Hey HN, Like a lot of you I’ve been exporting my Grok conversations for a while and ended up with a giant grok-chats.json that just sits there. So I built What Does Grok Know? — a completely client-side, zero-tracking 3D visualization of your entire chat history. Live demo (drag & drop your exported JSON, works in any modern browser): https://grok-brain.vercel.app/ GitHub (MIT open source — Next.js + Three.js, fully forkable): https://github.com/fabianzimber/what-does-grok-know What you see:

Interactive 3D “brain” with topic clusters floating in space Automatic client-side topic clustering + sentiment analysis Timeline scrubber showing conversation evolution Memory highlights, cognitive insights, searchable nodes 100 % private — nothing ever leaves your device

Took me way too many evenings to get the force-directed clustering and camera controls right, but the moment you see your own Grok chats turn into a spinning brain is pretty satisfying. Would genuinely love feedback from the HN crowd:

Does the clustering match how you actually remember your conversations? Any technical suggestions (clustering algorithm, performance, Three.js tricks)? What feature would make this instantly useful for you?

Happy to answer questions or merge PRs. Enjoy exploring your own brain!