Copyleaks vs Undetectable.ai
Copyleaks scores higher overall, 3.7 against 2.7 of 5.0, and leads in 6 of the six categories to 0. Which matters depends on the categories you weigh most.
Independently evaluated by huby · 2026-10-22 · scores free to read and cite
Overall scores
Category by category
A category is won on the higher score. Equal scores are counted for neither.
What the evaluation found
Copyleaks
Strongest category: Use Cases & Pricing
Copyleaks is designed for flexibility, integrating its detection capabilities directly into its customers' existing workflows through plugins for educational platforms, Microsoft Word, and Google Docs. This adaptable approach extends to its commercial strategy, which uses a credit-based system that allows users to pay for what they use rather than being locked into rigid tiers. For large organizations, the platform offers extensive customization, from deployment in a private cloud to developer tools that allow the service to be built into a company's own software.
Copyleaks Research Brief, $35 →Undetectable.ai
Strongest category: Quality
Undetectable.ai demonstrates highly inconsistent performance, excelling at identifying simple, unedited AI or human writing but struggling significantly with more complex material. In controlled huby testing, the tool correctly identified all purely human-written documents but failed to flag two-thirds of AI-generated text that was edited or designed to be evasive. This performance gap extends to its rewriting feature, where the paid version can bypass some detectors while the free version is completely ineffective.
Undetectable.ai Research Brief, $35 →Go deeper on either one
The scores above are free. A Research Brief adds every subcategory scored, the assessment behind each one, and who should consider it - six pages, in the shape a buying decision actually needs.
Common questions
Is Copyleaks or Undetectable.ai better?
On huby's independent evaluation, Copyleaks scores 3.7 against 2.7 for Undetectable.ai, and leads in 6 of the six categories. Neither is better at everything - the category table above shows where each one leads.
How are Copyleaks and Undetectable.ai scored?
Both are evaluated against the same framework, on the same 1.0-5.0 scale, from evidence tiered by source. The scores were published 2026-10-22. huby takes no payment to change a score or a rank.
How many AI detectors has huby evaluated?
9 text detectors, all against the same framework, which is what makes these two comparable at all.
What do I get that is not on this page?
This page is free and always will be: both overall scores, all six category scores and a verdict. A Research Brief adds the subcategory scores, the written assessment behind each one, and who should consider the product.