# CDOUBLES vs MerryIoT for Amazon Sidewalk

The clearest difference is update cadence: MerryIoT for Amazon Sidewalk at every 3 weeks against CDOUBLES's every 4 months. CDOUBLES's advantage is iOS requirement (7.0 vs 13.0). On price, ads, in-app purchases and device support 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 for Amazon Sidewalk every 3 weeks. The most recent releases landed on September 6, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | CDOUBLES | MerryIoT for Amazon Sidewalk |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 weeks** |
| Size | 32 MB | 34 MB |
| Requires iOS | **7.0** | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, 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 for Amazon Sidewalk

[App page](https://appshunter.io/ios/app/merryiot-for-amazon-sidewalk/id6450383664)

**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 for Amazon Sidewalk free?

MerryIoT for Amazon Sidewalk is free to download, with no in-app purchases.

### Do CDOUBLES or MerryIoT for Amazon Sidewalk have ads?

Neither CDOUBLES nor MerryIoT for Amazon Sidewalk shows ads.

### Which is updated more often, CDOUBLES or MerryIoT for Amazon Sidewalk?

CDOUBLES ships an update every 4 months, and MerryIoT for Amazon Sidewalk every 3 weeks. Most recently, CDOUBLES was updated on September 6, 2026 and MerryIoT for Amazon Sidewalk on September 8, 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.*