# CDOUBLES vs aipetrix

The clearest difference is update cadence: aipetrix at fortnightly against CDOUBLES's every 4 months. CDOUBLES's advantage is iOS requirement (7.0 vs 14.0). 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, aipetrix fortnightly. The most recent releases landed on October 7, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | CDOUBLES | aipetrix |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Fortnightly** |
| Size | 32 MB | 137 MB |
| Requires iOS | **7.0** | 14.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [CHUNG YI HUNG](https://appshunter.io/developer/1106401998) | [SanKeXiaoCao(ShenZhen)IOT Technology Company Limited](https://appshunter.io/developer/1550220407) |

## What reviewers say

### CDOUBLES

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

**Features:** macOS Compatibility

**In-app purchases:** none


### aipetrix

[App page](https://appshunter.io/ios/app/aipetrix/id6772852904)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is CDOUBLES free?

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

### Is aipetrix free?

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

### Do CDOUBLES or aipetrix have ads?

Neither CDOUBLES nor aipetrix shows ads.

### Which is updated more often, CDOUBLES or aipetrix?

CDOUBLES ships an update every 4 months, and aipetrix fortnightly. Most recently, CDOUBLES was updated on October 7, 2026 and aipetrix on October 2, 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.*