Jiejing Zhang

Building on-device AI for the Mac

About

I'm the developer behind ThinkSpread. We build Tempo9, our own production-grade inference engine for Apple silicon and NVIDIA GPUs, and Mac apps that run entirely on it. Our first app, Voice Rack, turns a folder of recordings into a library you can ask, fully offline. Mac developers can use the same engine through our Swift SDK on GitHub.

Links

Voice Rack (Mac App Store)

Tempo9 Swift SDK (GitHub)

ThinkSpread

Badges

Tastemaker

Gone streaking

Maker History

Voice RackOffline AI transcription for voice recorders and memos
Oct 2026

🎉

Joined Product HuntOctober 20th, 2026

Forums

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4h ago

Voice Rack - Offline AI transcription for voice recorders and memos

Offline AI transcription for voice recorders and phone memos. Point Voice Rack at your recordings and every file gets a transcript, a summary and tags. Ask one recording, a folder or tag, or your whole library; every answer cites the second it came from, and one click plays it. Speaker names, 90+ languages, a term book that learns, seven export formats. Everything runs on your Mac: no network permission, nothing uploaded. Free per recording; Pro is a one-time purchase with a 14-day free trial.