Cobalt, an SDK to build apps for Kobo eReaders
Details
- External ID
- 49141871
- Source
- HN
- Company
- —
- Product
- Cobalt, an SDK to build apps for Kobo eReaders
- Website domain
- github.com
- Launched
- Aug. 2, 2026
- Cohort
- —
- Upvotes
- 5
- Upvotes percentile
- 0.12634408602150538
- Tags
- —
- Fetched at
- Sept. 10, 2026, 5:32 a.m.
- Updated at
- Sept. 10, 2026, 5:32 a.m.
Description
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.
Enrichment
- Theme
- utilities for Claude and Claude Code
- Vertical
- Horizontal
- Function
- Dev tools
- Audience
- Developer
- AI stance
- Not AI
- Project type
- Commercial product
- Normalized one-liner
- sdk for building apps on kobo ereaders
- Manually corrected
- False
Could you build this?
No Building an embedded SDK and runtime environment for proprietary Kobo e-reader hardware requires embedded Linux toolchains, direct frame buffer/e-ink waveform manipulation, and cross-compilation toolsets.
What it would actually take: Requires setting up cross-compilation toolchains (GCC/Clang targetting ARMv7 Linux), hooking directly into `/dev/fb0` or Kobo's Nickel display server, handling custom EPDC (Electronic Paper Display Controller) ioctls for e-ink refresh modes, and capturing input events from `/dev/input/event*`. Specialized expertise in embedded Linux, hardware driver interfaces, and e-ink refresh management is required.
Discussion
No comments on this launch.
Competitors
Other products that read as similar to this one — 22 launches clear the similarity bar, closest 8 shown.
Attention rank: #20 of 23 (itself plus its competitors, highest first — normalized so YC and Product Hunt are compared fairly).
Launched 265 days after the earliest competitor.
- E-Ink Optimized Manga for KOreader, Kindle, Kobo, ReMarkable with KCC · hn · 2026-08-31 · 6 upvotes · similarity 0.40
- Kodo · ph · 2026-09-07 · 1 upvotes · similarity 0.38
- I built an open-source Linux-capable single-board computer with DDR3 · hn · 2025-12-24 · 17 upvotes · similarity 0.36
- Koi Editor Alpha · hn · 2026-09-18 · 6 upvotes · similarity 0.36
- Using 2D DFT, dithering, etc. to maximize eInk manga image quality · hn · 2026-09-28 · 67 upvotes · similarity 0.35
- Anna's Kobo · ph · 2026-09-17 · 2 upvotes · similarity 0.33
- eink-dashboard · github · 2026-09-12 · 7 upvotes · similarity 0.33
- TinyJS · hn · 2026-09-01 · 8 upvotes · similarity 0.33
Other launches for this product
- No other launches for this product.
Same idea, different domain
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