Best Smart Smoke and CO Detectors 2026: 7 Compared (9 Sources)
What are the best smart smoke and CO detectors in 2026?
Summary
The smart smoke and CO detector market in 2026 is undergoing its biggest shakeup in a decade. Google discontinued the Nest Protect in March 2025 after 11 years as the category leader, partnering with First Alert to produce the SC5 as its official replacement (street price now $111-$134). Meanwhile, Amazon's Ring partnered with Kidde to launch Wi-Fi-connected smoke and CO detectors starting at just $55, dramatically undercutting the premium segment. Matter/Thread support is arriving via Heiman and others, promising local-first, cloud-independent detection for the first time. [src1, src2, src4, src8]
The First Alert SC5 remains the top overall pick for Google Home users — Reviewed.com still lists it as their #1 — but reliability complaints have surfaced in 2026, including ~45-second push-notification latency, intermittent false alarms, and a CPSC incident report filed by a Deputy Fire Chief in February 2026 documenting complete unit failure. No official recall has been issued, but buyers should weigh this risk. For Alexa/Ring households, the Kidde Smart Smoke & CO with Ring ($55-$75 hardwired) delivers excellent value with real-time push notifications. For smart home enthusiasts running Home Assistant or Apple Home, the Heiman Matter smoke detector offers local Thread connectivity without cloud dependency. [src1, src2, src5, src6, src9]
Top 7 Models Compared
| Model | Price | Detection | Connectivity | Ecosystem | Power | Best For | Buy |
|---|---|---|---|---|---|---|---|
| First Alert SC5 (Battery) | ~$111-130 | Smoke + CO | Wi-Fi, Nest Weave | Google Home | CR123A batteries | Best overall (Google, with caveats) | Check price |
| First Alert SC5 (Hardwire) | ~$120-134 | Smoke + CO | Wi-Fi, Nest Weave | Google Home | 120V + backup | Best hardwired (Google) | Check price |
| Kidde Smart Smoke & CO with Ring | ~$55-75 | Smoke + CO | Wi-Fi | Alexa, Ring | Hardwired + AA | Best value (Alexa) | Check price |
| First Alert SMCO410 Z-Wave | ~$40-50 | Smoke + CO | Z-Wave Plus | Ring Alarm, SmartThings | 10-year battery | Best for Z-Wave hubs | Check price |
| Heiman Matter Smoke Detector | ~$35-45 | Smoke only | Matter/Thread | Apple Home, SmartThings, HA | CR123A (10-year) | Best for Matter/Thread | Check price |
| Gentex Place Any Space | ~$139 | Smoke + CO | Wi-Fi | Gentex app | Hardwired + backup | Best premium | — |
| X-Sense XS01-WT | ~$30-40 | Smoke only | Wi-Fi (2.4GHz) | Tuya/Smart Life | CR123A battery | Best budget Wi-Fi | Check price |
Best for Each Use Case
Best Overall (Google Home): First Alert SC5 (~$111-130) — Check price
The official successor to the Nest Protect, built in partnership with Google. Reviewed.com still ranks it as their #1 smart smoke/CO detector for 2026. Precision Detection Advanced Sensing technology detects both fast-flaming and smoldering fires while reducing cooking false alarms. Sends push alerts via Google Home app and triggers an 85dB alarm. Interconnects with existing Nest Protect units via Nest Weave mesh. Available in both battery and hardwired versions, now widely available below MSRP at Walmart ($111) and Best Buy ($134). Caveat: 2026 user reports note ~45-second notification latency and intermittent false alarms — see Important Caveats below. [src1, src2, src4, src9]
Best Value (Alexa/Ring): Kidde Smart Smoke & CO with Ring (~$55-75) — Check price
Announced at CES 2025 and shipping since April 2025, this Kidde-Ring collaboration delivers Wi-Fi smoke and CO detection at less than half the price of the SC5. Connects directly to home Wi-Fi without requiring a Ring Alarm hub. Push notifications through Ring app, voice alerts that identify the hazard type. Enhanced sensing technology reduces cooking false alarms. Optional Ring professional monitoring for $5/month adds emergency dispatcher contact. Hardwired with AA battery backup. Voice control via both Amazon Echo and Google Home. [src2, src5, src8]
Best for Z-Wave Smart Homes: First Alert SMCO410 (~$40-50) — Check price
The 2025 replacement for the popular ZCOMBO-G. Z-Wave Plus certified, works with Ring Alarm base station, SmartThings, Hubitat, and Home Assistant via Z-Wave. Detects both smoke and CO with a sealed 10-year lithium battery. No Wi-Fi required, which means no cloud dependency and no recurring fees. Reviewed.com's #2 pick for 2026 (works with Ring). Requires a Z-Wave hub for smart features — without a hub it functions as a standard detector. [src1, src2, src7]
Best for Matter/Thread: Heiman Matter Smoke Detector (~$35-45) — Check price
One of the first Matter-over-Thread smoke detectors on the market. UL 217 9th Edition certified. Works natively with Apple Home, SmartThings, and Home Assistant without cloud reliance — alerts are processed locally via Thread border routers. Photoelectric sensor specialized for slow-burning fires that produce smoke before flames. Single CR123A lithium battery rated up to 10 years. Mesh range up to 70 meters between devices. Smoke only — no CO detection. Requires a Thread border router (Apple TV 4K, HomePod Mini, or compatible hub). [src3]
Best Premium: Gentex Place Any Space (~$139)
From a commercial fire protection company with decades of industry experience. Reacted to smoke faster than any other detector tested per professional reviews. Features include ambient temperature/humidity sensing, motion detection, and customizable nightlight. Room-specific variants available: Kitchen ($250, adds VOC/gas detection), Nursery ($350, adds air quality monitor + camera + white noise), Garage ($300, heat sensing + camera). Wi-Fi connected via Gentex Place app. No ecosystem integration with Google/Alexa/Apple yet — standalone app only. [src6]
Best Budget Wi-Fi: X-Sense XS01-WT (~$30-40) — Check price
Compact 3.1-inch photoelectric smoke detector with direct Wi-Fi connection via Smart Life/Tuya app. Smartphone push notifications when smoke is detected. 85dB alarm. Smoke detection only — no CO sensor. CR123A battery lasts approximately 1 year with Wi-Fi active (vs 5 years without Wi-Fi). 2.4GHz Wi-Fi only. Good entry-level option for renters or supplemental coverage. Important: avoid the X-Sense SC07-MR variant — Reviewed.com flagged it as lacking UL certification. The SC07 and SC07-W variants are UL-certified. [src2, src3, src7]
Decision Logic
If user is in the Google Home ecosystem and reliability is critical
→ First Alert SC5 ($111-130), but verify firmware is current and consider redundancy with a hardwired Kidde or traditional UL-listed detector. SC5 is the only smart smoke/CO with native Google Home since Nest Protect ended, but 2026 reports note notification latency and false alarms. [src1, src4, src9]
If user is in the Alexa/Ring ecosystem
→ Kidde Smart Smoke & CO with Ring ($55-75) for best value. Or First Alert SMCO410 Z-Wave ($40-50) if user has a Ring Alarm base station and prefers no cloud dependency. [src2, src5, src8]
If user runs Home Assistant or Apple HomeKit
→ Heiman Matter smoke detector ($35-45) for local Thread-based alerts without cloud. Add separate CO detection if needed. For Z-Wave setups, First Alert SMCO410 works well with Home Assistant. [src3]
If budget < $50
→ First Alert SMCO410 Z-Wave ($40-50) for smoke + CO with Z-Wave hub, or X-Sense XS01-WT ($30-40) for basic Wi-Fi smoke alerts without a hub. [src3, src7]
If user wants premium whole-home system
→ Gentex Place system starting at $139/unit. Room-specific models add specialized sensors. Best detection speed in testing but no major ecosystem integration. Expensive at scale. [src6]
If user has documented hesitation about SC5 reliability complaints
→ Kidde Smart Smoke & CO with Ring ($75) for cross-ecosystem (Alexa + Google), or pair a non-smart UL-listed detector (Kidde i12060) with a Heiman Matter unit for redundancy. Consumer Reports' 2026 ratings include the Kidde Smart P4010DCSCO-W as a tested alternative. [src8, src9]
Default recommendation
→ First Alert SC5 ($111-130) for Google users (reliability caveats noted), Kidde Smart Smoke & CO with Ring ($55-75) for Alexa users. Both detect smoke and CO, send phone alerts, and require no subscription for core features. [src1, src2, src5]
Key Market Trends (2026)
- Nest Protect era ends, replacement scrutinized: Google discontinued the category-defining Nest Protect in March 2025. The First Alert SC5 became the official replacement, but by Q1 2026 had accumulated reliability complaints (notification latency ~45s, false alarms, a CPSC incident report from a Deputy Fire Chief documenting unit failure). No formal recall, but Google ecosystem users now face a tradeoff between integration and reliability. [src1, src4, src9]
- Amazon/Ring fully entered the market: The Kidde-Ring partnership now ships hardwired Wi-Fi smoke/CO at $55-$75 — significantly below the SC5 price point. Reviewed.com's 2026 list now ranks Kidde Ring as their #3 (formerly absent in 2025). [src2, src5]
- Matter/Thread adoption begins: Heiman's Matter smoke detector is among the first to ship, enabling local-first detection through Thread border routers (range up to 70m mesh). Most consumer brands (X-Sense, First Alert, Kidde) still don't support Matter as of April 2026. [src3]
- UL 217 10th Edition compliance gap widens: The standard (effective June 2024) requires detection of both fast-flaming and smoldering fires with reduced cooking false alarms. Newer models comply; older inventory still on shelves may not. [src1, src7, src8]
- Room-specific specialization: Gentex Place pioneered room-specific detector variants (Kitchen with VOC sensing, Nursery with camera, Garage with heat detection). No mainstream competitor has copied the approach in 2026. [src6]
- Professional monitoring becomes affordable: Ring offers $5/month monitoring that dispatches emergency services when smoke/CO is detected. This was previously a $20-$40/month feature. [src5]
- No 2026 smart smoke detector recalls (yet): Despite SC5 user complaints and a February 2026 CPSC incident report, no formal recall has been issued for current-generation smart smoke/CO detectors as of April 2026. Last major recall was Kidde TruSense (2021). [src9]
Important Caveats
- Prices are approximate US retail prices as of April 2026. Regional availability varies — Kidde Ring products initially launched exclusively at Home Depot.
- First Alert SC5 reliability complaints: 2026 user reports across The Home Depot, Best Buy, Google Nest Community, and a Farzan Law CPSC incident report describe ~45-second notification delays, recurring false alarms with no smoke present, and complete unit failures. No official recall as of April 2026, but buyers may want to verify the return policy and consider redundant non-smart UL-listed detectors. [src9]
- Smart features require a working internet connection. During power outages or internet failures, all models revert to local alarm-only operation.
- Smoke detectors have a 10-year lifespan per NFPA standards regardless of smart features. CO sensors have a 5-10 year lifespan.
- UL/ETL certification matters for safety and insurance compliance. The X-Sense SC07-MR (not recommended by Reviewed) lacked UL certification; the SC07 and SC07-W variants are UL-certified. Always verify certification before purchase. [src2]
- Interconnection between brands is limited. First Alert SC5 interconnects with Nest Protect via Nest Weave, but Kidde Ring detectors cannot interconnect with First Alert or vice versa.