# Set Theory Clock (BerlinClock) vs Fluid Time

The clearest difference is rating: Fluid Time at 5.0 against Set Theory Clock (BerlinClock)'s 3.0. Fluid Time also leads on update cadence (daily vs every 129 months) and iOS requirement (15.0 vs 17.6). Set Theory Clock (BerlinClock)'s advantage is in-app purchases (none vs 1). On price, ratings volume, ads and monetization model there is nothing between them.

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

Fluid Time holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

Set Theory Clock (BerlinClock) ships an update every 129 months, Fluid Time daily. The most recent releases landed on September 9, 2026 and June 1, 2026 respectively.

## The numbers

| Metric | Set Theory Clock (BerlinClock) | Fluid Time |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (2 ratings)](https://appshunter.io/ios/app/set-theory-clock-berlinclock/id972665637/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/fluid-time-see-time-flow/id6670695819/reviews)** |
| Number of ratings | **2** | 1 |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 129 months | **Daily** |
| Monetization | Free | Free |
| Size | 2 MB | 40 MB |
| Requires iOS | 17.6 | **15.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Stefan Neumann](https://appshunter.io/developer/972665636) | [Guangzhou Liangyi Software Co., Ltd](https://appshunter.io/developer/1682727762) |

## 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


### Fluid Time

[App page](https://appshunter.io/ios/app/fluid-time-see-time-flow/id6670695819)

Experience a unique digital clock with mesmerizing liquid animations that make numbers flow like water. Track current time or use the countdown feature for events and deadlines with a minimalist, futuristic design.

**Highlights:** Liquid flow number animations, Countdown mode for events, Minimalist and clean interface, Visually stunning time display, Futuristic and captivating effect

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Fluid Time Premium | $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 Fluid Time free?

Fluid Time is free to download, with in-app purchases available.

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

Fluid Time is rated higher. Set Theory Clock (BerlinClock) averages 3.0 out of 5 from 2 ratings, while Fluid Time averages 5.0 from 1 ratings.

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

Neither Set Theory Clock (BerlinClock) nor Fluid Time shows ads.

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

Set Theory Clock (BerlinClock) ships an update every 129 months, and Fluid Time daily. Most recently, Set Theory Clock (BerlinClock) was updated on September 9, 2026 and Fluid Time on June 1, 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.*