Prototypes
App Lab
Small app prototypes and interactive demos.
Ideas that started as sketches and turned into working things.
Digit Reader
手写数字识别
Draw a digit on the canvas and watch a neural network recognize it in real time. A classic ML demo, interactive and instant.
Try it
PY/FDE Lab
Python 面试练习台
A self-contained Python practice bench — lessons, drills and staged mock interviews, all running on Pyodide in the browser. No server, no AI.
Try it
interview-prep
PIN required
Private interview preparation briefings, readable on a phone. PIN-locked; the pages themselves are encrypted at rest.
Try it
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