# OCAT - AI Language Learning App

> OCAT is an AI-powered language-learning app that turns useful AI conversations into personal sentence libraries for listening, testing, review, and shadowing, with accurate Japanese furigana.

OCAT follows a sentence-first learning loop: ask how to express something, save the useful sentence, then make it familiar through repeated listening and active practice. Learners can study Japanese, Chinese, Cantonese, English, French, German, Spanish, Korean, and Russian.

The default context contains only the concise full documentation. Human-facing pages and individual articles are listed as Optional so agents can retrieve original content selectively without automatically expanding repetitive HTML. Each article link points to its preferred reviewed language; use the sitemap or static blog indexes to discover every available localized version.

## Documentation

- [Full OCAT documentation for AI systems](https://ocat.app/llms-full.txt): Concise product philosophy, features, supported languages, article summaries, and indexing notes

## Optional

- [OCAT official website](https://ocat.app/): Product overview, features, and download entry points
- [OCAT Blog](https://ocat.app/blog/): Static multilingual index of all official learning articles
- [OCAT feature highlights and learning flow](https://ocat.app/blog/ocat-feature-highlights-learning-flow/en): A practical overview of OCAT 9.0 features
- [Accumulate ready-made sentences](https://ocat.app/blog/ready-made-sentences/en): No need to memorize verb forms
- [About Memory](https://ocat.app/blog/about-memory/en): Forgetting is part of memory
- [About Speaking and Listening](https://ocat.app/blog/speaking-and-listening/en): Let's train our ears together
- [About Japanese furigana accuracy](https://ocat.app/blog/japanese-furigana-accuracy/en): OCAT provides a highly professional furigana system
- [Why your Japanese furigana app does not look like a Japanese book](https://ocat.app/blog/furigana-orthographic-vs-morphological/en): Morphological vs orthographic / kanji-unit driven: two routes for Japanese furigana
- [Is shadowing really useful?](https://ocat.app/blog/shadowing-usefulness/en): What matters most for improving foreign-language speaking ability
- [Where is OCAT's Shadow feature, and how do I use it?](https://ocat.app/blog/shadowing-user-guide/en): A practical guide to starting Shadow from Collections, recording your voice, and tracking progress
- [Review system rationale](https://ocat.app/blog/shadowing-review-system-rationale/en): View our detailed algorithm simulation
- [Why OCAT conversation mode leaves room to think](https://ocat.app/blog/conversation-mode-with-room-to-think/en): So “I do not know how to say it” can become a sentence you can use
- [日本旅行实用日语句库：120 句高频表达](https://ocat.app/blog/japan-travel-sentences/zh): 覆盖便利店、交通、餐饮、住宿与观光等高频场景，适合 N4～N3 学习者出发前预习
- [JLPT N1 文法：60 句原创易记例句](https://ocat.app/blog/jlpt-n1-grammar-sentences/zh): 附平假名注音、中文翻译、接续与语感提示；完整句库收录 96 个文法点和 343 条例句
- [商务日语：60 句高频职场表达](https://ocat.app/blog/business-japanese-sentences/zh): 覆盖入职沟通、任务确认与澄清纠错，附人工审校注音、翻译和使用提示；完整句库收录 400 句
- [京都方言：72 句现代京都口语与京言叶](https://ocat.app/blog/kyoto-dialect-sentences/zh): 涵盖「や、ねん、へん、～はる」、京都街道方向与传统京言叶，附人工审校注音、标准日文、使用层级及《京ことばの辞典―どうどす》等研究书目
- [自然日语口语：60 句真实会话表达](https://ocat.app/blog/natural-japanese-conversation-sentences/zh): 覆盖相槌、接话、追问与自然回应，附人工审校注音、翻译和语气提示；完整句库收录 400 句
- [日本生活日语：60 句真实场景表达](https://ocat.app/blog/living-in-japan-japanese-sentences/zh): 覆盖租房、行政、银行、医疗、交通与工作等长期生活场景；完整句库收录 400 句
- [JLPT N5 文法：60 句核心例句](https://ocat.app/blog/jlpt-n5-grammar-sentences/zh): 从名词句、助词到动词变形，附人工审校注音、翻译和知识点；完整句库收录 200 句
- [JLPT N4 文法：60 句核心例句](https://ocat.app/blog/jlpt-n4-grammar-sentences/zh): 覆盖普通形、引用、条件、授受、可能与推测等表达；完整句库收录 300 句
- [日语口语缩约与听力：60 句真实会话表达](https://ocat.app/blog/spoken-japanese-contractions-listening/zh): 训练「てる」「ちゃう」「なきゃ」等高频缩约，附完整形式和语气说明；完整句库收录 300 句
- [From Daily Shadowing to Speaking Naturally 30 Days Later: How We Know When Practice Is “Enough”](https://ocat.app/blog/shadowing-consolidation-progress/en): Weighted progress from daily shadowing to natural recall 30 days later
- [OCAT Privacy Policy](https://ocat.app/privacy): How OCAT handles user data
- [OCAT Terms of Use](https://ocat.app/terms): Terms governing use of the OCAT application