Purposeful apps
for serious learners.
We build depth-first tools for people who want to genuinely master hard skills — starting with Mandarin Chinese.
Featured App
Menzi
Mandarin Chinese for iOS — serious learning, serious tools.
Hanzi Mode
See a character, type the pinyin. Builds the reading-to-pronunciation link most apps skip.
Pinyin Mode
See pinyin, write a sentence. Forces active production — not just passive recognition.
Word Practice
A new word is drilled in sentences of your own, over three sittings, before the review schedule takes it over.
Speaking Mode
Real-time voice conversation with an AI tutor constrained to your vocabulary — no unfamiliar words.
Listening Mode
Comprehensible input sentences generated from your own deck, read aloud at exactly your level.
Constructs Mode
Grammar pattern library with AI-graded sentence construction exercises, tracked per pattern.
App Preview
See every mode in action
Approach
Why it works
SM-2 spaced repetition
The classic algorithm schedules every card at the exact right interval — reviews compound, never pile up.
AI-personalized practice
Every LLM interaction is shaped by your vocabulary deck and performance data, so feedback is always relevant.
Efficient review sessions
Cards are scored 1–5 with natural language feedback. Spend your time on what you actually need to drill.
Vocabulary-constrained AI
Speaking and Listening modes stay within your known words — comprehensible input at your level, always.
Start learning Mandarin today
Download Menzi on iOS and build a vocabulary that actually sticks.
Download on the App Store