# Eyedro EYEFI-4 Home Energy Monitor vs Shelly 3EM Smart 3-Phase Energy Meter: specs and price compared

A sourced, side-by-side comparison of the Eyedro EYEFI-4 Home Energy Monitor (Eyedro) and Shelly 3EM Smart 3-Phase Energy Meter (Shelly) among home energy monitors. Shelly 3EM Smart 3-Phase Energy Meter is the cheaper of the two at $121.49.

## Side by side

| Spec | Eyedro EYEFI-4 Home Energy Monitor | Shelly 3EM Smart 3-Phase Energy Meter |
| --- | --- | --- |
| US price | $139 | $121.49 |
| Brand | Eyedro | Shelly |
| Monitoring type | ct-clamp | ct-clamp |
| Main circuit amps | 200 | 120 |
| Branch circuit count | 0 | 0 |
| Connectivity protocol | Wi-Fi 802.11 b/g/n | Wi-Fi 802.11 b/g/n |
| Solar net metering | Yes | Yes |
| Local api support | Yes | Yes |
| Subscription required | No | No |
| App platforms | web (MyEyedro) | iOS, Android, web |
| Accuracy percent | 1 | — |
| Installation type | external-ct (no panel wiring) | din-rail |
| Smart home integrations | — | Home Assistant, Alexa, Google Home, MQTT, CoAP, REST API |
| Etl ul certified | UL 61010-1, CSA C22.2#61010-1 | — |

## Key differences

- Main circuit amps: Eyedro EYEFI-4 Home Energy Monitor 200 vs Shelly 3EM Smart 3-Phase Energy Meter 120
- App platforms: Eyedro EYEFI-4 Home Energy Monitor web (MyEyedro) vs Shelly 3EM Smart 3-Phase Energy Meter iOS, Android, web
- Installation type: Eyedro EYEFI-4 Home Energy Monitor external-ct (no panel wiring) vs Shelly 3EM Smart 3-Phase Energy Meter din-rail

## Sources

- Eyedro EYEFI-4 Home Energy Monitor: https://eyedro.com/product/eyefi-4/ (eyedro.com, verified 2026-06-27)
- Shelly 3EM Smart 3-Phase Energy Meter: https://us.shelly.com/products/shelly-3em (us.shelly.com, verified 2026-06-27)

Canonical: https://frontdeskreview.com/gear/home-energy-monitors/eyedro-home-energy-monitor-vs-shelly-3em/
Cite: Per The Front Desk Review, Eyedro EYEFI-4 Home Energy Monitor ($139) vs Shelly 3EM Smart 3-Phase Energy Meter ($121.49) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/home-energy-monitors/eyedro-home-energy-monitor-vs-shelly-3em/
License: CC BY 4.0.