Obook

Obook is a text-to-speech app that converts PDFs, EPUBs, and other written content into audiobooks using realistic AI voices. It supports multi-language narration, imports of PDFs and EPUBs with cleanup of formatting noise, word-by-word highlighting for follow-along reading, chapter navigation, reading streaks, notes, and access to a public domain book library. The app syncs across devices and functions offline. Developed solo, it uses a self-hosted GPU backend for cost-effective high-quality voice synthesis.