# Set Theory Clock (BerlinClock) vs Clock Stamp

The clearest difference is rating: Clock Stamp at 5.0 against Set Theory Clock (BerlinClock)'s 3.7. Clock Stamp also leads on update cadence (every 2 days vs every 129 months). Set Theory Clock (BerlinClock)'s advantage is ratings volume (3 vs 1) and iOS requirement (17.6 vs 26.2). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Clock Stamp holds the better App Store score, 5.0 against 3.7. Both are backed by a comparable volume of ratings — 3 and 1 respectively.

Set Theory Clock (BerlinClock) ships an update every 129 months, Clock Stamp every 2 days. Both last shipped on October 29, 2026.

## The numbers

| Metric | Set Theory Clock (BerlinClock) | Clock Stamp |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.7 (3 ratings)](https://appshunter.io/ios/app/set-theory-clock-berlinclock/id972665637/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/clock-stamp/id6800348277/reviews)** |
| Number of ratings | **3** | 1 |
| Positive reviews | 16.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 129 months | **Every 2 days** |
| Monetization | Free | Free |
| Size | 2 MB | 4 MB |
| Requires iOS | **17.6** | 26.2 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Stefan Neumann](https://appshunter.io/developer/972665636) | [Zhicheng Chen](https://appshunter.io/developer/6800348339) |

## 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


### Clock Stamp

[App page](https://appshunter.io/ios/app/clock-stamp/id6800348277)

This app displays multiple city time zones on a single, elegant clock face. It provides visual context for day, night, and weather in each location, aiding in travel planning and international communication.

**Highlights:** Multiple city time zones, Visual analog world clock, Local time difference display, Weather and day/night context, 12-hour and 24-hour modes, Light and dark appearance

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

**In-app purchases:** none


## Frequently asked questions

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

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

### Is Clock Stamp free?

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

### Which has better reviews, Set Theory Clock (BerlinClock) or Clock Stamp?

Clock Stamp is rated higher. Set Theory Clock (BerlinClock) averages 3.7 out of 5 from 3 ratings, while Clock Stamp averages 5.0 from 1 ratings.

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

Neither Set Theory Clock (BerlinClock) nor Clock Stamp shows ads.

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

Set Theory Clock (BerlinClock) ships an update every 129 months, and Clock Stamp every 2 days. Most recently, Set Theory Clock (BerlinClock) was updated on October 29, 2026 and Clock Stamp on October 29, 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.*