Cathoven Enterprise APIs
Integrate IELTS scoring, CEFR analysis, question generation, text adaptation, and more into your language learning platform. 11 APIs available as REST endpoints.
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IELTS Tools
AI-powered IELTS assessment APIs with examiner-level accuracy.
IELTS Essay Checker
AI-powered IELTS essay scoring using official band descriptors. Get band scores for Task Achievement, Coherence, Lexical Resource, and Grammar for both Task 1 and Task 2.
IELTS Rewriter
Improve IELTS essays with targeted vocabulary upgrades, grammar corrections, and coherence enhancements while preserving the writer's original argument structure.
Writing Checker
General-purpose writing analysis with grammar, spelling, and style feedback. Sentence-by-sentence suggestions with "i+1" level improvements.
Language Analysis
Analyze text difficulty across CEFR, Catile, readability, and HSK frameworks.
CEFR Text Analyzer
Analyze text difficulty with 10 sub-levels per CEFR level. The only tool that analyzes sentence structure and verb tenses in detail. With the largest CEFR word database in the world.
Catile Text Analyzer
Measure reading difficulty for native English speakers using Cathoven's proprietary Catile percentile score. Validated by Columbia University research.
Readability Analyzer
Calculate Flesch-Kincaid, Gunning Fog, SMOG, and 5 more readability formulas with a unique Consensus Score. Free to use via API.
HSK Chinese Analyzer
Analyze Chinese text difficulty by HSK level. Word-by-word HSK level detection with character and vocabulary breakdowns.
Content Generation
Generate and transform educational content with AI.
Exercise Creator
Generate reading comprehension questions from any passage. Diversified question sets including wh-questions and answers, calibrated to the text's difficulty.
Level Adaptor
Rewrite text to any target CEFR level while preserving the original meaning. Accurate CEFR-level targeting that ChatGPT can't match.
Reading Generator
Generate custom reading passages aligned with targeted vocabulary, grammar, themes, genres, and proficiency levels.
Writing Reviser
Sentence-by-sentence writing feedback. Refines spelling and grammar with "i+1" level suggestions. Preserves the writer's voice.
Why Cathoven APIs?
Purpose-built for language education — not a generic LLM wrapper.
Research-Grade Accuracy
Validated by Columbia University, cited in 50+ papers.
10 CEFR Sub-Levels
More precise than standard A1-C2 (e.g., A1.7 instead of just A1).
What ChatGPT Can't Do
Purpose-built NLP models trained specifically for language education.
Easy Integration
RESTful APIs with clear documentation and free trial credits.
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Three steps to your first API call.
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Start making API calls with 50 free credits.
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