# Set Theory Clock (BerlinClock) vs EarthTime

The clearest difference is review sentiment: EarthTime at 100% against Set Theory Clock (BerlinClock)'s 17%. EarthTime also leads on update cadence (every 23 months vs every 129 months) and device support (3 vs 1). 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.

Set Theory Clock (BerlinClock) ships an update every 129 months, EarthTime every 23 months. Both last shipped on October 3, 2026.

## The numbers

| Metric | Set Theory Clock (BerlinClock) | EarthTime |
| --- | --- | --- |
| 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 | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 129 months | **Every 23 months** |
| Monetization | Free | Free |
| Size | 2 MB | 15 MB |
| Requires iOS | 17.6 | **11.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Stefan Neumann](https://appshunter.io/developer/972665636) | [DaliFermat Ltd](https://appshunter.io/developer/1131359876) |

## 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


### EarthTime

[App page](https://appshunter.io/ios/app/earthtime/id1131359877)

This app presents a universal time system based on Earth's orbit and rotation, independent of cultural constructs like months or hours. It features a unique clock display, a converter for local time, and a timer, offering a consistent global date-time.

**Highlights:** Universal date-time system, Concentric dial clock display, Local Gregorian date-time option, EarthTime to local time converter, EarthTime timer

**Features:** macOS Compatibility

**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 EarthTime free?

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

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

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

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

Set Theory Clock (BerlinClock) ships an update every 129 months, and EarthTime every 23 months. Most recently, Set Theory Clock (BerlinClock) was updated on October 3, 2026 and EarthTime on October 3, 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.*