TRMNL: an e-ink display you buy once

TRMNL is a small e-ink panel, 7.5 inches on the OG model, that sits at an angle on a desk or hangs flat on a wall and shows whatever you have told it to show. The company's own line for it is "clarity, at a glance" (usetrmnl.com, read 2026-10-24): a calendar, the forecast, a stock ticker, a to-do list, or any of the plugins in its marketplace, rotating on a schedule you set rather than refreshing live like a monitor.

The hardware itself is a small part of the pitch. TRMNL's developer page states the firmware is GPL-3.0 licensed and the project has "over 50,000 devices deployed" (usetrmnl.com/developers, read 2026-10-24), and it leans on that openness directly: you can point a device at your own self-hosted server instead of TRMNL's, using one of six reference server implementations the team publishes. That combination, a finished consumer object with an open firmware underneath, is the main thing that separates it from a raw Raspberry Pi project on one side and a fully closed device like Tidbyt or LaMetric Time on the other.

The audience is anyone who wants one thing glanceable without opening a phone: a family calendar on the kitchen counter, a stock ticker at a desk, or a subway schedule by the door. It also suits a developer who wants to build a private plugin, since the account includes an HTML and Liquid based editor with a live previewer, but nothing about setup requires that: buying a device and picking plugins from the marketplace is enough on its own.

The Integrations page lists dozens of official plugins with live connection counts across categories tagged life, productivity, finance, news, travel and more (usetrmnl.com/integrations, read 2026-10-24). Weather is the single most used, at 26,573 connections; Google Calendar sits at 15,972, Days Left This Year at 9,974, Outlook Calendar at 1,995, and Stock Price at 4,484. Beyond the official list, a separate Recipes section holds community-submitted plugins, more than 1,250 of them combined, covering everything from a Swiss bus timetable to a Home Assistant screenshot.

Screens are arranged into playlists: choose from eight layouts, group plugins by time of day, and the device cycles through them on its own. Anyone with developer mode turned on can also build a private plugin using TRMNL's HTML and Liquid templating system, test it in a live previewer, and either keep it to themselves or publish it to the shared marketplace.

Self-hosting is a real, documented option rather than a footnote. TRMNL's developers page lists six BYOS (bring your own server) implementations across Ruby, PHP, TypeScript, JavaScript, Elixir and Python, four of them still actively maintained, so a device can be pointed entirely away from TRMNL's own servers (usetrmnl.com/developers, read 2026-10-24). The same page documents jailbreak guides for turning an old Kindle, Nook, Kobo, Android tablet or iPad into a TRMNL client instead of buying new hardware.

Buying a TRMNL OG or X is the direct route: unbox it, join it to Wi-Fi, and create an account at usetrmnl.com to start picking plugins. A Developer Edition add-on ($20) unlocks the API and private plugin building on a native device.

Bringing your own hardware costs a one-time $50 BYOD license, which unlocks the same web app and plugin API for a DIY ESP32-based build instead of TRMNL's own device. Going further, BYOS lets you skip TRMNL's servers entirely by running one of its open source reference server implementations yourself, at the cost of maintaining that server (usetrmnl.com/developers, read 2026-10-24). A free Raspberry Pi installer script and a set of community jailbreak guides for older e-readers and tablets cover the cheapest routes in, none of which require buying anything from TRMNL directly.

TRMNL OG is $139, once, and includes lifetime access to the web portal and software updates with no required subscription (help.trmnl.com, read 2026-10-24). TRMNL X, the larger 10.3 inch model, is $229; its product page listed shipping as same day for US, Canada and Australia orders and backlogged for Europe and Asia at this check (shop.trmnl.com/products/trmnl-x, read 2026-10-24). A Clarity Kit add-on ($25, discounted from $35) bundles a battery upgrade, the Developer Edition unlock, a charging cable and a cleaning cloth; the battery upgrade alone is $10.

The only recurring cost is optional. TRMNL+ is $5 a month per device and drops the per-plugin refresh floor from 15 minutes down to 5 minutes, raises the webhook payload limit from 5kb to 10kb, and allows up to 30 webhook calls an hour per private plugin instead of 12 (help.trmnl.com, read 2026-10-24). Nothing about running the device day to day requires it.

E-ink is slow by nature, and TRMNL leans into that rather than fighting it: without TRMNL+, no single plugin refreshes faster than every 15 minutes, which rules it out for anything that needs to feel live. The screen itself is grayscale on both current models, 4 levels on the OG and 16 on X, so photo plugins render in tones of gray rather than full color.

The web portal most people use day to day is closed source, even though the firmware underneath it is GPL-3.0 and self-hostable. Reaching that openness in practice means running your own BYOS server, which is documented and real but is still extra setup past what buying the device and signing in gets you.

The TRMNL X shipping schedule varies by region, with Europe and Asia backlogged at this check, so the larger screen is not an immediate purchase in every market. And while the OG's $139 price has no recurring cost attached, it is still a specific piece of hardware to buy and wait on, unlike a self-hosted framework you can start running on whatever screen you already have today.