I wanted a simple way to listen to articles on the go and found elevenreader. While I think the voices they have are great, I didn't want to bother with an account, a subscription, and yet another service interested in my content habits.

I thought that TTS models and runtimes surely must have reached a point where they can run effectively on a mobile device with WebGPU. Maybe a fully local webapp could be feasible?

Shortly after, I heard about Phonon here on HN and was motivated to spend a weekend with Claude and see what we could come up with :)

The result is:

- A fully local Audiobook/TTS webapp - An optimised Phonon runtime reaching ~4x increase in speed on WebGPU and CPU compared to stock Phonon - Streaming, so the audio starts quickly and continues to generate uninterrupted while the phone is locked - Library with an optional "auto-download" feature, so you can pre-render articles to be listened to later - Fully serverless and local, the bundle is hosted in Cloudflare workers, no backend, no database, no user accounts, no tracking. Only piece of backend logic is a simple proxy to use as fallback for fetching URLs that the browser is unable to fetch b/c of CORS

Depending on your OS version, you may need to enable WebGPU in iOS/Safari settings, Chromium-based browsers in chrome://flags (search for WebGPU and enable both settings), and allow JIT in Site Controls on Vanadium (GrapheneOS).