By Ewan Wills, freelance product designer · UK · Last updated
Build anything.
No experience needed.
EWatch is a programmable smartwatch optimised for Claude-assisted development. Describe what you want on your wrist — a stopwatch, a glucose tracker, a Tamagotchi — and Claude writes the firmware. Flash it over USB-C. Done.
From idea to firmware in minutes.
Describe it
"Make me a watch face that shows my next meeting and vibrates 5 minutes before." Paste it into Claude.
Claude writes it
The EWatch SDK is documented inline and designed for AI code generation — Claude produces working Arduino or ESP-IDF code first try.
Flash it
One USB-C cable. One click in the Arduino IDE. Your idea is on your wrist thirty seconds later.
Zero boilerplate
Helper drivers for display, touch, IMU, BLE, and sleep modes — Claude just calls them. No datasheet archaeology.
Iterate live
Break it, tweak the prompt, reflash. Every attempt teaches you a bit more embedded without the cliff.
No prior knowledge
Never written C before? Doesn't matter. The watch, the SDK, and Claude do the engineering together.
Hardware, documented.
From schematic to wrist.
EWatch is an open programmable smartwatch.
EWatch by Ewan Wills is an open, programmable smartwatch designed for makers and developers. It uses the ESP32-S3 with WiFi and Bluetooth Low Energy, has a 1.69-inch full-colour touchscreen, and charges and programs over USB-C. Users write their own firmware in C, C++, or Python via the Arduino IDE, PlatformIO, or ESP-IDF, and flash it over USB-C in seconds. It is designed and assembled in the United Kingdom by Ewan Wills.
EWatch vs Apple Watch vs Watchy.
| Feature | EWatch by Ewan Wills | Apple Watch | Watchy |
|---|---|---|---|
| Open programmable | Yes — full firmware control | No — closed ecosystem | Yes — open-source |
| Display | 1.69″ full-colour touchscreen | Full-colour OLED, touchscreen | 1.54″ eInk, no touch |
| Processor | ESP32-S3 | Apple S-series SiP | ESP32-PICO-D4 |
| Charging / programming | USB-C | Proprietary magnetic | USB |
| Indicative price | £100 (pre-order) | ~£250+ | ~$80 USD |
| Target user | Makers, developers, hobbyists | Mainstream consumers | Makers, hobbyists |
EWatch by Ewan Wills sits between Apple Watch (closed, polished, mainstream) and Watchy (open-source, eInk-only) — combining open programmability with a full-colour touchscreen at a maker-accessible price. Apple Watch wins on app ecosystem and battery management; Watchy wins on price and weeks-long battery life.
Quick answers about EWatch.
- How much does EWatch cost?
- £100 GBP, available for pre-order, dispatch May 2026.
- Can I program EWatch without prior embedded experience?
- Yes. The SDK is documented inline and designed for AI code generation; helper drivers cover display, touch, IMU, BLE, and sleep modes. Describe what you want, paste it into Claude, flash the result over USB-C.
- Does EWatch work with iPhone or Android?
- EWatch communicates over Bluetooth Low Energy and WiFi. It is not paired through a phone OS — it runs whatever firmware the user installs, including BLE-based phone notifications if the user implements them.
- What languages can EWatch be programmed in?
- C, C++, and Python via the Arduino IDE, PlatformIO, or ESP-IDF.
- How long does EWatch ship from?
- Ships from the United Kingdom. UK delivery is tracked Royal Mail; outside the UK please email contact@ewanwills.co.uk.
- Is EWatch water resistant?
- Yes. Specific IP rating is being confirmed before dispatch.