Sandbook - Turn EPUBs, PDFs, web articles & scans into natural speech.

Hey Product Hunt! 👋 I'm an indie developer, and I built Sandbook because I wanted a simple way to listen to books, articles, and documents without paying another subscription or sending my reading material to someone else's server. The idea was simple: What if high-quality text-to-speech could run entirely on an iPhone, for free? That's what Sandbook does. It uses Kokoro, an open-weight speech model that runs directly on your device. You can listen to EPUBs, PDFs, web articles, and even scanned pages, with 41 voices across 6 languages. There's also word-by-word highlighting so you can follow along while listening. Curious how the voices sound? You can try Kokoro right in your browser, no app installation needed: https://sandbook.app/kokoro-tts-... And it's completely free. No subscriptions, no accounts, no ads, and no character limits. One limitation worth mentioning: real-time speech pauses when you lock your screen. For background listening, you can prepare a chapter's audio in advance. I'd love to hear your feedback, especially on the voice quality and reading experience. Thanks for checking it out! ❤️