ersa.wearable

Your watch.
Your software.

An open e-paper watch platform with first-class ANCS and AMS support for iPhone. Your notifications, calls, and music—right on your wrist.

FIRST-CLASS ANCS + AMS


Built-in support for Apple Notification Center Service and Apple Media Service over Bluetooth LE. Keep your phone in your pocket and the essentials on your wrist.

ANCS · Notifications and calls.

See iPhone notifications and caller details directly on your watch.

AMS · Your music, in reach.

View Now Playing information and control supported media from your wrist.

ersa.wearable running its text watchface in its transparent case

ON THE WATCH

A monochrome interface designed for a 200 × 200 e-paper display. Keep the essentials readable and the controls straightforward.

A readable watchface.

Time and date in a clear text layout on the e-paper display.

Two-button navigation.

Scroll through the app drawer and select what you need with physical buttons.

Text watchface showing the time and dateApp drawer navigated with two buttons

CALDAV + NEXTCLOUD


Bring your Nextcloud calendar and task lists to your wrist. A local cache keeps the last sync available.

Your calendar, including repeats.

Read upcoming events and recurring appointments in the daily agenda.

Check things off.

View your synced task lists and mark tasks complete from the watch.

Calendar agenda on the watchSynced task checklist on the watch

FLASH + UPDATE


Install the firmware over USB, then keep your watch updated over the air.

Flash from your browser.

Connect a supported ESP32 board over USB and follow the flasher.

Update over the air.

Install firmware updates through the watch’s OTA update support.

An ESP32 development board connected over USB
Watch system status showing device diagnostics

SUPPORTED HARDWARE


The Ampere Works T1E is the first supported target: an e-paper watch with two buttons and an ESP32-C3 at its core.

BOARD
XIAO ESP32-C3
DISPLAY
1.54″ e-paper · 200 × 200
TIMEKEEPING
DS3231 real-time clock
INPUT
Two physical buttons