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
- $14.01 price gap
- Product A has the lower captured price. This excludes delivery and ongoing costs.
- Editorial assessment
- 0.2-point score gap
- Product A 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- Outdated aesthetic compared to modern thermostats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
Google Nest Thermostat - Smart Thermostat for Home - Programmable Wifi
- Potential fit
- Basic Google ecosystem climate automation
- Trade-off to resolve
- Middling 4.1 user rating
Side-by-side evidence
24 of 24 recorded specification fields shown
| Side by side |  |  |
|---|---|---|
| Buyer rating | 4.4 | 4.1 |
| Price | $89.99 | $104.00 |
| Our score | 7.6/10 | 7.4/10 |
| Ratings count | 23,162 ratings | 29,810 ratings |
| Brand | Sensi | |
| Best for | DIY installers wanting a familiar thermostat design | Basic Google ecosystem climate automation |
| Installation flexibility | 8.8/10 | 6.5/10 |
| Hardware ergonomics | 7.4/10 | — |
| Smart home integration | 8.0/10 | — |
| Energy tracking | 7.6/10 | — |
| Protocol longevity | 6.2/10 | — |
| Hardware build | — | 7.0/10 |
| Ecosystem openness | — | 7.8/10 |
| Feature set | — | 7.5/10 |
| Value proposition | — | 8.0/10 |
| Power Source | Battery or C-wire | Battery Powered |
| Dimensions | 5.875" x 3.75" x 1.0" | Not recorded |
| Wi-Fi Connectivity | 2.4 GHz | Not recorded |
| Connectivity Technology | Wi-Fi | Wi-Fi |
| 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, Google Assistant, iOS, nest |
| Additional Features | Data Privacy, Easy DIY Install, Energy Savings, Filter Indicator, Programmable | Programmable |
| Specific Uses For Product | Air Conditioner, Boiler, Furnace, Heat Pump | Heat Pump |
| Temperature Control Type | Programmable, Smart/Remote | Heating, Cooling |
| Display Type | LED | LCD |
| Screen Size | Not recorded | 1.07 inches |
| Connectivity Protocol | Not recorded | Wi-Fi |
| Control Type | Not recorded | Button Control |
| Control Method | Not recorded | Voice |
| Mounting Type | Not recorded | Wall Mount |
| Number of Batteries | Not recorded | 2 AAA batteries required. (included) |
| Color | Not recorded | Snow |
| Shape | Not recorded | Round |
| 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. | Functionally identical to the Charcoal model, this unit offers the same app-based control at a slightly lower $117.45 price point. It lacks advanced sensor expansion found on higher-tier models and relies heavily on cloud infrastructure. HVAC wiring compatibility must be confirmed prior to purchase. |
| 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: September 25, 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 12, 2026.
- Amazon listing: Sensi Smart Thermostat, Wi-Fi, DIY, Alexa, Energy Star
- Amazon listing: Google Nest Thermostat - Smart Thermostat for Home
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