Copyleaks review

Copyleaks builds an AI content and plagiarism detector aimed at agencies, publishers, hiring teams and schools that need to check whether a document was AI-written, plagiarized, or both, across more languages than most competitors bother supporting. It runs as a web dashboard, browser extensions for Chrome, Edge and Firefox, a Google Docs add-on, and an API, and its biggest differentiator in this category is reach: AI detection in 30-plus languages, plagiarism detection in 100-plus, and a live Canvas LMS partnership announced in June 2026 that puts it inside classrooms as a grading tool, not just a web app. Pricing is the one place Copyleaks is genuinely hard to pin down. Its own pricing page showed no dollar amount when we checked it twice in October 2026, so every figure below is third-party sourced. Trustpilot rates it 2.6 out of 5 from 385 reviews as of October 2026; G2 and Capterra both rate the same product well above 4 out of 5.

What Copyleaks is for

The core product is a dual checker: run a document through and get both an AI-generation score and a plagiarism match report, with support for 30-plus languages on the AI side and 100-plus on the plagiarism side. That split matters for a publisher or agency reviewing content from freelance writers across different markets, where a single-language detector misses most of the submissions. An MCP connector lets AI agents call the detection API directly, a feature Copyleaks shares with Pangram but not with most of the rest of this category. The institutional side is the other half of the pitch: a June 2026 Canvas partnership plus named integrations for Moodle, D2L, Blackboard, Schoology, Sakai and Edsby put Copyleaks inside grading workflows at the point where an instructor already reviews a submission, rather than as a separate tool teachers have to remember to open.

What you get on each plan

On the cheapest paid plan, that works out to $4.66 per 100,000 words checked on annual billing, or $5.66 per 100,000 words checked on monthly billing (both third-party figures, not vendor-confirmed). For comparison, GPTZero’s annual-billed Premium plan works out to $4.33 per 100,000 words, and Originality.ai’s Pro plan runs $6.48 to $7.48 depending on billing term. The full side-by-side sits in Best AI Detectors in 2026.

The pricing page problem

Copyleaks’ pricing page doesn’t show dollar prices, as of October 2026, confirmed on two separate checks. The numbers above come from a single third-party pricing-tracking site, not cross-confirmed by a second independent source and not verified against Copyleaks’ own primary page. That’s a real transparency gap for a buyer comparing tools on price: the other seven detectors in this comparison all list at least their headline prices on their own pricing pages. If the exact monthly cost matters to your budget, treat the figures here as a starting estimate and get a live quote before committing.

Accuracy: vendor claim vs. independent test

Copyleaks doesn’t publish a specific accuracy percentage on its own site, but third-party coverage describes the vendor’s marketing as implying accuracy near 99%. Scribbr ran its own independent comparison across 12 AI detectors and measured Copyleaks at 66% accuracy, a gap large enough to treat as the headline number rather than a footnote. Scribbr also sells a competing free AI detector, which makes it a semi-independent source rather than a neutral academic one, but no fully independent, Copyleaks-specific benchmark exists, as of October 2026.

Zoom out and a category-wide caution applies here too. The Stanford/Liang TOEFL study, still the most-cited independent test of commercial AI detectors through 2026, found a 61.3% average false-positive rate across seven detectors run against real essays written by non-native English speakers. Copyleaks wasn’t one of the seven in that specific study, and no published non-native-English false-positive rate for Copyleaks turned up anywhere we could find, so there’s no vendor-specific data to weigh against that broader finding. Any AI detector, Copyleaks included, works better as one input into a human decision than as the decision itself, especially when the writer being checked isn’t a native English speaker.

What users say in reviews

Three review platforms tell different stories about Copyleaks. G2 puts it at 4.5 out of 5 from 41 reviews, Capterra at 4.4 out of 5 from 91 reviews, and Trustpilot at 2.6 out of 5 from 385 reviews, with 48% one-star. That’s a textbook case of a pattern seen across review platforms generally: Trustpilot tends to attract people who had a billing or cancellation problem, while G2 and Capterra lean toward people filling out a review while actively using the product. Reading only the flattering platforms would miss the recurring Trustpilot complaints: credits running out faster than expected, the same document returning a different AI score on a repeat scan, and personal names in a document getting flagged as AI-generated content.

Who should skip it

Anyone who needs a confirmed price before signing up should look elsewhere first or demand a quote; Copyleaks is the only tool in this category where that number simply isn’t published anywhere. A team that wants to test a detector for free before paying is better served by Originality.ai’s one-time 10,000-word check or GPTZero’s recurring monthly free tier. And anyone leaning on a single accuracy percentage to make a specific accusation, about Copyleaks or any detector, should read Winston AI and Sapling alongside it first: the contradictions between vendor claims and independent tests show up across this entire category, not just here. The full comparison, including Pangram, lives in Best AI Detectors in 2026.