Currently in beta
Your books.
Anywhere.
Codex Cloud syncs reading and listening across devices while keeping your library portable. Upload your ebooks and audiobooks, align them automatically, and enjoy synchronized readalouds on any device.
How it works
Three steps from your existing library to synchronized reading and listening.
Upload
Add your ebooks and audiobooks — formats you already own, from sources you already use.
Align
Codex automatically synchronizes your audiobook narration with the ebook text, creating a readaloud.
Read & Listen
Text highlights as narration plays. Switch between reading and listening seamlessly, on any device.
Why you can trust it
Codex Cloud is built for readers who care about ownership, privacy, and transparency.
Your books stay yours
No lock-in, ever. Export your full library at any time. Your files, your annotations, your data — always portable.
Privacy first
Your reading habits are not tracked, sold, or profiled. Codex Cloud exists to serve your library, not to monetize your attention.
Built on open source
Codex Reader is built on the Storyteller platform — an open-source project you can inspect, self-host, and contribute to.
Simple pricing
Codex Cloud is currently in beta. During the testing period, all features are free for TestFlight users.
Beta
Free
All features included during the testing period
- ✓Unlimited uploads and alignments
- ✓Cloud sync across all devices
- ✓Full library export at any time
Post-launch, Codex Cloud will be available as an affordable subscription.