# 레트로 시계 vs Flip Clock

The clearest difference is in-app purchases: 레트로 시계 at none against Flip Clock's 1. 레트로 시계 also leads on update cadence (fortnightly vs monthly) and iOS requirement (13.0 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. Flip Clock sells 1 one-off in-app purchase. 레트로 시계 asks for nothing beyond the download.

레트로 시계 ships an update fortnightly, Flip Clock monthly. Both last shipped on October 16, 2026.

## The numbers

| Metric | 레트로 시계 | Flip Clock |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Monthly |
| Size | 15 MB | 3 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [YOUNGJOO KIM](https://appshunter.io/developer/1851492729) | [磊 刘](https://appshunter.io/developer/1892400556) |

## What reviewers say

### 레트로 시계

[App page](https://appshunter.io/ios/app/id6760407197)

**Features:** macOS Compatibility

**In-app purchases:** none


### Flip Clock

[App page](https://appshunter.io/ios/app/flip-clock-timer-and-focus/id6767742797)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SimpleClock Pro Edition | $2.99 | one-time |


## Frequently asked questions

### Is 레트로 시계 free?

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

### Is Flip Clock free?

Flip Clock is free to download, with in-app purchases available.

### Do 레트로 시계 or Flip Clock have ads?

Neither 레트로 시계 nor Flip Clock shows ads.

### Which is updated more often, 레트로 시계 or Flip Clock?

레트로 시계 ships an update fortnightly, and Flip Clock monthly. Most recently, 레트로 시계 was updated on October 16, 2026 and Flip Clock on October 16, 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.*