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Scheduled launch — Aug 28, 2026

Cobalt is listed on AI Kaptan and will enter the daily launch competition on that day. Community upvotes open on launch day.

Cobalt
eBook Reader
Free

Cobalt

Cobalt is an open-source application platform and Rust SDK for Kobo e-readers featuring a launcher, on-device App Store, and capability-isolated runtime.

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Rating
0
Reviews
0
Upvotes
about 3 hours ago
Listed
eBook Reader
Productivity
GitHub
Rust SDK
Open Source
Kobo
E-Ink Apps
App Store
Tool information
Provider
BandarLabs
Platforms
Kobo OS
Linux
Web Browser (Simulator)
Languages
English
API Available
Yes
Added to directory
about 3 hours ago
Last updated
about 3 hours ago
Rating
Not available
Pricing
Free

About Cobalt

What the tool does and who it's for

Cobalt is an open-source application platform and developer framework for Kobo e-readers. It equips Kobo devices with a dedicated launcher, an on-device signed App Store, a Rust SDK, and a capability-isolated runtime that isolates apps in unprivileged processes. After a single initial installation over USB, users can install, update, and remove applications directly on the e-reader over Wi-Fi without replacing Kobo's stock boot chain or stock reader functionality. It includes built-in applications such as Hacker News, Gutenbird OPDS reader, arXiv preprint viewer, Daily Brief, AI Command Center, Terminal, and games like Sudoku and Tic-tac-toe.

Key capabilities

On-device signed App Store that installs, updates, and removes applications over Wi-Fi
Rust SDK with declarative UI layer and browser simulator for building E Ink applications
Capability-isolated runtime keeping each app running in an unprivileged process
Custom launcher maintaining a persistent route back to the stock Kobo reader
Built-in Gutenbird reader for accessing OPDS libraries such as Project Gutenberg and Standard Ebooks
Integrated apps including arXiv paper reader, Hacker News, Daily Brief, and AI Command Center
Panel-native terminal shell with direct touchscreen key input
Non-destructive design that returns to the stock reader interface upon reboot

Pricing

Free — plans below

Open Source

Most popular

Free

  • Full open-source launcher and App Store
  • Rust SDK and local browser simulator access
  • Wi-Fi app updates and installation
  • AGPL-3.0 licensed source code

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