Last updated: 5 June 2026
The full text of every third-party license is bundled inside the app under Settings → Licenses. This page is a plain-language summary of the main credits.
Content sources
HushBook's built-in library surfaces public-domain audiobooks from:
- LibriVox — volunteer-recorded audiobooks released into the public domain. librivox.org
- Internet Archive — public-domain recordings and texts, provided under the Internet Archive's own terms. archive.org
HushBook is not affiliated with either project. Titles, metadata and availability belong to them and can change.
Typefaces
On this website
- Fraunces — Undercase Type. SIL Open Font License 1.1 (via Google Fonts).
- Hanken Grotesk — Hanken Design Co. SIL Open Font License 1.1 (via Google Fonts).
- Ewert — Johan Kallas. SIL Open Font License 1.1 (via Google Fonts).
In the app
- Atkinson Hyperlegible — © Braille Institute of America, Inc., used under its license terms.
- OpenDyslexic — Abelardo Gonzalez. SIL Open Font License 1.1.
- Inter — Rasmus Andersson. SIL Open Font License 1.1.
The SIL Open Font License is available at openfontlicense.org.
On-device speech recognition
Transcription runs entirely on your device via the HushBook Engine, which is built on whisper.cpp — a high-performance C/C++ implementation of OpenAI's Whisper automatic speech-recognition model, created by The ggml authors (originally Georgi Gerganov).
- whisper.cpp — The ggml authors. MIT License. github.com/ggml-org/whisper.cpp
Full license texts for every component bundled in the app ship under Settings → Licenses.
This website
hushbook.app is a static site of hand-written HTML, CSS and JavaScript. Web fonts are served by Google Fonts. The waitlist form stores your email with Supabase — see our Privacy Policy for what that involves. No analytics or tracking scripts are used.
Spotted something we should credit? Email hello@hushbook.app.