The $48 e-paper display that can be whatever you want it to be

The idea of an informational dashboard has always seemed bound to screens — whether LCD, OLED, or LED. But the TRMNL 7.5" DIY Kit, a development kit based on e-ink technology sold by Seeed Studio for around $48, offers a fundamentally different proposition: a personalized display that fits any space without the distraction, glow, or power drain of a conventional screen. The project, a collaboration between Seeed Studio and the TRMNL platform, represents an alternative approach in the personal dashboard space — a device that shows the information you care about without notifications, glowing screens, or the subtle attention-grabbing that defines modern displays.

What is TRMNL?

TRMNL (pronounced like "trim" — to cut away the unnecessary) is an e-ink-based dashboard platform designed to be the opposite of a smartphone screen. Founded in 2023, the company emerged from the premise that most digital information devices are designed to distract you rather than help you focus. The hardware itself is refreshingly simple: a 7.5-inch monochrome display with 800×480 pixel resolution, a rechargeable USB-C battery, and an ESP32-C3 processor running open-source firmware under the GPLv3 license.

The magic is in the software. TRMNL connects to your Wi-Fi (2.4 GHz) and pulls data from external sources — calendars, weather, productivity metrics, server status, news feeds — rendering everything as clean, readable panels that auto-refresh at configurable intervals, typically every 15 minutes. The device draws power in the microwatt range when idle, meaning a 1800 to 2500 mAh battery lasts three to six months in typical use.

The plugin ecosystem

What sets TRMNL apart from other e-ink displays on the market is the depth of its plugin ecosystem. With over 500 ready-to-use plugins — up from 300 in early 2025 to over 905 by mid-2026 — and eight pre-built layouts, users can build a completely customized dashboard without writing code. Plugins cover everything from Google Calendar and Home Assistant integrations to the International Space Station tracker, server performance metrics, and social media feeds.

The platform offers two usage paths: TRMNL's proprietary cloud, which is the simplest option, or BYOD (Bring Your Own Device), a license that allows self-hosted servers. This means sensitive data never needs to leave your network — the device pulls information from the server in a one-way communication architecture that ensures no data leaves your environment.

DIY and open-source

The Seeed Studio DIY Kit includes everything needed to get started: the 7.5-inch e-ink display, an XIAO ESP32-S3 PLUS controller board, a 2000 mAh battery, and a 10 cm FPC cable. The firmware is open-source and the community already produces projects for Home Assistant, ESPHome, and Arduino integration. You can connect home energy consumption metrics, display your Docker lab's status, or simply use it as a family calendar board.

If you're into DIY projects — and if you're into e-ink displays, which is already a passionate niche — TRMNL opens possibilities that no conventional tablet or smart display can match. The ultra-low power consumption, absence of backlight, and ability to maintain an image without power create a product category that doesn't exist in any other platform.

Why this matters

E-ink technology has existed since the 2000s, but has always been confined to e-book readers. Devices like the reMarkable and Kindle show that the market recognizes the value of screens that don't fatigue the eyes, but they are closed products with limited functionality. TRMNL, with its open-source approach and "less is more" philosophy, demonstrates that e-ink can be far more than a passive alternative to OLED or LCD: it can be the foundation for a new category of interfaces that put useful information at your hand without the cognitive cost of a smartphone screen.

While conventional smart displays fight against the intrinsic problem that every glowing screen attracts attention, TRMNL does the opposite: it shows what matters and then visually disappears, like paper on a wall. In a world saturated with notifications, this might be the most important $48 innovation you'll encounter this year.

Sources: The Gadgeteer, Seeed Studio Blog, TRMNL

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