Set Theory Clock (BerlinClock) vs EarthTime
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Set Theory Clock (BerlinClock)
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.
- 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
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The Berlin Clock consists of 24 lamps arranged in 4 rows. The top two rows (red) represent the hours, and the bottom two rows (yellow) represent the minutes. Additionally, a circular yellow lamp at the top flashes every 2 seconds. In the top rows of each color, each lamp represents 5 hours or 5 minutes, respectively, while in the bottom rows, each represents 1 hour or 1 minute. The lamps light up from left to right and from bottom to top. Once a row is full, all lamps turn off and another lamp lights up in the row above it.
EarthTime
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.
- Universal date-time system
- Concentric dial clock display
- Local Gregorian date-time option
- EarthTime to local time converter
- EarthTime timer
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EarthTime is a global date-time system which is truly international and independent of culture. It is based on the 2 given parameters of time passing on Earth; • The Earth Year - an orbit around the Sun; • The Earth Day - a revolution around Earth's axis. The counting of the Earth years in the current era begins around the time of the first signs of human civilisation. Each year starts on the northern/southern hemisphere's spring/autumn equinox. Each day is divided into decimal fractions to express the time of day. There are no time zones, so it is always the same date-time everywhere on Earth. The EarthTime day starts and ends at midnight GMT. There are no months, weeks, hours, minutes, seconds, as these are simply human constructions which vary between cultures. Thus, the EarthTime at 2 Aug 2016 12:11am BST (when the system was first revealed to the world in the form of an App) was: 11,769 : 134.46635 The ingenious App displays the EarthTime in an innovative clock of concentric dials with an option to display local gregorian date-time. It has a calculator to convert between local and EarthTime and a timer in EarthTime. EarthTime, the most original app in years
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Set Theory Clock (BerlinClock) | EarthTime |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (2 ratings) — better | — |
| Positive reviews | 16.7% of reviews | 100.0% of reviews — better |
| Number of ratings | 2 — better | — |
| Update frequency | Every 129 months | Every 23 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 17.6 | 11.0 — better |
| Further details — not scored | ||
| Size | 2 MB | 15 MB |
| Age rating | 4+ | 4+ |
| Developer | Stefan Neumann | DaliFermat Ltd |
Customer experience
Set Theory Clock (BerlinClock)
EarthTime
In-app purchases
Set Theory Clock (BerlinClock)
No in-app purchases
EarthTime
No in-app purchases
Questions
Is Set Theory Clock (BerlinClock) free?
Is EarthTime free?
Do Set Theory Clock (BerlinClock) or EarthTime have ads?
Which is updated more often, Set Theory Clock (BerlinClock) or EarthTime?
Other comparisons
