Comparison

Kasa Smart 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

Kasa Smart

Control and manage your TP-LINK smart home devices from anywhere. Schedule appliances, set custom modes, and monitor your devices remotely. Offers cloud storage for security camera footage.

Highlights
  • Remote device control
  • Scheduling and automation
  • Away Mode for security
  • Cloud storage for cameras
  • Device configuration
  • Real-time monitoring
Features
Read full description

Kasa Smart is your portal to your TP-LINK Smart Home. ** Kasa Smart is currently only compatible with TP-LINK Smart Plug HS100/110/107 KP200/400/401/405, EP40/40A/40M, Smart Plug Mini HS103/105, KP105/115, Smart Switch HS200/210/220, KS200/KS220/KS220M/KS225/KS230, Smart Power Strip HS300/303, Smart Bulb LB100/110/120/130/200/230, KL50/60/110/120/125/130, Smart Light Strip KL400/420/430, IP Camera KC100/105/110/115/120/200/300/310/400/401/410S/411S, EC60/70/71, Smart Router SR20, and Range Extender RE270/370/350K ** Kasa Smart lets you add, configure, monitor, and control your connected TP-LINK Smart Home devices from anywhere in the world. You can schedule your appliances to turn on or off according to your schedule, or set them to Away Mode to deter would-be burglars. And that’s just the beginning. Purchase a TP-LINK Smart Home device and download the app to get started today. Stay tuned for updates to the Kasa platform as we add support for new features and upcoming hardware in the Kasa family! Upgrade to Kasa Care cloud service (available for Security Cameras) · Enjoy 30-day unlimited video cloud storage and view videos anywhere, anytime. · Get instant notifications featuring a snapshot of the detected activity, · Record videos and post video clips to your preferred social media platform. Note: If you subscribe via Apple, payment will be charged to App Store Account at confirmation of purchase. Subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period. Account will be charged for renewal within 24 hours prior to the end of the current period at the rate of the selected plan. Subscriptions and auto-renewal may be managed by going to Account Settings after purchase. Monthly price per device: $2.99 USD (US) / €2.99 EUR (IE, DE, ES, PT, FI) / kr 30.00 SEK (SE) / $3.49 CAD (CA) / $4.49 AUD (AU) / £2.79 GBP (UK) / ¥350.00 JPY (JP) Terms of Service: https://privacy.tp-link.com/app/kasa/tou Privacy Policy: https://privacy.tp-link.com/app/Kasa/privacy

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

Kasa Smart4 screens
Sound Alert.3 screens

Verdict

The call

The clearest difference is review sentiment: Kasa Smart at 82% against Sound Alert.'s 20%. Kasa Smart also leads on rating (4.8 vs 2.8) and ratings volume (81K vs 6). Sound Alert.'s advantage is iOS requirement (9.0 vs 13.0). On price, ads, in-app purchases and monetization model 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. Kasa Smart sells 8 in-app purchases, starting at $2.99 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

Kasa Smart holds the better App Store score, 4.8 against 2.8. That said, the two scores are not equally well evidenced: Kasa Smart has 81K ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 82% of Kasa Smart's written reviews are positive against 20% of Sound Alert.'s.

UpkeepUpdate frequency

Kasa Smart ships an update every 3 weeks, Sound Alert. every 2 months. The most recent releases landed on November 2, 2026 and October 24, 2026 respectively.

Scorecard6 real differences · 5 level
Kasa Smart versus Sound Alert.: the parameters behind the verdict, then further details
ParameterKasa SmartSound Alert.
PriceFreeFree
Rating4.8 (81K ratings) — better2.8 (6 ratings)
Positive reviews81.7% of reviews — better20.0% of reviews
Number of ratings81K — better6
Update frequencyEvery 3 weeks — betterEvery 2 months
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
Best chart rank#34 — better—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.09.0 — better
Further details — not scored
Size617 MB70 MB
Age rating4+4+
DeveloperTP-Link Systems Inc.Innovation Factory Limited

Customer experience

Kasa Smart

All ratings80,782 ratings
Positive95.3%
Neutral0.9%
Negative3.8%
Written reviews3,197 reviews
Positive81.7%
Neutral3.4%
Negative14.9%

Sound Alert.

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

Bugs and requests

Kasa Smart

Reported bugs

4 issues
  • App getting stuck on terms of service page
  • Devices disappearing from the app
  • Schedules and automations not working as expected
  • Inconsistent time and location settings

Requested features

5 requests
  • More flexible scheduling options (e.g. random on/off, sunrise/sunset offsets)
  • Ability to share access and control with multiple users
  • Improved energy monitoring and reporting
  • Expanded compatibility with more smart home devices
  • Easier device organization and grouping

Sound Alert.

Not enough reviews yet to summarise bugs or requests.

In-app purchases

8 purchases

Kasa Smart

Subscriptions8
  • Kasa Care Plus 1 Cam/month1 Month trial$2.991 Month
  • Kasa Care Plus 2 Cam/month1 Month trial$5.991 Month
  • Kasa Care Plus 3 Cam/month1 Month trial$8.991 Month
Show 5 more
  • Kasa Care Premium 10 Cam/month1 Month trial$9.991 Month
  • Kasa Care Plus 1 Cam/year1 Month trial$29.991 Year
  • Kasa Care Plus 2 Cam/year1 Month trial$59.991 Year
  • Kasa Care Plus 3 Cam/year1 Month trial$89.991 Year
  • Kasa Care Premium 10 Cam/year1 Month trial$99.991 Year
1 purchases

Sound Alert.

One-time1
  • Sound Alert Full version$35.99

Questions

Is Kasa Smart free?
Kasa Smart 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, Kasa Smart or Sound Alert.?
Kasa Smart is rated higher. Kasa Smart averages 4.8 out of 5 from 81K ratings, while Sound Alert. averages 2.8 from 6 ratings.
Do Kasa Smart or Sound Alert. have ads?
Neither Kasa Smart nor Sound Alert. shows ads.
Which is updated more often, Kasa Smart or Sound Alert.?
Kasa Smart ships an update every 3 weeks, and Sound Alert. every 2 months. Most recently, Kasa Smart was updated on November 2, 2026 and Sound Alert. on October 24, 2026.

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