# Kidde vs Sub

The clearest difference is in-app purchases: Sub at none against Kidde's 2. Kidde's advantage is review sentiment (44% vs 15%) and rating (4.7 vs 4.4). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Kidde sells 2 in-app purchases, starting at $1.99 per month. Sub asks for nothing beyond the download.

Kidde holds the better App Store score, 4.7 against 4.4. That said, the two scores are not equally well evidenced: Kidde has 6.7K ratings behind it against 778, 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 15% of Sub's.

Kidde ships an update every 2 months, Sub every 5 weeks. Both last shipped on October 15, 2026.

## The numbers

| Metric | Kidde | Sub |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (6.7K ratings)](https://appshunter.io/ios/app/kidde/id942334464/reviews)** | [4.4 (778 ratings)](https://appshunter.io/ios/app/sub-zero-group-owners-app/id1248991284/reviews) |
| Number of ratings | **6.7K** | 778 |
| Positive reviews | **44.5% of reviews** | 15.1% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 weeks** |
| Monetization | Freemium | **Ad-supported** |
| Size | 88 MB | 69 MB |
| Requires iOS | **14.0** | 15.5 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Walter Kidde Portable Equipment](https://appshunter.io/developer/942334463) | [Sub-Zero and Wolf](https://appshunter.io/developer/983988992) |

## 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


### Sub

[App page](https://appshunter.io/ios/app/sub-zero-group-owners-app/id1248991284)

This app enhances your kitchen experience by guiding you through recipes from websites and a curated collection. It allows remote control and monitoring of Sub-Zero refrigeration, Cove dishwashing, and Wolf appliances, ensuring optimal performance and convenience.

**Highlights:** Guided cooking from online recipes, Chef-tested recipes optimized for Wolf appliances, Remote dishwasher control and monitoring, Refrigerator settings and alerts, Filter recipes by cooking mode, Bookmark and share recipes

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🚀 Responsive and intuitive app
- 👍 Helpful notifications and alerts
- 🔒 Secure connection to appliances

**What reviewers complain about**

- 🐛 Frequent connection issues and disconnects
- 🔍 Lack of actual temperature monitoring
- 🤔 Confusing setup and pairing process
- 🔍 Missing key features like remote start

**Reported bugs**

- App crashes after recent updates
- Unable to log in or register account
- Appliances disappear from the app
- Firmware update failures brick appliances

**Requested features**

- Add support for Celsius temperature units
- Provide real-time temperature and energy consumption data
- Integrate with smart home platforms like Apple HomeKit


## Frequently asked questions

### Is Kidde free?

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

### Is Sub free?

Sub is free to download, with no in-app purchases.

### Which has better reviews, Kidde or Sub?

Kidde is rated higher. Kidde averages 4.7 out of 5 from 6.7K ratings, while Sub averages 4.4 from 778 ratings.

### Do Kidde or Sub have ads?

Neither Kidde nor Sub shows ads.

### Which is updated more often, Kidde or Sub?

Kidde ships an update every 2 months, and Sub every 5 weeks. Most recently, Kidde was updated on October 15, 2026 and Sub on October 15, 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.*