Starting price
$9.99/mo
Free tier
250 words
Founded
2022
What Undetectable AI does
Undetectable AI is a humanizer tool. Frequently cited as a top-tier performer against GPTZero and Originality.ai, though results vary by source text length and topic.
Pricing: $9.99/mo for the entry tier; higher tiers scale by word volume.
Bundled AI detector: Yes — built-in AI detector included
Strengths and weaknesses
What works
- Runs output against multiple detector models before returning it
- Supports long-document processing without manual chunking
- Adjustable readability and purpose settings (story, essay, article, email)
- Wide model coverage — detects and rewrites GPT, Claude, Gemini, and Llama output
What to watch for
- Pricing scales quickly for high-volume users
- Heavier rewrites can drift from the original meaning if not reviewed
- Support has a reputation for slow response times per user reviews
Our verdict
Undetectable AI is best for: Teams that want one tool to both check and rewrite content across multiple AI models.
Who Undetectable AI is (and isn't) right for
Based on our testing notes, Undetectable AI fits users whose top priority matches its core design. Frequently cited as a top-tier performer against GPTZero and Originality.ai, though results vary by source text length and topic. If your priority is a different tradeoff — price, bundled features, or language coverage — one of the alternatives below may fit better.
Frequently asked questions
Is Undetectable AI free to use?
Undetectable AI offers a free tier of 250 words before you need to sign in or upgrade.
Does Undetectable AI include an AI detector?
Yes — built-in AI detector included.
How much does Undetectable AI cost?
$9.99/mo for the entry tier; higher tiers scale by word volume.