# Probability Toolkit vs Fibonacci Clock by simple ver

The clearest difference is price: Fibonacci Clock by simple ver at Free against Probability Toolkit's $1.99. Fibonacci Clock by simple ver also leads on update cadence (fortnightly vs every 10 months) and device support (3 vs 1). Probability Toolkit's advantage is ads (none vs shown). On in-app purchases and iOS requirement there is nothing between them.

Fibonacci Clock by simple ver is free to download; Probability Toolkit costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Probability Toolkit ships an update every 10 months, Fibonacci Clock by simple ver fortnightly. The most recent releases landed on October 26, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Probability Toolkit | Fibonacci Clock by simple ver |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| 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 | **No** | Yes |
| Update frequency | Every 10 months | **Fortnightly** |
| Monetization | — | Ad-supported |
| Size | 41 MB | 3 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Ventura Educational Systems](https://appshunter.io/developer/371324172) | [YUKI HAYANO](https://appshunter.io/developer/874819360) |

## What reviewers say

### Probability Toolkit

[App page](https://appshunter.io/ios/app/probability-toolkit/id652216774)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Probability Toolkit free?

Probability Toolkit costs $1.99, with no in-app purchases.

### Is Fibonacci Clock by simple ver free?

Fibonacci Clock by simple ver is free to download, with no in-app purchases.

### Do Probability Toolkit or Fibonacci Clock by simple ver have ads?

Fibonacci Clock by simple ver shows ads; Probability Toolkit does not.

### Which is updated more often, Probability Toolkit or Fibonacci Clock by simple ver?

Probability Toolkit ships an update every 10 months, and Fibonacci Clock by simple ver fortnightly. Most recently, Probability Toolkit was updated on October 26, 2026 and Fibonacci Clock by simple ver on October 15, 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.*