Set Theory Clock (BerlinClock) vs eTCH Sync Time
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.
eTCH Sync Time
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eTCH is a new way to show the clock time...it's hard to explain, it's better to see it in action!
Screenshots
Verdict
The clearest difference is update cadence: eTCH Sync Time at monthly against Set Theory Clock (BerlinClock)'s every 129 months. eTCH Sync Time also leads on device support (3 vs 1) and iOS requirement (9.3 vs 17.6). On price, ads and in-app purchases 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, eTCH Sync Time monthly. Both last shipped on September 9, 2026.
| Parameter | Set Theory Clock (BerlinClock) | eTCH Sync Time |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (2 ratings) — better | — |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 129 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 17.6 | 9.3 — better |
| Further details — not scored | ||
| Size | 2 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Stefan Neumann | GCtronic Sagl |
In-app purchases
Set Theory Clock (BerlinClock)
No in-app purchases
eTCH Sync Time
No in-app purchases
Questions
Is Set Theory Clock (BerlinClock) free?
Is eTCH Sync Time free?
Do Set Theory Clock (BerlinClock) or eTCH Sync Time have ads?
Which is updated more often, Set Theory Clock (BerlinClock) or eTCH Sync Time?
Other comparisons
