Comparison

Set Theory Clock (BerlinClock) vs Fluid Time

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

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
Read full description

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.

About

Fluid Time

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
Read full description

Welcome to Fluid Time – A Stunning Liquid Flow Digital Clock with Countdown Feature! Fluid Time is a unique digital clock app that combines traditional numeric displays with mesmerizing liquid flow animations, offering a visually stunning experience. Each number flows smoothly across the screen like liquid, creating a futuristic and captivating effect, as if time is flowing through your fingertips. Whether placed on your desk or used as your go-to clock tool, Fluid Time adds a touch of technology and art to your everyday routine. Key Features: Liquid Flow Display: Unique liquid animations transform static numbers into a dynamic visual experience, breaking away from traditional clock designs. Countdown Mode: In addition to displaying the current time, Fluid Time now features a countdown mode, letting you visually track time as it flows down to any event or deadline. Minimalist Design: A clean interface combined with visually smooth numeric effects for easy viewing and use. Versatile for Any Setting: Whether for work, study, everyday use, or counting down to a special moment, Fluid Time provides accurate time with an impressive visual experience. Download Fluid Time now and experience the beauty of flowing time – and count down to your next big moment!

Screenshots

Set Theory Clock (BerlinClock)4 screens
Fluid Time2 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard4 real differences · 6 level
Set Theory Clock (BerlinClock) versus Fluid Time: the parameters behind the verdict, then further details
ParameterSet Theory Clock (BerlinClock)Fluid Time
PriceFreeFree
Rating3.0 (2 ratings)5.0 (1 ratings) — better
Positive reviews0.0% of reviews—
Number of ratings2 — better1
Update frequencyEvery 129 monthsDaily — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFreeFree
DevicesiPhoneiPhone, iPod — better
Requires iOS17.615.0 — better
Further details — not scored
Size2 MB40 MB
Age rating4+4+
DeveloperStefan NeumannGuangzhou Liangyi Software Co., Ltd

Customer experience

Set Theory Clock (BerlinClock)

All ratings2 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews1 reviews
Positive0.0%
Neutral100.0%
Negative0.0%

Fluid Time

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Set Theory Clock (BerlinClock)

No in-app purchases

1 purchases

Fluid Time

One-time1
  • Fluid Time Premium$1.99

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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