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Andrej Karpathy used Claude Opus 5.5 to build HackerTube (hackertube.org), a YouTube-style site featuring 6,454 videos recommended across 40K Hacker News comments from 2007-2026, developed end-to-end in about two hours.
Invidious is an open-source alternative front-end to YouTube that is lightweight, ad-free, and requires no JavaScript, with features like subscriptions, audio-only mode, and a developer API.