# Kidde vs Sound Alert.

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.

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.

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.

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

## The numbers

| Metric | Kidde | Sound Alert. |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (6.7K ratings)](https://appshunter.io/ios/app/kidde/id942334464/reviews)** | [2.8 (6 ratings)](https://appshunter.io/ios/app/sound-alert/id1126014754/reviews) |
| Number of ratings | **6.7K** | 6 |
| Positive reviews | **44.5% of reviews** | 20.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Freemium | Free with in-app purchases |
| Size | 88 MB | 70 MB |
| Requires iOS | 14.0 | **9.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Walter Kidde Portable Equipment](https://appshunter.io/developer/942334463) | [Innovation Factory Limited](https://appshunter.io/developer/915950101) |

## What reviewers say

### Kidde

[App page](https://appshunter.io/ios/app/kidde/id942334464)

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:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Advanced Home Health - Monthly | $1.99 | per month |
| Advanced Home Health - Annual | $19.99 | per year |

**What reviewers like**

- 🚀 Easy setup
- 👍 Helpful app features
- 🔒 Provides peace of mind
- 💡 Useful air quality monitoring
- 👍 Good customer support

**What reviewers complain about**

- 🐛 Frequent false alarms
- 🐛 Connectivity issues
- 🐛 Buggy app and firmware
- 👎 Paywalled features
- 👎 Poor user experience

**Reported bugs**

- 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**

- 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.

[App page](https://appshunter.io/ios/app/sound-alert/id1126014754)

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:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sound Alert Full version | $35.99 | one-time |


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*