Cobalt, an SDK to build apps for Kobo eReaders
Hey HN, I built an SDK to help me create apps I wanted on my Kobo. My Kobo device has a single core <1GHz processor and 512MB RAM, much less than a Raspberry Pi, but the eInk display and larger battery life opens up a lot of use cases. I have since used it to build an approval sidekick for my Mac's Claude code and codex, a Hacker News Client for Kobo, a Gutenberg reader, an RSS search and reader and more. All the code is in the repo. If you have a different device than mine (Clara BW) would love for you to test it on your device and submit a PR to enable this for more device profiles. Thanks.
Cobalt, an SDK to build apps for Kobo eReaders launched on August 2, 2026 with 5 votes, #1,809 of 23,274 launches that month and more than 75% of that year's launches.
What it does
SDK for building apps & an app store for your Kobo eInk reader - BandarLabs/Cobalt
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