-generated content appear human-authored. The vendor claims 99% detection accuracy across ChatGPT, Claude, and Gemini outputs.
At a glance
Usability & Quality overview
Best for
- Users looking for minor text improvements
- Users who need a simple rephrasing tool
Watch out for
- Users who need reliable AI detection bypass
- Users who expect high-quality human-like output
Real product, not a wrapperIndependent product
This tool functions as a basic wrapper around existing AI detection and text paraphrasing services without offering proprietary technology, meaningful integrations, or workflow innovations that would differentiate it from direct API access.
Strong evidenceQuality score
Undetectable AI is a rephrasing tool that inconsistently bypasses AI detectors, with users reporting frequent failures and being outperformed by competitors.
Plans
Pricing
How free is free?
Trial only
250 words free trial; paid plans start at $5-10/mo
What you get for free
- 250 words for AI detection testing
- Access to AI content detection feature
Behind the paywall
- More than 250 words10K Words Monthly ($9.99/mo)
- AI humanization features10K Words Monthly ($9.99/mo)
- Monthly word allowances (10K-50K)Paid subscription
Community feedback
Aggregated reviews
Ratings and quoted comments below are aggregated from third-party sources and reflect those users' views, not SearchTools.ai's.
What reviewers talk about
themes inside the Sentiment pillar — not score ingredients
57Output Quality14 mentions
“I've had a positive experience so far. The tool is easy to use and has been helpful for my needs.”
“"Money back guarantee' means nothing, their service DID NOT work I ran everything through zerogpt to confirm. Now they won't refund. AVOID. I see that the company has subsequently reached out here. To be clear, their product did not work, they claim to have a money back guarante”
“Frustrated. You can't change a result as there is no prompt window to do so. If you need the essay to be 500 words or less, you can ask it but all it does is rewrite the actual sentence "Make this essay 500 words or less" then gives you a 700 word essay. Incredibly frustrating! T”
“Stay away from them! It’s a scam! I signed up for the 3 day “free” trial and canceled it within a few hours because what I got was word vomit that did not make any sense. I canceled it within a few hours and deleted my account but they charged me $60 the next day. When I contacte”
2Value & Pricing11 mentions
“Kein Abo abgeschlossen und dennoch wird monatlich Geld abgebucht. Trotz mehrfacher Kontaktaufnahme über den Kundenservice habe ich keine Rückmeldung bekommen. Ich werde die Unterlagen jetzt zum Anwalt geben. ”
“So i was charged twice i wanna say it worked okay but like everything went out the window once 135 dollars was taken out my account so lets fix that..”
“ABSOLUTE SCAM, they charge you before the trial is over, and when you ask for a refund they don’t provide it. I will be seeking legal action as they are an absolute abolishment of a company, well FAKE COMPANY!”
“"Money back guarantee' means nothing, their service DID NOT work I ran everything through zerogpt to confirm. Now they won't refund. AVOID. I see that the company has subsequently reached out here. To be clear, their product did not work, they claim to have a money back guarante”
66Support19 mentions
“I accidentally purchased the annual subscription, and the support team responded very quickly. They cancelled my subscription immediately and approved my refund request. Their customer service was kind, professional, and understanding throughout the process. Thank you, Ava, for y”
“Kein Abo abgeschlossen und dennoch wird monatlich Geld abgebucht. Trotz mehrfacher Kontaktaufnahme über den Kundenservice habe ich keine Rückmeldung bekommen. Ich werde die Unterlagen jetzt zum Anwalt geben. ”
“I had a misunderstanding regarding my subscription, so I contacted the support team for assistance. Ava was incredibly patient, professional, and understanding throughout the entire process. She took the time to listen to my concerns, answered my questions clearly, and escalated”
“Ava was very helpful, professional, and kind throughout the entire process. She responded quickly, answered all of my questions, and kept me updated every step of the way. I really appreciate her assistance and excellent customer service.”
60Trust derived from dimensions + predator detectionview math
A composite of the quality dimensions weighted by mention volume, then capped by predator / abuse-detection rules.
Reasoning
Capabilities
Key features
Content Detector
Analyzes text to estimate whether it was written by a human or AI
Detector
Identifies whether content was AI-generated by analyzing text or media signals
Writing Assistants
Helps you draft, edit, and polish written content across many formats
Plagiarism Checker
Scans text against sources to detect copied passages and flag originality issues
The honest take
What users love & flag
Distinct themes surfaced across 4 reviews from 1 source — each grounded in real review text, ranked by how often it comes up.
Questions
Frequently asked
What is Undetectable?
Undetectable is a dual-purpose AI tool that both detects and humanizes AI-generated content with 99% accuracy. It can identify text created by major AI models like ChatGPT, Claude, Gemini, and others, while also transforming AI-generated content to appear more human-like and bypass detection systems.
Is Undetectable free?
Undetectable offers a free trial limited to 250 words. After that, paid plans start at $5 per month (when billed annually) for 10,000 words, with options up to 50,000 words for $21.25 monthly. All paid plans include unlimited AI detection and humanization features.
Which AI models can Undetectable detect?
Undetectable can detect content generated by ChatGPT, GPT-4, GPT-5, Claude, Gemini, and Llama. It also identifies paraphrased or rewritten content from tools like QuillBot and Grammarly by analyzing linguistic patterns, semantic structures, and writing styles.
How do I use Undetectable's AI detector?
Simply paste your text into the detection interface or upload a file, then click 'Check for AI' to receive instant results. The tool analyzes your content and shows probability scores from multiple AI detection systems simultaneously. You can also install their Chrome extension to check content directly on websites, Google Docs, and social media.
What is the humanization feature in Undetectable?
The humanization feature transforms AI-generated text to pass detection systems while maintaining readability and original meaning. It includes writing level matching, watermark removal, and ensures the content appears naturally human-written rather than AI-generated.
How accurate is Undetectable's AI detection?
Independent studies published in peer-reviewed journals show Undetectable achieves 99% accuracy in AI detection with zero false positives on human-written content. Forbes rated it as the number one AI detector, and it consistently outperforms competitors like Originality.ai and GPTZero.
What languages does Undetectable support?
Undetectable supports over 50 languages for both AI detection and content humanization. This allows users to verify content authenticity and humanize AI-generated text across diverse linguistic contexts with the same reliable accuracy.
Does Undetectable offer business solutions?
Yes, Undetectable provides custom business pricing with non-expiring credits, white labeling options, and priority support. Business plans also include API access for enterprise integration and bulk scanning capabilities for organizations processing large volumes of content.
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