Eyedro
Eyedro EYEFI-4 Home Energy Monitor
$139Cheaper
Best Home Energy Monitors · head-to-head
Eyedro EYEFI-4 Home Energy Monitor vs IotaWatt Open WiFi 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.
IotaWatt / CircuitIQ
IotaWatt Open WiFi Energy Monitor
$389
Which is better: the Eyedro EYEFI-4 Home Energy Monitor or IotaWatt Open WiFi 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 | IotaWatt Open WiFi Energy Monitor |
|---|---|---|
| US price | $139 MSRP from eyedro.com. | $389 |
| Brand | Eyedro | IotaWatt / CircuitIQ |
| Released | — | — |
| Monitoring type | ct-clamp | ct-clamp |
| Main circuit amps | 200 | — |
| Branch circuit count | 0 | 14 |
| 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 (local) |
| Accuracy percent | 1 | — |
| Installation type | external-ct (no panel wiring) | panel-mount |
| Smart home integrations | — | Home Assistant, Emoncms, PVOutput, InfluxDB |
| Etl ul certified | UL 61010-1, CSA C22.2#61010-1 | ETL (UL + CSA) |
Sources — Eyedro EYEFI-4 Home Energy Monitor: eyedro.com (verified 2026-06-27). IotaWatt Open WiFi Energy Monitor: stuff.iotawatt.com (verified 2026-06-27).
What's the difference between the Eyedro EYEFI-4 Home Energy Monitor and IotaWatt Open WiFi Energy Monitor?
Where the two actually differ on the specs we track (5 of 12). Matching specs are omitted.
- Branch circuit count: Eyedro EYEFI-4 Home Energy Monitor 0 vs IotaWatt Open WiFi Energy Monitor 14
- Connectivity protocol: Eyedro EYEFI-4 Home Energy Monitor Wi-Fi 802.11 b/g/n vs IotaWatt Open WiFi Energy Monitor Wi-Fi
- App platforms: Eyedro EYEFI-4 Home Energy Monitor web (MyEyedro) vs IotaWatt Open WiFi Energy Monitor web (local)
- Installation type: Eyedro EYEFI-4 Home Energy Monitor external-ct (no panel wiring) vs IotaWatt Open WiFi Energy Monitor panel-mount
- Etl ul certified: Eyedro EYEFI-4 Home Energy Monitor UL 61010-1, CSA C22.2#61010-1 vs IotaWatt Open WiFi Energy Monitor ETL (UL + CSA)