# Set Theory Clock (BerlinClock) vs Strange Clocks

The clearest difference is in-app purchases: Set Theory Clock (BerlinClock) at none against Strange Clocks's 1. Strange Clocks's advantage is update cadence (every 3 days vs every 129 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Strange Clocks sells 1 one-off in-app purchase. Set Theory Clock (BerlinClock) asks for nothing beyond the download.

Set Theory Clock (BerlinClock) ships an update every 129 months, Strange Clocks every 3 days. The most recent releases landed on October 10, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Set Theory Clock (BerlinClock) | Strange Clocks |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/set-theory-clock-berlinclock/id972665637/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 16.7% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 129 months | **Every 3 days** |
| Monetization | Free | — |
| Size | 2 MB | 9 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Stefan Neumann](https://appshunter.io/developer/972665636) | [KIP Networks](https://appshunter.io/developer/1886007012) |

## What reviewers say

### Set Theory Clock (BerlinClock)

[App page](https://appshunter.io/ios/app/set-theory-clock-berlinclock/id972665637)

This app displays time using the unique Berlin Clock system, featuring 24 lamps arranged in four rows to represent hours and minutes. It offers a visually distinct way to tell time, with lamps lighting up sequentially to indicate the passing of time.

**Highlights:** 24-lamp display, Hour representation (5-hour and 1-hour lamps), Minute representation (5-minute and 1-minute lamps), Sequential lamp lighting, Unique time visualization

**Features:** macOS Compatibility

**In-app purchases:** none


### Strange Clocks

[App page](https://appshunter.io/ios/app/strange-clocks/id6814674635)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock all 15 clocks | $1.99 | one-time |


## Frequently asked questions

### Is Set Theory Clock (BerlinClock) free?

Set Theory Clock (BerlinClock) is free to download, with no in-app purchases.

### Is Strange Clocks free?

Strange Clocks is free to download, with in-app purchases available.

### Do Set Theory Clock (BerlinClock) or Strange Clocks have ads?

Neither Set Theory Clock (BerlinClock) nor Strange Clocks shows ads.

### Which is updated more often, Set Theory Clock (BerlinClock) or Strange Clocks?

Set Theory Clock (BerlinClock) ships an update every 129 months, and Strange Clocks every 3 days. Most recently, Set Theory Clock (BerlinClock) was updated on October 10, 2026 and Strange Clocks on October 16, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*