Comparison

Kidde vs Sound Alert.

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Kidde

This app connects to smart home safety devices, providing real-time alerts for smoke, CO, air quality, and water leaks. It offers features like Smart Hush, remote notifications to loved ones, and advanced indoor air quality monitoring through a subscription service.

Highlights
  • Real-time alarm notifications
  • Smart Hush functionality
  • QR code setup for Wi-Fi connection
  • Device replacement notifications
  • Remote notifications to friends/family
  • Advanced Indoor Air Quality (IAQ) monitoring
  • Mold Risk Analysis
Features
Read full description

Step into the future with Kidde Smart Home Safety – where the intelligence of modern homes meets cutting-edge protection. The Kidde app seamlessly integrates with your smart home safety devices, delivering real-time alerts, Smart Hush® functionality, and more, all at your fingertips. Explore the Tech-Savvy Features: - Receive instant alarm notifications for smoke, carbon monoxide, indoor air quality issues, or water leaks. - Effortlessly set up alarms by scanning the QR code on the product, connected to your home Wi-Fi 2.4GHz network. - Easily test your alarm's functionality when you are at home. - Stay informed with notifications for device replacements. - Notify friends and family if hazards are detected when you're away. Unlock Advanced Home Health - Elevate Your IAQ Experience: Introducing Advanced Home Health, an exclusive indoor air quality subscription that seamlessly integrates premium features into your IAQ devices. Immerse yourself in the futuristic experience of our revamped IAQ dashboard, featuring a sleek design and a cutting-edge interface designed for tech-savvy subscribers. Subscription perks include: - Advanced Mold Risk Analysis - Thermal Comfort readings - Weekly air quality reports covering temperature, humidity, TVOC, Mold Risk, and Thermal Comfort. - Enjoy a 10% discount on ShopKidde.com. Discover Smart Devices: - Smoke + Carbon Monoxide Alarm with smart features – Double the detection for enhanced safety. - Smoke + Carbon Monoxide Alarm with Indoor Air Quality Monitor – An industry first, combining smoke and CO detection with IAQ monitoring. - Carbon Monoxide Alarm with Indoor Air Quality Monitor – Easy plug-in operation for reliable detection. - Water Leak + Freeze Detector – Early detection to prevent damage. - RemoteLync Camera (Sunsetting on January 7, 2024) – A cordless, Wi-Fi-enabled security camera capturing clips and providing alerts. Embrace the future of home safety with Kidde Smart Home Protection – where technology meets peace of mind. Terms of Use: https://help.kidde.com/hc/en/6-kidde/faq/589-terms-of-service/?l=en

About

Sound Alert.

This app uses your smartphone's microphone to detect important environmental sounds like alarms and doorbells. It alerts users through vibrations, camera flash, and on-screen notifications, offering peace of mind for those who are hard-of-hearing or heavy sleepers.

Highlights
  • Records and detects environmental sounds
  • Alerts for doorbells, smoke alarms, and more
  • Vibrates smartphone and connected watches
  • Flashes mobile camera light for alerts
  • Displays event icons and text notifications
  • Connects with Pebble Watch
Features
Read full description

Sound Alert App gives you the ability to record your environmental and home sounds to alert you in case of events which are important for you like doorbells, Telephone Ringing, Microwave beeping, Thief Alarm and Intercom. The app able to detect any type of Smoke alarms without the need to record them, pre-installed any type of smoke alarms. Unlike other solutions with flashing lights and expensive hardware installations, Sound Alert allows you to use the current building infrastructure and alarm systems installed and still be alerted to events even if you are unable to hear or see them. This can give you a sense of security and peace of mind. Sound Alert App is efficient when it comes to quick response, alert time, and is also very affordable . It's perfect for people who are hard-of-hearing, deaf, elderly, and Heavy Sleepers too. The app uses your smartphone's microphone to constantly listen to your environment when you activate "Detection Mode". Sound Alert can be connected to Pebble Watch, This easy-to-use app enables a fast way to be notified of all situations. The unique Sound Alert platform is able to detect a broad range of sounds with it's smart algorithm and alerts the user by vibrating their smartphone and Pebble watch, flashing your mobile’s camera light, and showing an icon image of the current event on your smartphone and Pebble watch's screen with a text note of the name of the event under the icon. Continued use of GPS running in the background can dramatically decrease battery life. We hope you enjoy your experience using this great new technology and appreciate your feedback so we can constantly improve. Below video link how to use Sound Alert App : https://www.youtube.com/watch?v=D5aIVD2mPlU

Screenshots

Kidde4 screens
Sound Alert.3 screens

Verdict

The call

The clearest difference is rating: Kidde at 4.7 against Sound Alert.'s 2.8. Kidde also leads on ratings volume (6.7K vs 6) and review sentiment (44% vs 20%). Sound Alert.'s advantage is iOS requirement (9.0 vs 14.0). On price, update cadence, ads and in-app purchases there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Kidde sells 2 in-app purchases, starting at $1.99 per month and Sound Alert. sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Kidde holds the better App Store score, 4.7 against 2.8. That said, the two scores are not equally well evidenced: Kidde has 6.7K ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 44% of Kidde's written reviews are positive against 20% of Sound Alert.'s.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 15, 2026 and October 3, 2026 respectively.

Scorecard4 real differences · 6 level
Kidde versus Sound Alert.: the parameters behind the verdict, then further details
ParameterKiddeSound Alert.
PriceFreeFree
Rating4.7 (6.7K ratings) — better2.8 (6 ratings)
Positive reviews44.5% of reviews — better20.0% of reviews
Number of ratings6.7K — better6
Update frequencyEvery 2 monthsEvery 2 months
AdsNoNo
In-app purchasesYesYes
MonetizationFreemiumFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS14.09.0 — better
Further details — not scored
Size88 MB70 MB
Age rating4+4+
DeveloperWalter Kidde Portable EquipmentInnovation Factory Limited

Customer experience

Kidde

All ratings6,671 ratings
Positive95.1%
Neutral1.7%
Negative3.1%
Written reviews218 reviews
Positive44.5%
Neutral8.7%
Negative46.8%

Sound Alert.

All ratings6 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews5 reviews
Positive20.0%
Neutral20.0%
Negative60.0%

Bugs and requests

Kidde

Reported bugs

5 issues
  • App unable to connect to devices
  • Firmware updates failing
  • Devices going offline randomly
  • Notifications not working as expected
  • Inconsistent device naming in app

Requested features

5 requests
  • Add HomeKit support
  • Improve historical data tracking
  • Provide more detailed temperature/air quality data
  • Allow remote alarm silencing
  • Enhance app stability and usability

Sound Alert.

Not enough reviews yet to summarise bugs or requests.

In-app purchases

2 purchases

Kidde

Subscriptions2
  • Advanced Home Health - Monthly1 Month trial$1.991 Month
  • Advanced Home Health - Annual1 Month trial$19.991 Year
1 purchases

Sound Alert.

One-time1
  • Sound Alert Full version$35.99

Questions

Is Kidde free?
Kidde is free to download, with in-app purchases available.
Is Sound Alert. free?
Sound Alert. is free to download, with in-app purchases available.
Which has better reviews, Kidde or Sound Alert.?
Kidde is rated higher. Kidde averages 4.7 out of 5 from 6.7K ratings, while Sound Alert. averages 2.8 from 6 ratings.
Do Kidde or Sound Alert. have ads?
Neither Kidde nor Sound Alert. shows ads.
Which is updated more often, Kidde or Sound Alert.?
Kidde ships an update every 2 months, and Sound Alert. every 2 months. Most recently, Kidde was updated on October 15, 2026 and Sound Alert. on October 3, 2026.

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