iLang Detect and QuillBot AI Detector both spot AI-generated text, but they go about it very differently. iLang is completely free with no signup, and it gives you a sentence-level breakdown across six dimensions along with an AI probability score. QuillBot offers detection in over 20 languages, but its free tier limits you to around 1,200 words per scan and a capped number of daily checks.
So which one actually helps you improve your writing? iLang shows you exactly which sentences look off and why, plus how to fix them. QuillBot gives you a single score and leaves the rest to you. It's a trade-off between actionable feedback and broad language support.
Side by side
scroll sideways on small screens →| Feature | iLang Detect | QuillBot AI Detector |
|---|---|---|
| Pricing | Free | Freemium; Premium from $8.33/mo billed annually ($99.95/yr) or $19.95 monthly |
| Free tier | Free to use, no signup | Free tier: up to ~1,200 words per scan with a capped number of scans per day (per Aug-2026 third-party pricing reviews; quillbot.com blocks scraping) |
| Output style | Sentence-level issue list across 6 dimensions (vocabulary, structure, tone, punctuation, logic, rhythm) plus an AI probability score | AI percentage score |
| Languages | English (Chinese version at detect.ilang.cn) | 20+ languages (stated on quillbot.com) |
| Fix suggestions | Yes: every flagged fragment gets a problem explanation and a fix suggestion, plus overall rewrite advice | No inline fixes; Premium bundles a separate paraphraser and humanizer |
| API | Not public yet | No |
| Best for | Writers and editors who want to fix the text, not just get a score | Students, general writers and consumers already in the QuillBot ecosystem |
| Vendor accuracy claim | No accuracy percentage claimed. iLang shows the markers themselves, so you can judge every flag instead of trusting a number. | None stated (no percentage published; official FAQ says no AI detector can provide 100% accuracy, quillbot.com) |
Where they differ
Output detail: score vs. problems
QuillBot returns a single AI percentage score. You get a number, but no explanation of which parts triggered the detection or what to do about them. iLang, in contrast, lists every flagged sentence and breaks it down across vocabulary, structure, tone, punctuation, logic, and rhythm. Each fragment gets a plain explanation of the issue and a suggested rewrite. That difference matters when you actually want to edit your work.
Pricing and access limits
iLang is free forever with no signup and no rate limit. You can scan as much text as you want, whenever you want. QuillBot's free tier caps scans at about 1,200 words per check and limits how many checks you can run per day, according to third-party pricing reviews. To remove those limits, you need QuillBot Premium at $8.33 per month billed annually. That subscription also unlocks the paraphraser, humanizer, and other tools, but the detector itself is behind a paywall for heavy use.
Language support depth vs. breadth
QuillBot supports over 20 languages, making it a solid choice for non-English writers. iLang currently only works with English, though there is a Chinese version at detect.ilang.cn. That narrower focus lets iLang dig deeper into English sentence structure and offer more precise feedback. If you write in multiple languages, QuillBot's breadth is a clear advantage. If you write primarily in English and want thorough analysis, iLang's depth wins.
Which one to pick
Choose QuillBot if you write in multiple languages or need an all-in-one writing suite.
QuillBot covers 20+ languages and bundles its detector with a paraphraser, humanizer, and plagiarism checker. If you're already paying for Premium, the detector is a handy extra. The free tier works for occasional checks, though the daily limits can be restrictive.
Pick iLang if you want to understand and fix your writing, not just get a score.
iLang shows you exactly which sentences are problematic and why, across six dimensions, and gives you rewrite suggestions. It's free with no signup and no limits. Perfect for editors, students, and anyone who wants to improve their text.
Use both if you want to cross-check results and get both broad coverage and deep feedback.
Run your text through QuillBot for a quick score in multiple languages, then use iLang to drill into the specific sentences that need work. No tool is 100% accurate, so comparing outputs can give you more confidence in your edits.
Frequently asked questions
Yes, iLang is completely free with no signup required and no rate limit. You can scan as much text as you want. QuillBot's free tier, on the other hand, caps scans at around 1,200 words per check and limits how many checks you can run per day, according to third-party pricing reviews.
Yes. iLang lists every flagged sentence and breaks it down across six dimensions: vocabulary, structure, tone, punctuation, logic, and rhythm. Each issue comes with a plain explanation and a suggested rewrite, plus overall advice for improving the text. QuillBot only gives a percentage score with no inline fixes.
QuillBot does not publish a specific accuracy percentage. Its official FAQ says no AI detector can provide 100% accuracy. Third-party reviewers have noted inconsistent results on paraphrased text, and QuillBot's help center acknowledges that even human-written content can be flagged as AI. iLang also doesn't claim a specific accuracy rate.
Currently, iLang only supports English, with a separate Chinese version at detect.ilang.cn. QuillBot supports over 20 languages. If you need detection in a language other than English or Chinese, QuillBot is the better option. For English writing, iLang offers more detailed feedback.
See the issues, not just the score
Paste the same draft you ran through QuillBot. Free, no signup, nothing stored.