Tool
Compare two products
Pick any two products from our reviews and see specifications, price, buyer ratings and our scores in one table.
Recorded evidence
What separates these listings
- Price snapshot
- $149.00 price gap
- Product A has the lower captured price. This excludes delivery and ongoing costs.
- Editorial assessment
- 0.6-point score gap
- Product B has the higher research score, not a measured performance advantage.
- Specification coverage
- 8 of 24 fields shared
- Shared labels have recorded values on both sides; matching labels do not guarantee matching units or test conditions.
Product A
Sensi Smart Thermostat, Wi-Fi, DIY, Alexa, Energy Star Certified, ST55
- Potential fit
- DIY installers wanting a familiar thermostat design
- Trade-off to resolve
- Outdated aesthetic compared to modern thermostats
Product B
ecobee Smart Thermostat Premium - WiFi, Siri & Alexa Built-In, Smart Sensor
- Potential fit
- Homes needing targeted multi-room temperature monitoring
- Trade-off to resolve
- Premium price point relative to basic connected thermostats
Side-by-side evidence
24 of 24 recorded specification fields shown
| Side by side |  |  |
|---|---|---|
| Buyer rating | 4.4 | 4.3 |
| Price | $89.99 | $238.99 |
| Our score | 7.6/10 | 8.2/10 |
| Ratings count | 23,162 ratings | 4,219 ratings |
| Brand | Sensi | ecobee |
| Best for | DIY installers wanting a familiar thermostat design | Homes needing targeted multi-room temperature monitoring |
| Installation flexibility | 8.8/10 | — |
| Hardware ergonomics | 7.4/10 | — |
| Smart home integration | 8.0/10 | — |
| Energy tracking | 7.6/10 | — |
| Protocol longevity | 6.2/10 | — |
| Build quality | — | 8.5/10 |
| HVAC compatibility | — | 9.0/10 |
| Platform integration | — | 8.0/10 |
| Local autonomy | — | 7.2/10 |
| Overall value | — | 8.3/10 |
| Power Source | Battery or C-wire | Corded Electric |
| Dimensions | 5.875" x 3.75" x 1.0" | Not recorded |
| Wi-Fi Connectivity | 2.4 GHz | Not recorded |
| Connectivity Technology | Wi-Fi | Bluetooth |
| Voltage | 24 volts_of_alternating_current | 24 volts |
| Remote Access | Yes | Not recorded |
| Usage Reports | Yes | Not recorded |
| Energy Star Certified | Yes | Not recorded |
| Smart Alerts | Yes | Not recorded |
| Backlight | Yes | Not recorded |
| Keypad Lockout | Yes | Not recorded |
| Controller Type | Amazon Alexa, Apple HomeKit, Google Assistant, SmartThings, Vera | Amazon Alexa, Android, Apple HomeKit, Google Assistant, iOS |
| Additional Features | Data Privacy, Easy DIY Install, Energy Savings, Filter Indicator, Programmable | Amazon Alexa, Siri, Wired Smart Thermostat |
| Specific Uses For Product | Air Conditioner, Boiler, Furnace, Heat Pump | Air Conditioner, Boiler, Dehumidifier, Electric Baseboard Heater, Furnace, Heat Pump, Humidifier |
| Temperature Control Type | Programmable, Smart/Remote | Cooling |
| Display Type | LED | LCD |
| Connectivity Protocol | Not recorded | Wi-Fi |
| Control Type | Not recorded | Touchpad Control |
| Control Method | Not recorded | App |
| Mounting Type | Not recorded | Wall Mount |
| Number of Batteries | Not recorded | 1 Lithium Ion batteries required. (included) |
| Color | Not recorded | Black |
| Shape | Not recorded | Round |
| Product Style | Not recorded | Smart Thermostat Premium |
| Our verdict | The Sensi ST55 keeps a traditional thermostat form factor while adding Wi-Fi control and Alexa support for $79.99. It earns a reliable 4.4 rating, often praised for straightforward DIY installation compared to modern puck-style designs. The classic display is utilitarian, avoiding touchscreens in favor of physical buttons. | The ecobee Smart Thermostat Premium sits at the higher end of the category, combining an external remote sensor with onboard Siri and Alexa access. While HomeKit compatibility offers a degree of local command, broader operation remains tied to standard Wi-Fi and manufacturer cloud services rather than emerging local standards like Thread. Buyers should confirm HVAC wire compatibility before purchase and decide whether integrated microphones belong on their wall. |
| Pros and cons |
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Prices and buyer ratings are captured snapshots. A dash means the detail was not recorded, not that a feature is absent. Editorial scores are research assessments, not laboratory measurements.
Sources and limits
This page summarizes our research reviews of Amazon listings, listed specifications and captured buyer ratings. It is not a hands-on test. Scores are editorial assessments, not measured performance; prices are recorded snapshots and may change. A category can include both main products and accessories, so its overall price range is not the cost of a complete setup.
Most recent product record update: October 3, 2026. Individual records may be older; this is not a verification date for every claim. Prices on this page were read from the listings Nov 8, 2026 – Nov 12, 2026.
- Amazon listing: Sensi Smart Thermostat, Wi-Fi, DIY, Alexa, Energy Star
- Amazon listing: ecobee Smart Thermostat Premium - WiFi, Siri & Alexa
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