Vibe coded an on-device audiobook player for iOS using Supertonic 3 — 10 voices, 31 languages, 100% offline
Vibe coded this over a weekend. Drop any DRM-free EPUB in, tap play. No cloud, no API keys, no subscription.
Uses Supertonic 3 by Supertone — ~99M param multilingual TTS running entirely on-device. 10 custom-trained studio voices, 31 languages, background playback, paragraph-level resume.
MIT licensed. Just Xcode + a free dev profile to build.
🌐 https://books.josepht.in | 💻 https://github.com/joseph6377/J7seven
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