Copyleaks Review 2026: AI Detection + Plagiarism in 100+ Languages
Copyleaks is an AI-content detector and plagiarism checker used by schools, publishers, and businesses to verify whether a piece of text was likely written by a model and whether it copies existing work — in one combined report. Like GPTZero and Originality.ai, it targets the "was this AI-written?" question, but it leads with multilingual breadth: AI detection in 30+ languages and plagiarism matching in 100+. This review was compiled by our editorial team with AI-assisted research; pricing reflects 2026 data from copyleaks.com and independent trackers.
What Copyleaks does
- Unified AI + plagiarism scan — one report flags both AI text and copied passages.
- AI image detection — included in the same credit pool.
- Sentence-level highlighting — pinpoints the phrases most likely to be machine-generated.
- Cross-language plagiarism — catches text translated from other languages.
- Browser extension + Google Docs add-on, plus a documented API with a free sandbox.
- LMS integrations — Canvas, Moodle, D2L, Schoology, Sakai, Blackboard.
Copyleaks pricing (2026)
Copyleaks is credit-based: 1 credit scans up to 250 words.
| Plan | Price | Includes |
|---|---|---|
| Personal | $16.99/mo ($13.99/mo annual) | 1,200 credits/mo (~300k words), AI + plagiarism + image detection |
| Pro | $99.99/mo ($74.99/mo annual) | 25 seats, 12,000 credits/mo (~3M words), website scanning, analytics |
| Enterprise / Education | Custom | LMS integration, governance, dedicated support |
There is no free plan or trial shown on the pricing page. Refunds are only considered within the first 10 days of a billing cycle and only if no credits were used. A few trackers list a cheaper "AI Content Detector" sub-plan, but the vendor's own page lists Personal from $13.99/mo annual as the entry point as of late 2026.
Pros and cons
Pros
- AI detection and plagiarism in a single report across many languages.
- Public, documented API with a free sandbox for developers.
- Strong LMS coverage for education.
Cons
- Credit model means long documents burn credits quickly (1 credit = 250 words).
- No free trial; strict refund window.
- Pro jumps to $99.99/mo (25 seats) with nothing in between.
Accuracy, honestly
Copyleaks claims ~99.5% accuracy, but independent 2026 tests put real-world results in the 76–91% range — meaning false positives and false negatives are both possible. Treat a single score as a strong signal, not a verdict, especially for academic-integrity decisions. For a head-to-head on detectors, see our GPTZero vs Originality.ai vs Turnitin guide and the broader best AI content detector roundup.
Verdict: 4.1/5. Copyleaks is a capable, multilingual AI-and-plagiarism detector for institutions and publishers. The credit model and no-trial policy are the main friction; for evasion-focused needs, pair it with Undetectable AI only where policy permits.
Copyleaks is a trademark of Copyleaks; GPTZero, Originality.ai, Undetectable AI, and other product names are trademarks of their respective owners. CNPulse is not affiliated with any tool reviewed on this site. This is independent editorial content, not sponsored.