iLang Detect and Copyleaks both check for AI writing, but they serve different needs. Copyleaks is a full platform: AI detection, plagiarism checks, image analysis, and API access for 30+ languages. It's freemium, with paid plans starting at $13.99/month. iLang is completely free with no signup, and it doesn't just give a score. It shows you every sentence-level problem across six dimensions like vocabulary, structure, and tone, plus a fix suggestion for each issue. So which one should you use?
Side by side
scroll sideways on small screens →| Feature | iLang Detect | Copyleaks |
|---|---|---|
| Pricing | Free | Freemium; Personal from $13.99/mo billed annually ($167.88/yr) or $16.99 monthly; 1 credit = 250 words |
| Free tier | Free to use, no signup | Free web AI Detector at copyleaks.com/ai-detector (site markets it as a "free AI text checker"); the pricing page itself lists no permanent free credit plan, full platform is paid |
| Output style | Sentence-level issue list across 6 dimensions (vocabulary, structure, tone, punctuation, logic, rhythm) plus an AI probability score | AI probability with plagiarism in one report (AI Logic) |
| Languages | English (Chinese version at detect.ilang.cn) | AI detection in 30+ languages; plagiarism detection in 100+ languages (official pricing page) |
| Fix suggestions | Yes: every flagged fragment gets a problem explanation and a fix suggestion, plus overall rewrite advice | Not advertised; detection only |
| API | Not public yet | Yes |
| Best for | Writers and editors who want to fix the text, not just get a score | Education institutions (LMS integrations) and enterprises; Personal/Pro plans for students, writers, professionals and small teams |
| Vendor accuracy claim | No accuracy percentage claimed. iLang shows the markers themselves, so you can judge every flag instead of trusting a number. | "99% accuracy backed by independent third-party studies" and "find AI-written content with over 99% accuracy, even when it's carefully blended with human writing" , copyleaks.com (elsewhere the company has published a 99.1% figure with 0.2% false positive rate, per copyleaks.com/ai-content-detector/testing-methodology) |
Where they differ
Pricing and signup
iLang is free to use with no signup required. No credits, no limits, no account. Copyleaks offers a free web AI detector, but its full platform is paid. Personal plans start at $13.99/month billed annually or $16.99 monthly, with credits that don't roll over. Pro and Enterprise plans cost more. For anyone on a budget, iLang's zero cost is a clear advantage.
Depth of analysis
iLang breaks down each sentence into six specific issues: vocabulary, structure, tone, punctuation, logic, and rhythm. Every flagged fragment gets an explanation and a fix suggestion. Copyleaks gives you an AI probability score and a plagiarism report, but it doesn't tell you how to improve the text. If you want to actually edit your writing, iLang's detail is more useful.
API and integrations
Copyleaks has a developer API for AI and plagiarism detection, plus browser extensions, a Google Docs add on, and LMS integrations. It's built for schools and businesses that need to scan lots of content at scale. iLang doesn't have a public API yet, so it's not suitable for automated workflows. For individual writers, though, that's rarely a problem.
Which one to pick
Choose Copyleaks if you need plagiarism detection or API access.
Copyleaks covers AI detection, plagiarism, and image analysis across 30+ languages. It has a developer API, browser extensions, and LMS integrations. If you run a school or enterprise and need to scan large volumes of content, Copyleaks is the better pick.
Choose iLang if you want to fix AI text for free with no signup.
iLang shows every sentence level issue and gives you a fix suggestion for each one. It's completely free with no account or credit limits. Writers and editors who want to improve their text quickly will find it invaluable.
Use both if you want detection from Copyleaks and editing from iLang.
Run your text through Copyleaks to get an AI probability and plagiarism check. Then take any flagged content to iLang for detailed fixes. This way you get the detection power of Copyleaks and the editing help of iLang.
Frequently asked questions
Yes, iLang is completely free to use with no signup and no rate limit. You can run as many checks as you want. There are no paid plans or hidden credits.
Copyleaks claims 99% accuracy based on its own testing. Independent benchmarks in 2026 found real world accuracy between 77% and 96%, with false positive rates near 5% on some content types.
Yes, Copyleaks includes plagiarism detection in its AI reports. It supports 100+ languages for plagiarism and offers cross language translation detection on Pro plans.
iLang analyzes text for six sentence level issues common in AI writing. It doesn't claim to detect specific models. Instead, it helps you fix the patterns that make text sound artificial.
See the issues, not just the score
Paste the same draft you ran through Copyleaks. Free, no signup, nothing stored.