# Flat vs Sổ Sách HKD

The clearest difference is update cadence: Sổ Sách HKD at every 2 weeks against Flat's every 3 months. 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.

Flat ships an update every 3 months, Sổ Sách HKD every 2 weeks. The most recent releases landed on September 23, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Flat | Sổ Sách HKD |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Size | 16 MB | 35 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [GOLDSTAR TECHNOLOGY JOINT STOCK COMPANY](https://appshunter.io/developer/1794362789) | [Hai Nghiem](https://appshunter.io/developer/1875754170) |

## What reviewers say

### Flat

[App page](https://appshunter.io/ios/app/flat/id6758000407)

**Features:** macOS Compatibility

**In-app purchases:** none


### Sổ Sách HKD

[App page](https://appshunter.io/ios/app/so-sach-hkd/id6758919195)

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

**In-app purchases:** none


## Frequently asked questions

### Is Flat free?

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

### Is Sổ Sách HKD free?

Sổ Sách HKD is free to download, with no in-app purchases.

### Do Flat or Sổ Sách HKD have ads?

Neither Flat nor Sổ Sách HKD shows ads.

### Which is updated more often, Flat or Sổ Sách HKD?

Flat ships an update every 3 months, and Sổ Sách HKD every 2 weeks. Most recently, Flat was updated on September 23, 2026 and Sổ Sách HKD 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.*