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.
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.
- Fibonacci sequence time display
- Color-coded hour and minute
- Tap for hints
- Adjustable interval flick gestures
- Educational math concept
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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.
Goldbach's Conjecture
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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
Verdict
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
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.
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.
| Parameter | Fibonacci Clock by simple ver | Goldbach's Conjecture |
|---|---|---|
| Price | Free — better | $0.99 |
| Rating | 4.0 (6 ratings) — better | — |
| Positive reviews | 71.4% of reviews | — |
| Number of ratings | 6 — better | — |
| Update frequency | Fortnightly — better | Every 8 months |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPad, iPod — better | iPad, Mac |
| Requires iOS | 12.0 | 12.0 |
| Further details — not scored | ||
| Size | 3 MB | 34 MB |
| Age rating | 4+ | 4+ |
| Developer | YUKI HAYANO | Ventura Educational Systems |
In-app purchases
Fibonacci Clock by simple ver
No in-app purchases
Goldbach's Conjecture
No in-app purchases
Questions
Is Fibonacci Clock by simple ver free?
Is Goldbach's Conjecture free?
Do Fibonacci Clock by simple ver or Goldbach's Conjecture have ads?
Which is updated more often, Fibonacci Clock by simple ver or Goldbach's Conjecture?
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