Eyedro
Eyedro EYEFI-4 Home Energy Monitor
$139Cheaper
Best Home Energy Monitors · head-to-head
Eyedro EYEFI-4 Home Energy Monitor vs Refoss EM16P Smart Energy Monitor
A sourced, side-by-side comparison. Eyedro EYEFI-4 Home Energy Monitor is cheaper at $139. Every spec and price links to its source.
Refoss
Refoss EM16P Smart Energy Monitor
$199.99
Which is better: the Eyedro EYEFI-4 Home Energy Monitor or Refoss EM16P Smart Energy Monitor?
On the specs we track, they're closely matched. The Eyedro EYEFI-4 Home Energy Monitor is the cheaper at $139.
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Eyedro EYEFI-4 Home Energy Monitor | Refoss EM16P Smart Energy Monitor |
|---|---|---|
| US price | $139 MSRP from eyedro.com. | $199.99 |
| Brand | Eyedro | Refoss |
| Released | — | — |
| Monitoring type | ct-clamp | ct-clamp |
| Main circuit amps | 200 | 200 |
| Branch circuit count | 0 | 16 |
| Connectivity protocol | Wi-Fi 802.11 b/g/n | Wi-Fi |
| Solar net metering | Yes | Yes |
| Local api support | Yes | Yes |
| Subscription required | No | No |
| App platforms | web (MyEyedro) | web UI (local), cloud optional |
| Accuracy percent | 1 | 2 |
| Installation type | external-ct (no panel wiring) | panel-mount |
| Smart home integrations | — | Home Assistant (native), MQTT |
| Etl ul certified | UL 61010-1, CSA C22.2#61010-1 | ETL (UL 61010) |
Sources — Eyedro EYEFI-4 Home Energy Monitor: eyedro.com (verified 2026-06-27). Refoss EM16P Smart Energy Monitor: refoss.net (verified 2026-06-27).
What's the difference between the Eyedro EYEFI-4 Home Energy Monitor and Refoss EM16P Smart Energy Monitor?
Where the two actually differ on the specs we track (6 of 12). Matching specs are omitted.
- Branch circuit count: Eyedro EYEFI-4 Home Energy Monitor 0 vs Refoss EM16P Smart Energy Monitor 16
- Connectivity protocol: Eyedro EYEFI-4 Home Energy Monitor Wi-Fi 802.11 b/g/n vs Refoss EM16P Smart Energy Monitor Wi-Fi
- App platforms: Eyedro EYEFI-4 Home Energy Monitor web (MyEyedro) vs Refoss EM16P Smart Energy Monitor web UI (local), cloud optional
- Accuracy percent: Eyedro EYEFI-4 Home Energy Monitor 1 vs Refoss EM16P Smart Energy Monitor 2
- Installation type: Eyedro EYEFI-4 Home Energy Monitor external-ct (no panel wiring) vs Refoss EM16P Smart Energy Monitor panel-mount
- Etl ul certified: Eyedro EYEFI-4 Home Energy Monitor UL 61010-1, CSA C22.2#61010-1 vs Refoss EM16P Smart Energy Monitor ETL (UL 61010)