# Kidde vs Time Zone Shifter

The clearest difference is rating: Kidde at 4.7 against Time Zone Shifter's 3.7. Kidde also leads on ratings volume (6.7K vs 9) and review sentiment (44% vs 20%). Time Zone Shifter's advantage is update cadence (monthly vs every 2 months). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Kidde sells 2 in-app purchases, starting at $1.99 per month and Time Zone Shifter 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 3.7. That said, the two scores are not equally well evidenced: Kidde has 6.7K ratings behind it against 9, 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 Time Zone Shifter's.

Kidde ships an update every 2 months, Time Zone Shifter monthly. The most recent releases landed on October 15, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | Kidde | Time Zone Shifter |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (6.7K ratings)](https://appshunter.io/ios/app/kidde/id942334464/reviews)** | [3.7 (9 ratings)](https://appshunter.io/ios/app/time-zone-shifter/id1484958175/reviews) |
| Number of ratings | **6.7K** | 9 |
| Positive reviews | **44.5% of reviews** | 20.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | Freemium | Free with in-app purchases |
| Size | 88 MB | 21 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Walter Kidde Portable Equipment](https://appshunter.io/developer/942334463) | [Wintermute Agency ApS](https://appshunter.io/developer/1462200375) |

## 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


### Time Zone Shifter

[App page](https://appshunter.io/ios/app/time-zone-shifter/id1484958175)

Easily convert and calculate local times across multiple time zones with intuitive gestures. View real day/night visualizations, sunrise/sunset times, and create reminders or calendar events for any time zone. Stay connected with friends and family abroad and make travel more enjoyable.

**Highlights:** Day and night visualizations, Sunrise and sunset information, Time zone and hour difference calculation, Create Reminders and Calendar events, Geo-based location support, Offline mode, Widgets for iPhone and iPad

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |


## Frequently asked questions

### Is Kidde free?

Kidde is free to download, with in-app purchases available.

### Is Time Zone Shifter free?

Time Zone Shifter is free to download, with in-app purchases available.

### Which has better reviews, Kidde or Time Zone Shifter?

Kidde is rated higher. Kidde averages 4.7 out of 5 from 6.7K ratings, while Time Zone Shifter averages 3.7 from 9 ratings.

### Do Kidde or Time Zone Shifter have ads?

Neither Kidde nor Time Zone Shifter shows ads.

### Which is updated more often, Kidde or Time Zone Shifter?

Kidde ships an update every 2 months, and Time Zone Shifter monthly. Most recently, Kidde was updated on October 15, 2026 and Time Zone Shifter on September 27, 2026.

---

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