iLang Detect and Grammarly AI Detector both claim to spot AI-written text, but they take very different approaches. iLang is completely free, no signup required, and gives you a sentence-level breakdown across six dimensions like vocabulary and tone. Every flagged fragment comes with a problem explanation and a fix suggestion. Grammarly's AI Detector offers a percentage score with flagged sentences, but the full feature set including Authorship and plagiarism lives in the Pro plan, which starts at $12 a month. It's part of a bigger suite, not a standalone tool. Which one actually helps you fix your writing, not just point out a problem?
Side by side
scroll sideways on small screens →| Feature | iLang Detect | Grammarly AI Detector |
|---|---|---|
| Pricing | Free | Freemium; Pro from $12/mo billed yearly ($144/yr; $30 monthly) |
| Free tier | Free to use, no signup | Free web AI checker (paste or upload for an AI percentage); the Free plan includes 100 AI prompts a month. The full AI Detector agent, Authorship and plagiarism live in Pro. |
| Output style | Sentence-level issue list across 6 dimensions (vocabulary, structure, tone, punctuation, logic, rhythm) plus an AI probability score | AI percentage score with flagged sentences and explanations |
| Languages | English (Chinese version at detect.ilang.cn) | None stated on the detector page; targets ChatGPT, Gemini, Claude and Copilot output, mostly English. |
| Fix suggestions | Yes: every flagged fragment gets a problem explanation and a fix suggestion, plus overall rewrite advice | One-click handoff to AI Rewriter in the same suite; no per-flag fix explanations |
| API | Not public yet | No (no public AI-detection API; Grammarly's developer product is a writing SDK) |
| Best for | Writers and editors who want to fix the text, not just get a score | Students self-checking before submission, educators and workplace writers; positioned as a pre-submission check, not enforcement |
| Vendor accuracy claim | No accuracy percentage claimed. iLang shows the markers themselves, so you can judge every flag instead of trusting a number. | Vendor claims "99% detection accuracy" and #1 on the RAID benchmark (99.91%); the same page's FAQ says "No AI detector is 100% accurate." |
Where they differ
Pricing and access
iLang is free to use with no signup and no rate limit. You just paste text and get results. Grammarly's AI Detector is freemium: the free web checker gives you an AI percentage, but the Pro plan at $12 a month (billed yearly) unlocks the full AI Detector agent, Authorship, and plagiarism tools. There's also a 100 AI prompts per month limit on the free plan. If you don't want to pay or create an account, iLang wins.
Detail of the output
iLang gives you a sentence-level issue list across six dimensions: vocabulary, structure, tone, punctuation, logic, and rhythm. Each flagged fragment gets a problem explanation and a fix suggestion, plus overall rewrite advice. Grammarly shows an AI percentage score with flagged sentences and explanations, but it doesn't offer per-issue fix suggestions. Instead, you get a one-click handoff to the AI Rewriter within the suite. That's a different kind of help.
Standalone vs. suite integration
iLang is a focused AI detector tool. You go to the site, paste your text, and get a detailed analysis. Grammarly's AI Detector is embedded in the broader Grammarly suite, which includes a browser extension, desktop app, and writing assistant. That makes it convenient if you already use Grammarly for grammar checks. But if you just want to check a piece of text without the extra baggage, iLang's simplicity is a strength.
Which one to pick
Pick Grammarly if you want a full writing suite with AI detection built in.
Grammarly's AI Detector is part of a larger ecosystem. You get grammar checking, tone suggestions, plagiarism detection, and Authorship tools all in one place. If you're already paying for Grammarly Pro, the detector is a nice bonus. It's also good for educators and students who need a pre-submission check and want the extra features.
Pick iLang if you want free, detailed fix suggestions without signing up.
iLang is perfect for writers and editors who need more than a score. It tells you exactly what's wrong with each sentence and how to fix it, across six dimensions. No account, no payment, no rate limits. If you're serious about improving your writing and want full control, iLang is the clear choice.
Use both if you want a second opinion and a broader set of features.
Run a text through iLang to get detailed fix suggestions, then check it with Grammarly's AI Detector to see if it flags anything else. Grammarly's suite can also handle grammar and plagiarism checks. Combining both gives you a more complete picture, especially for important submissions.
Frequently asked questions
Yes, iLang is completely free to use. You don't need to sign up, and there's no rate limit on how many times you can check text. Grammarly's free AI checker has a limit of 100 AI prompts per month, and the full detector requires a Pro subscription.
Grammarly claims 99% detection accuracy and the top spot on the RAID benchmark, but independent tests have shown mixed results. A Pangram Labs test missed all 9 AI samples, and multiple 2026 reviews call it conservative on paraphrased AI text. iLang doesn't make a specific accuracy claim, but its detailed sentence-level analysis helps you see why a flag was raised.
Yes, that's one of iLang's main strengths. Every flagged fragment comes with a problem explanation and a fix suggestion. You also get overall rewrite advice. Grammarly's AI Detector flags sentences but doesn't give per-issue fixes; instead, it offers a one-click AI Rewriter in the same suite.
Grammarly offers a free web AI checker that gives you an AI percentage score and flagged sentences. But the full AI Detector agent, Authorship, and plagiarism tools are only available in the Pro plan, which costs $12 a month billed yearly. iLang gives you a complete analysis for free, no subscription needed.
See the issues, not just the score
Paste the same draft you ran through Grammarly. Free, no signup, nothing stored.