Copyleaks vs Undetectable AI (2026): Pricing, Features & Which to Choose

Who comes out ahead

Based only on the facts in our directory. The right pick still depends on the job you need done.

Lower starting price
Not comparable
Not comparable: Undetectable AI does not list a price
Free plan
Tie
Both have one
Higher rating
Copyleaks
4.2 against 3.2
Same job?
Yes
Both are Writing tools

Side by side

Compared on	Copyleaks	Undetectable AI
Our rating	4.2Better	3.2
Starts at	$9.99/mo	Free
Free plan	Yes	Yes
Category	Writing	Writing
Plans	From $9.99/mo	Free
Key features	Combined plagiarism and AI-content detection in one scan Multi-language support across dozens of languages Image-based AI detection alongside text scanning Credit-based usage model covering roughly 250 words per credit Browser extension and API for embedding checks into other workflows	AI text detection with flagged sections Image, audio and video AI detection Fake PDF detector AI humanizer that rewrites to evade detection Paraphrasing, plagiarism checking and Chrome extension
Pros	Combines plagiarism and AI-detection in one subscription instead of two tools Free tier gives enough monthly pages to test before paying Long operating history since 2015 in the plagiarism-detection space specifically	Detection across image, audio and video, not just text Fake PDF detection targets a real and growing fraud problem Free tier available before any payment
Cons	Credit-based pricing gets confusing to estimate for high-volume users AI-detection accuracy claims face industry-wide skepticism, not unique to Copyleaks Enterprise and education pricing is hidden behind a sales quote	Ships a humanizer for evading detection, with students among named users Submitting rewritten work is academic misconduct at most institutions No pricing figures published on the landing page
Company	Copyleaks, founded 2015	Undetectable Inc.

Prices come from each vendor's pricing page, last checked 20260814. Check the vendor before you buy.

FAQ

Questions people ask

Is Copyleaks better than Undetectable AI?

In our reviews Copyleaks scores 4.2 and Undetectable AI scores 3.2. The better pick depends on the job. Copyleaks: Copyleaks scans text and images for plagiarism and AI-generated content across dozens of languages for schools and businesses. Undetectable AI: Detects AI content across text, image, audio and video, and also rewrites text to evade detection.

Which is cheaper, Copyleaks or Undetectable AI?

Copyleaks: from $9.99/mo. Undetectable AI: free.

Do Copyleaks and Undetectable AI have free plans?

Yes, both have a free plan.

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