Show HN: Muscle Memory – Can you still write code without AI?

A developer with six years of experience built Muscle Memory, a LeetCode-style practice site with more realistic challenges across 12 languages, where code runs in a network-denied sandbox in the browser with no account required. With user consent, it records practice as raw events including keystrokes, runs and submissions, aiming to build an open dataset on how people write code in the AI era, with individual results kept private unless shared and a "Stealth" mode excluding data from published findings. The code is MIT-licensed on GitHub, and the data is planned to be published as a report/notebook on the site and released raw under MIT license (parquet) once a critical mass is reached.