Yuchang: Academic English

Highlights

Read equations aloud — paste LaTeX or type a formula and hear it in natural spoken English, built for the notation textbooks never teach you to say. Tap to listen, then practice.
Find the words for your talk — turn rough, non-native phrasing, in any language, into polished English for presentations and Q&A.
Fix grammar & word choice — the Syntax Checker rewrites rough sentences into clear, formal academic English and shows exactly what changed.
Look up math terms — a glossary of notation and terms with meanings in your language and how to say them in English.
Phrases to start from — an academic-phrase library for proofs, definitions, and arguments to get your writing moving.

Everything runs on your device — no account, no sign-up, and your text never leaves your iPhone. Works offline, even in airplane mode.
AI features run on Apple Intelligence (iPhone 15 Pro and newer, iOS 26 and later) — no external AI model to download, no network calls. On other devices a built-in rule engine still tidies your draft.
No tracking. No analytics. Data Not Collected. Interface and explanations in English, Korean, Japanese, Simplified Chinese, Traditional Chinese, and Spanish.

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