# D vs Pai.ACT

The clearest difference is update cadence: Pai.ACT at every 4 weeks against D's every 27 months. Pai.ACT also leads on iOS requirement (11.0 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.

D ships an update every 27 months, Pai.ACT every 4 weeks. The most recent releases landed on September 9, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | D | Pai.ACT |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 27 months | **Every 4 weeks** |
| Size | 14 MB | 185 MB |
| Requires iOS | 14.0 | **11.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Yun Kwok Wing](https://appshunter.io/developer/1603030553) | [The Chinese University of Hong Kong](https://appshunter.io/developer/369070876) |

## What reviewers say

### D

[App page](https://appshunter.io/ios/app/d-momo/id1617990805)

**Features:** macOS Compatibility

**In-app purchases:** none


### Pai.ACT

[App page](https://appshunter.io/ios/app/paiact/id6462592721)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is D free?

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

### Is Pai.ACT free?

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

### Do D or Pai.ACT have ads?

Neither D nor Pai.ACT shows ads.

### Which is updated more often, D or Pai.ACT?

D ships an update every 27 months, and Pai.ACT every 4 weeks. Most recently, D was updated on September 9, 2026 and Pai.ACT on September 20, 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.*