# CDOUBLES vs MerryIoT Sensor

The clearest difference is iOS requirement: CDOUBLES at 7.0 against MerryIoT Sensor's 13.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

CDOUBLES ships an update every 4 months, MerryIoT Sensor every 5 months. The most recent releases landed on September 6, 2026 and June 1, 2026 respectively.

## The numbers

| Metric | CDOUBLES | MerryIoT Sensor |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[1.0 (2 ratings)](https://appshunter.io/ios/app/merryiot-sensor/id1614807356/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 5 months |
| Monetization | — | Free |
| Size | 32 MB | 33 MB |
| Requires iOS | **7.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [CHUNG YI HUNG](https://appshunter.io/developer/1106401998) | [BROWAN COMMUNICATIONS INCORPORATION](https://appshunter.io/developer/1584963490) |

## What reviewers say

### CDOUBLES

[App page](https://appshunter.io/ios/app/cdoubles/id1106401999)

**Features:** macOS Compatibility

**In-app purchases:** none


### MerryIoT Sensor

[App page](https://appshunter.io/ios/app/merryiot-sensor/id1614807356)

Monitor your home's environment with this app. It tracks air quality, detects water leaks, and alerts you to unexpected movement, helping ensure a healthy and safe living space.

**Highlights:** Air quality monitoring, Water leak detection, Movement detection, Home safety alerts, Healthy home environment

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CDOUBLES free?

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

### Is MerryIoT Sensor free?

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

### Do CDOUBLES or MerryIoT Sensor have ads?

Neither CDOUBLES nor MerryIoT Sensor shows ads.

### Which is updated more often, CDOUBLES or MerryIoT Sensor?

CDOUBLES ships an update every 4 months, and MerryIoT Sensor every 5 months. Most recently, CDOUBLES was updated on September 6, 2026 and MerryIoT Sensor on June 1, 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.*