⏱️ Lectura: 9 min
An e-reader with no physical buttons, no apps, and not a single line of Linux just surpassed its funding goal on Crowd Supply. Open Book Touch, from the studio Oddly Specific Objects, raised $46,393 against a goal of $45,000 (103%) with 240 backers, and the campaign is still open.
📑 En este artículo
It’s the first version in the Open Book family to read EPUB files natively, with justified typography and support for dozens of writing systems. All the hardware, designed in KiCad, and the firmware are open source.
TL;DR
- Open Book Touch surpassed its funding goal: $46,393 raised against a $45,000 ask (103%) with 240 backers on Crowd Supply.
- The campaign closes on August 20, 2026 at 4:59 PM PDT.
- Pricing ranges from $149 to $249 depending on the purchase tier chosen.
- 4.26-inch e-paper display with 480×800 pixels, the same pixel density as 7.5-inch panels.
- It’s the first Open Book to read EPUB natively, in addition to plain text.
- It runs C++ firmware on top of ESP-IDF and FreeRTOS, draws less than 1 milliamp, and doesn’t use Linux.
- All the hardware, designed in KiCad, and the software are open source.
- The interface is localized in 7 languages: English, Spanish, French, German, Japanese, Arabic, and Hebrew.
Introduction
Most e-readers on the market, from the Kindle to the Kobo, are closed devices: proprietary firmware, closed stores, and updates that depend on the manufacturer. Open Book Touch proposes the opposite. It’s a single-purpose device, reading books, built entirely with open hardware and software, designed so that anyone can audit, modify, or repair it.
The project belongs to Oddly Specific Objects, a studio that designs objects with a deliberate set of trade-offs: Open Book Touch has no browser, sends no notifications, and isn’t meant for extensive note-taking. Its Wi-Fi exists only to sync the time and download books, nothing more.
What happened
The Open Book Touch campaign on Crowd Supply surpassed its $45,000 goal: as of this writing, it has raised $46,393 (103% of the goal) thanks to 240 backers. Funding remains open and closes on August 20, 2026 at 4:59 PM Pacific Time (PDT).
The device can be pre-ordered in tiers ranging from $149 to $249, depending on the purchase options the campaign offers. The team has already published two updates since launch: the first announcing that, after six years of development, the device is now real, and the second detailing search functions, text highlighting, and built-in dictionaries.
Background and history
The origin of Open Book Touch dates back to 2019, when its creator discovered GNU Unifont, a bitmap font with a glyph for nearly every character in the Unicode standard. The original idea was simple and ambitious at once: build a device capable of putting every language in the world in the palm of a hand.
Earlier versions of Open Book fulfilled only part of that promise. They could display plain text, with no covers, no careful typography, and no real EPUB support. Open Book Touch is, according to the team itself, the first time that original goal is fully realized: an interface with dithered black-and-white book covers, justified typography, and rendering for dozens of different writing systems.
Technical details and performance
Open Book Touch uses a 4.26-inch e-paper panel with 480×800 pixels, the same resolution normally found on 7.5-inch screens. That means a notably higher pixel density than most pocket e-readers, something that shows in both the text and the one-bit dithered covers.
The screen is 1-bit in its fast mode (pure black and white), used for turning pages and navigating the interface. There’s also a 2-bit grayscale mode, richer but slower to draw (several seconds), reserved for the lock screen: the cover of the current book or a personal photo.
The front light module combines warm and cool LEDs, with brightness and color temperature adjustable independently. That allows reading in bed with a dim warm light, or outdoors with a brighter, cooler light, without being tied to a single fixed color temperature.
💭 Key point: Open Book Touch draws less than 1 milliamp because it runs microcontroller firmware in C++ on top of ESP-IDF and FreeRTOS, not a full operating system like Linux. It boots straight into the book you were reading.
Typography is another of the project’s strong points. Books are composed with hand-drawn bitmap versions of Lucida Bright and Lucida Sans, in three sizes and with real bold and italic in each weight, not simulated in software. Both families were released as open source by Sun Microsystems in 1989.
The composition engine justifies lines with even word spacing, hyphenates at the correct points (with dictionaries for English, Spanish, French, and Italian), and breaks pages cleanly. Images embedded in an EPUB render inline, with one-bit dithering to look sharp on the e-paper display.
For languages outside the Latin script, Open Book Touch uses GNU Unifont as a universal fallback: nearly 70,000 glyphs covering most of the world’s writing systems. The interface is localized in English, Spanish, French, German, Japanese, Arabic, and Hebrew, and the firmware implements the Unicode bidirectional algorithm along with letter shaping for Perso-Arabic languages, so Arabic and Hebrew read right to left with letters connecting correctly.
| Feature | Open Book (previous versions) | Open Book Touch |
|---|---|---|
| Supported formats | Plain text | EPUB and plain text |
| Interface | Simple text list | Book covers with dithered graphic design |
| Writing systems | Limited coverage | Dozens of systems via GNU Unifont, with bidi and letter shaping |
Firmware architecture
The firmware runs on a microcontroller, not a full operating system, so the path from the EPUB file to the pixel on screen is short and predictable:
flowchart TD
A["MicroSD: EPUB or TXT"] --> B["EPUB Parser"]
B --> C["Typography engine"]
C --> D["1-bit buffer"]
D --> E[("e-paper panel 480x800")]
F["ESP-IDF FreeRTOS firmware"] --> B
F --> CHow to start trying it
Since Open Book Touch hasn’t been manufactured yet (the campaign remains open until August 20, 2026), there are two ways to get started today: pre-order a unit on Crowd Supply, or look at the code and hardware design to understand how it works before it arrives.
To pre-order, the published tiers range from $149 to $249 depending on the purchase options on the official campaign page. For those who want to look at or modify the firmware, the typical workflow with ESP-IDF is this:
# clone the firmware repository
# (the exact URL is published on the project's Crowd Supply page)
git clone <firmware-repository-url>
cd openbook-touch-firmware
idf.py set-target esp32s3
idf.py build</firmware-repository-url>This block downloads the code, sets the target to the chip the device uses, and compiles the firmware. The result is a binary ready to flash.
To flash the firmware onto the board, the command only changes in the serial port name depending on the operating system:
# Linux
idf.py -p /dev/ttyACM0 flash monitor
# macOS
idf.py -p /dev/cu.usbmodem14201 flash monitor
# Windows (PowerShell)
idf.py -p COM5 flash monitorflash writes the binary to the board and monitor opens the serial log to watch the boot live: if everything went well, the device shows the startup screen within seconds, the most direct way to confirm the firmware is active.
⚠️ Heads up: while the campaign is active, the physical hardware hasn’t shipped yet. The firmware workflow is useful for studying the project or preparing ahead, not for testing it on your own device before shipping.
Impact and analysis
The e-reader market is dominated by closed platforms. Amazon controls the Kindle’s catalog and DRM; Kobo and other manufacturers impose their own format rules. A device that reads EPUB without DRM, with hardware documented in KiCad and firmware anyone can recompile, is a different proposition: the user decides which books to load and how to modify the device.
The fact that Open Book Touch surpassed its goal with 240 backers doesn’t make it a mass-market product, it’s far from the volumes of Amazon or Rakuten, but it does confirm there’s a community willing to pay more for an open, repairable device, even if that means giving up a built-in store catalog.
The project’s most honest limitation is the one the team itself acknowledges: it’s not a tablet. There’s no browser, no notifications, and it’s not meant for extensive note-taking or complex tasks on its touch keyboard, which is designed only for simple functions. Anyone looking for a multipurpose device should look at a different product category.
What’s next
With the campaign still open until August 20, 2026, what’s next is seeing whether Open Book Touch keeps adding backers beyond the 103% already reached, and whether the team meets the shipping schedule once funding closes. The hardware and firmware repository, open from day one, lets the community follow development without relying solely on official announcements.
📖 Summary on Telegram: View summary
Try it yourself: check out the Open Book Touch Crowd Supply page and review the $149 to $249 tiers before the campaign closes on August 20, 2026.
Frequently Asked Questions
What file formats does Open Book Touch read?
It reads EPUB and plain text files directly from a microSD card, without going through a store or DRM.
Does it run Android or Linux?
No. It runs C++ firmware on top of ESP-IDF and FreeRTOS, meaning a microcontroller, not a full operating system.
How much does it cost and when does the campaign close?
Tiers range from $149 to $249, and the Crowd Supply campaign closes on August 20, 2026 at 4:59 PM PDT.
Is the hardware really open?
Yes. The design is done in KiCad, and both the hardware and firmware are published as open source.
Does it have full internet access?
It has Wi-Fi, but only to sync the time and download books. It doesn’t include a browser or notifications.
What languages is the interface available in?
Currently in English, Spanish, French, German, Japanese, Arabic, and Hebrew, with more languages planned for the future.
References
- Crowd Supply: official page of the Open Book Touch campaign, with specs, pricing tiers, and updates.
- GNU Unifont: the universal bitmap font Open Book Touch uses as a fallback to render Unicode.
- ESP-IDF Documentation: the framework the device’s C++ firmware runs on.
- KiCad: the open source electronic design suite used for Open Book Touch’s hardware.
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Imagen destacada: Foto de Tomasz Sroka en Unsplash
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