Updated March 2026
Data from Amazon and official Fibaro and Sonoff sites.
2026 verdict
For most buyers in 2026, Sonoff Wifi Smart Plug S40 is the safer pick. It builds its lead on price, rating, and connectivity, then backs it up with a stronger showing on integrations. You should still consider Fibaro Wall Plug with USB (US) if its specific feature mix matters more than raw overall balance. In practical terms, Sonoff Wifi Smart Plug S40 is the easier product to recommend.
| Feature | Fibaro Wall Plug with USB (US) | Sonoff Wifi Smart Plug S40 | Winner |
|---|---|---|---|
| Price | $51.28 | $18.99 | Sonoff Wifi Smart Plug S40 |
| Rating | 3.9 | 4.4 | Sonoff Wifi Smart Plug S40 |
| Connectivity | Z-Wave | 2.4 GHz Wifi, Bluetooth | Sonoff Wifi Smart Plug S40 |
| Integrations | Alexa, Home Assistant | Google Home, Alexa, Samsung SmartThings, Home Assistant, IFTTT | Sonoff Wifi Smart Plug S40 |
| Warranty | 1 year | 1 year | Tie |
| Weather Resistance | NO | NO | Tie |
| Plug Format | Type B | Type B | Tie |
| Maximum Load Power | 1800W | 1800W | Tie |
| Overheat/Overload Protection | YES | YES | Tie |
| Energy Monitoring | YES | YES | Tie |
| On/Off Button | YES | YES | Tie |
| Zibgee Router | NO | NO | Tie |
$51.28
- - Price: $51.28 vs $18.99
- - Rating: 3.9 vs 4.4
Winner
$18.99
- + Price: $18.99
- + Rating: 4.4
- + Connectivity: 2.4 GHz Wifi, Bluetooth
Frequently Asked Questions (FAQ)
- Which is better overall: Fibaro Wall Plug with USB (US) or Sonoff Wifi Smart Plug S40?
- Sonoff Wifi Smart Plug S40 has the stronger overall profile in this comparison, especially for price, rating, and connectivity.
- What is the biggest difference between Fibaro Wall Plug with USB (US) and Sonoff Wifi Smart Plug S40?
- Price is one of the clearest differences: Fibaro Wall Plug with USB (US) lists $51.28, while Sonoff Wifi Smart Plug S40 lists $18.99.
- Which one looks better on price?
- Fibaro Wall Plug with USB (US) is listed at $51.28, while Sonoff Wifi Smart Plug S40 is listed at $18.99. Sonoff Wifi Smart Plug S40 (better spec).
- Who should buy Fibaro Wall Plug with USB (US)?
- Choose Fibaro Wall Plug with USB (US) if your priority is its specific strengths and that matters more than price.
- Who should buy Sonoff Wifi Smart Plug S40?
- Choose Sonoff Wifi Smart Plug S40 if your priority is price and rating and that matters more than the competing advantages.
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