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Language Hub — AI-Powered Language Analysis Tools

Analyze text difficulty, check CEFR levels, adapt content, generate readings, and more. Free tools for teachers and language learners.

🔬 CEFR Analysis⚡ Instant Results🎓 Research-Validated

Validated by Columbia University

Cathoven's CEFR tools are recognized as top-tier in text difficulty analysis in peer-reviewed research.

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No credit card required • Instant access to all tools

Choose Your Language Tool

Nine AI-powered tools to analyze, adapt, and improve language — all in one place.

Most Popular

CEFR Checker

Instantly analyze any English text and highlight each word by CEFR level (A1–C2). Perfect for teachers and self-study.

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Level Adaptor

Rewrite any text to a target CEFR level automatically. Simplify complex articles for beginners or enrich basic texts for advanced learners.

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Catile Checker

Measure text readability with our proprietary Catile score. Get a precise difficulty rating validated by Columbia University research.

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Comprehension Questions

Paste any passage and instantly generate a full set of comprehension questions at the right difficulty level for your students.

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Reading Generator

Create custom reading passages on any topic at a chosen CEFR level — ideal for lesson planning and differentiated instruction.

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Video Analyzer

Analyze YouTube videos for language level and vocabulary. Extract transcripts and get a CEFR difficulty rating for any video.

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Writing Reviser

Get detailed writing feedback and revision suggestions. Improve clarity, coherence, and vocabulary in any English text.

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Readability Checker

Check Flesch-Kincaid, Gunning Fog, and other readability scores. Instantly see how easy or hard your text is to read.

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Chinese Text Analyzer

Analyze Chinese text by HSK level. Identify vocabulary difficulty and get a comprehensive breakdown of character and word levels.

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Why Cathoven Language Tools?

Built on a decade of language research and trusted by 1.2M+ learners and educators worldwide.

CEFR-Aligned Analysis

All tools are built around the Common European Framework of Reference, the global standard for language proficiency.

Validated by Research

Cathoven's language analysis is validated by Columbia University and cited in 50+ scientific articles.

Instant Results

Paste any text and get your analysis in seconds — no waiting, no sign-up required for basic tools.

For Teachers & Learners

Whether you're preparing lessons, self-studying, or researching language, these tools work for everyone.

Frequently Asked Questions

What does "Cathoven" mean?
Cathoven combines "Cat" and "Beethoven." The vision is to enable language teachers to generate personalized teaching materials with the same precision and innovation as master Beethoven.
Is my text kept private and confidential?
Yes. All texts you input are secured and not accessible by any other user, company, or institution. Texts are stored temporarily for processing and can be deleted manually via your History page. See our privacy policy for full details.
Do you offer APIs for developers?
Yes. All Cathoven Language Hub tools are available as APIs. You can start testing at /cathoven-ai-tools-apis for documentation and integration guides.
Do you plan to support other languages besides English?
Yes. Spanish CEFR support is coming soon, and French is also on the agenda. Chinese (HSK) analysis is already available. Follow us on LinkedIn for updates.
How do I cite Cathoven in a research paper?
APA format: Cathoven A.I. (2026). CEFR Checker (Version 2.0) [Web app]. Cathoven Language Hub, nexthub.cathoven.com. MLA format: CEFR Checker. Cathoven A.I., Vers. 2.0, 2026. Cathoven Language Hub, nexthub.cathoven.com.
What is the CEFR level of a text?
The CEFR (Common European Framework of Reference) classifies language proficiency into six levels: A1, A2, B1, B2, C1, and C2. Cathoven CEFR Checker analyzes vocabulary, grammar, and sentence complexity to assign a CEFR level to any English text instantly.
How does the Level Adaptor work?
Paste any English text and choose a target CEFR level. The Level Adaptor rewrites the text by replacing vocabulary, paraphrasing concepts, and restructuring sentences to match the target difficulty while preserving the original meaning.
Are Cathoven language tools free for teachers?
Most Cathoven Language Hub tools offer free usage tiers. The CEFR Checker, Readability Checker, and Video Analyzer all provide free analyses. Teachers can create a free account for additional daily usage on tools like the Reading Generator and Level Adaptor.
Is the CEFR Checker validated by research?
Yes. Cathoven CEFR tools are validated by Columbia University research as top-tier in text difficulty analysis. The tools are cited in over 50 peer-reviewed scientific articles on language assessment and education.

Start Analyzing Language Today

Free to use. No sign-up required for most tools. Trusted by teachers and learners in 150+ countries.

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