IA Checker vs Copyleaks: Which AI Detector Should You Use in 2026?

Positioning

Copyleaks is an enterprise-leaning integrity vendor. Its AI detector page markets multilingual models, LMS connectors, a browser extension, a Google Docs add-on and white-labeled API access. That distribution surface is a genuine advantage for institutions already buying software the LMS way.

IA Checker is a European workspace for people who act on the score: rewrite, review sources, translate, label under the EU AI Act. Free checks are close on character limits (20,000 here, 25,000 on its detector page). The gap that matters is what each product is built to do next.

Copyleaks publishes third-party accuracy messaging and a .03% false positive rate on its site. Those are its claims. We do not restate them as independent facts, and we do not claim a general accuracy win against them.

Scorecard

Counted from the 22 rows in the table below, not asserted separately.

1. 11IA Checker ahead
2. 4Tied
3. 7Copyleaks ahead

Feature comparison

Feature	IA Checker	Copyleaks	Ahead
Accuracy
Detection engines	Multiple engines (Advanced and Ultra), with Pangram integration in progress	A single Copyleaks AI detector, with AI Logic explainability on paid access (copyleaks.com)	IA Checker
Sentence-level and explainability	Per-sentence signals with the passages that drove the score, limits shown next to the result	Its site describes AI Logic, AI Phrases and AI Source Match for why text was flagged (copyleaks.com)	Tied
How a result is framed	An indicator, with limits and appeal guidance published alongside the score	Its site leads with accuracy percentages and independent-study messaging (copyleaks.com)	IA Checker
Multilingual detection	Calibrated primarily for the languages the product documents on-site	Its site states support for over 30 languages with published per-language test figures (copyleaks.com)	Copyleaks
Third-party study citations	Methodology documented on the site; no peer-reviewed publications listed	Its site cites independent studies, including Cornell Tech research, in its messaging (copyleaks.com)	Copyleaks
Coverage
Text detection	Yes	Yes	Tied
Image and video detection	Dedicated image and video detection routes	Its AI detector page focuses on text, documents and AI-generated source code (copyleaks.com)	IA Checker
Writing tools after detection	Humanizer, paraphraser, translator and grammar in the same workspace	Detection and plagiarism are the focus; rewriting is not the marketed next step (copyleaks.com)	IA Checker
AI-generated source code detection	Not part of the published product	AI-generated source code detection is marketed on its AI detector page (copyleaks.com)	Copyleaks
Plagiarism checker	Plagiarism review is part of the paid workspace	An award-winning plagiarism checker is marketed alongside the AI detector (copyleaks.com)	Tied
Pricing
Free tier	Free checks up to 20,000 characters, no account required to try	Its site states scans up to 25,000 characters without logging in, plus limited free credits for new accounts (copyleaks.com)	Tied
Entry paid plan	€4.90 per month for 100,000 words, 25,000 characters per check	Personal and Pro plans are described on its AI detector FAQ; enterprise pricing is quote-based (copyleaks.com)	IA Checker
What the subscription covers	Detection plus humanizer, plagiarism, translation and grammar in one plan	Priced as an integrity suite: AI detection, plagiarism, AI Logic and enterprise connectors (copyleaks.com)	IA Checker
Privacy
Retention of submitted text	Kept only for the duration of the requested operation unless you save it	Its privacy policy describes retention as needed for services, disputes and legal obligations, with Shared Data Hub opt-out controls (copyleaks.com)	IA Checker
Training on submissions	Not used for model training without express opt-in	Its privacy policy states scan content may be used to train models, with an opt-out via customer support (copyleaks.com)	IA Checker
Hosting region	European Union	Its privacy policy states personal information may be transferred and stored in the United States and other regions (copyleaks.com)	IA Checker
Security certifications	EU-hosted product with GDPR-first posture	Its site lists GDPR compliance plus SOC 2 and SOC 3 certification (copyleaks.com)	Copyleaks
Workflow
LMS integrations	None published	Its site lists Canvas, D2L, Moodle, Blackboard, Schoology, Edsby and Sakai (copyleaks.com)	Copyleaks
Browser extension and Google Docs	None	Chrome and Edge extension plus a Google Docs add-on are advertised (copyleaks.com)	Copyleaks
Public API	No public API	Enterprise AI detection via API is marketed, including white-labeled options (copyleaks.com)	Copyleaks
Compliance
EU AI Act labelling	Built-in labelling tool with the official Article 50 disclosure icons	Not part of the published AI detector suite	IA Checker
GDPR posture	EU-established, GDPR-first	GDPR compliance is stated on its site and detailed in its privacy policy (copyleaks.com)	IA Checker

Enterprise distribution versus a writing workspace

Copyleaks wins on connectors. LMS plugins, a browser extension, Google Docs, and an enterprise API are how institutions buy detection without asking every teacher to open a new tab. If that is the procurement shape, those rows decide the page.

IA Checker wins on what happens after the score for an individual or a small European team: rewriting, plagiarism review, translation and EU AI Act labelling in one place, with a public entry price instead of a quote-led enterprise ladder.

These are adjacent products with different buyers. An LMS admin and a solo writer who needs a disclosure label are not choosing between twins.

Free checks are close; languages are not

On free access the gap is small. Copyleaks' AI detector page states 25,000 characters without login; we offer 20,000. That is not the row that should decide a serious comparison.

Where Copyleaks is clearly ahead is multilingual breadth: its site states support for over 30 languages with published per-language figures. If that is your corpus, trial it.

Our bet is different: more than one engine, tighter EU retention defaults, and the writing tools you open after the score. Choose on that axis, not on a 5,000-character free-cap delta.

Training defaults and where text lives

Copyleaks' privacy policy states that scan content may be used to train models, with an opt-out through customer support, and that personal information may be stored in the United States and other regions. It also markets SOC 2 and SOC 3 certification, which many enterprise buyers require.

We keep submitted content only for the operation unless you save it, do not train on it without express opt-in, and process in the European Union. That is a different default, not a claim that Copyleaks is careless.

Enterprise buyers often trade retention flexibility for certifications and LMS fit. Individuals and EU teams often trade the opposite direction. Decide which trade you are actually making.

IA Checker vs Copyleaks FAQ

Is Copyleaks accurate?

Copyleaks publishes accuracy and false-positive figures on its AI detector page and cites third-party studies. No detector can honestly claim universal accuracy. On iachecker.com the advantage we claim is architectural rather than a louder percentage: more than one engine, disagreement made visible, and the limits shown beside the result. Run the same human-written and model-written samples through both before you standardise on either.

How generous is Copyleaks' free AI detector?

Its AI detector page states you can scan up to 25,000 characters without logging in, and that new users receive limited free credits. IA Checker offers free checks up to 20,000 characters. The free caps are close; decide on engines, privacy defaults and what you do after the score.

Does Copyleaks integrate with LMS platforms?

Yes. Its site lists Canvas, D2L, Moodle, Blackboard, Schoology, Edsby and Sakai. IA Checker does not publish LMS integrations today. If detection has to live inside the LMS, that is a real reason to choose Copyleaks.

Does Copyleaks train on submitted content?

Its privacy policy states that scan content may be used to train models and improve services, and that direct customers may opt out by contacting support. Read the policy for Shared Data Hub controls and enterprise processor terms rather than relying on a short summary.

IA Checker vs Copyleaks: which should I choose?

Choose Copyleaks for multilingual enterprise integrity with LMS, extensions and API distribution. Choose IA Checker for multi-engine detection, a writing workspace after the score, public entry pricing, EU hosting, short retention and EU AI Act labelling. Both offer substantial free checks, so test them on your own material.

Read next

• How AI humanizers work
• EU AI labels: the 3 official icons
• Try the AI detector
• All comparisons