Comparison

Fibonacci Clock by simple ver vs Goldbach's Conjecture

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

Head to head
About

Fibonacci Clock by simple ver

This app displays time using a unique color-coded system based on the Fibonacci sequence. It's designed to be a challenging yet educational way to tell time, with hints available and adjustable intervals.

Highlights
  • Fibonacci sequence time display
  • Color-coded hour and minute
  • Tap for hints
  • Adjustable interval flick gestures
  • Educational math concept
Features
Read full description

This is a clock. but too difficult to read. hour = red + blue minute = (green + blue) * 5 if you tap , you find this hint. if you up or down flick, you can change an interval.

About

Goldbach's Conjecture

Read full description

Fun and Challenging! Goldbach's Conjecture introduces students to an idea that has baffled mathematicians for centuries. In 1742, a Russian mathematician named Christian Goldbach wrote a letter to Leonhard Euler in which he proposed a conjecture. The conjecture stated that all even numbers greater than two can be expressed as the sum of two primes. This app challenges the player to find two prime numbers to make a target even number. Completing the activity involves using mental math skills. Goldbach Conjecture is designed to be a quick math exercise that teachers can use to provide extra practice in problem solving and an enriching experience for their students. Special sound effects make the game fun to use and the interactive design facilitate problem solving strategies.

Screenshots

Fibonacci Clock by simple ver2 screens

Verdict

The call

The clearest difference is price: Fibonacci Clock by simple ver at Free against Goldbach's Conjecture's $0.99. Fibonacci Clock by simple ver also leads on update cadence (fortnightly vs every 8 months). Goldbach's Conjecture's advantage is ads (none vs shown). On in-app purchases, device support and iOS requirement 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

Fibonacci Clock by simple ver is free to download; Goldbach's Conjecture costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Fibonacci Clock by simple ver ships an update fortnightly, Goldbach's Conjecture every 8 months. The most recent releases landed on October 15, 2026 and October 3, 2026 respectively.

Scorecard3 real differences · 7 level
Fibonacci Clock by simple ver versus Goldbach's Conjecture: the parameters behind the verdict, then further details
ParameterFibonacci Clock by simple verGoldbach's Conjecture
PriceFree — better$0.99
Rating4.0 (6 ratings) — better—
Positive reviews71.4% of reviews—
Number of ratings6 — better—
Update frequencyFortnightly — betterEvery 8 months
AdsYesNo — better
In-app purchasesNoNo
MonetizationAd-supported—
DevicesiPhone, iPad, iPod — betteriPad, Mac
Requires iOS12.012.0
Further details — not scored
Size3 MB34 MB
Age rating4+4+
DeveloperYUKI HAYANOVentura Educational Systems

In-app purchases

None

Fibonacci Clock by simple ver

No in-app purchases

None

Goldbach's Conjecture

No in-app purchases

Questions

Is Fibonacci Clock by simple ver free?
Fibonacci Clock by simple ver is free to download, with no in-app purchases.
Is Goldbach's Conjecture free?
Goldbach's Conjecture costs $0.99, with no in-app purchases.
Do Fibonacci Clock by simple ver or Goldbach's Conjecture have ads?
Fibonacci Clock by simple ver shows ads; Goldbach's Conjecture does not.
Which is updated more often, Fibonacci Clock by simple ver or Goldbach's Conjecture?
Fibonacci Clock by simple ver ships an update fortnightly, and Goldbach's Conjecture every 8 months. Most recently, Fibonacci Clock by simple ver was updated on October 15, 2026 and Goldbach's Conjecture on October 3, 2026.

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