# Fibonacci Clock by simple ver vs Goldbach's Conjecture

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.

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.

## The numbers

| Metric | Fibonacci Clock by simple ver | Goldbach's Conjecture |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[4.0 (6 ratings)](https://appshunter.io/ios/app/fibonacci-clock-by-simple-ver/id996123572/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 71.4% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Fortnightly** | Every 8 months |
| Monetization | Ad-supported | — |
| Size | 3 MB | 34 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | **iPhone, iPad, iPod** | iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [YUKI HAYANO](https://appshunter.io/developer/874819360) | [Ventura Educational Systems](https://appshunter.io/developer/371324172) |

## What reviewers say

### Fibonacci Clock by simple ver

[App page](https://appshunter.io/ios/app/fibonacci-clock-by-simple-ver/id996123572)

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:** macOS Compatibility

**In-app purchases:** none


### Goldbach's Conjecture

[App page](https://appshunter.io/ios/app/goldbachs-conjecture/id1385243580)

**In-app purchases:** none


## Frequently asked 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.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*