# Probability Toolkit vs Circular Segment Calculator

The clearest difference is update cadence: Probability Toolkit at every 10 months against Circular Segment Calculator's every 23 months. Probability Toolkit also leads on price ($1.99 vs $2.99) and iOS requirement (12.0 vs 16.0). On ads, in-app purchases and device support there is nothing between them.

Probability Toolkit costs $1.99 and Circular Segment Calculator $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Probability Toolkit ships an update every 10 months, Circular Segment Calculator every 23 months. Both last shipped on October 2, 2026.

## The numbers

| Metric | Probability Toolkit | Circular Segment Calculator |
| --- | --- | --- |
| Price | **$1.99** | $2.99 |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/circular-segment-calculator/id1628037532/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 10 months** | Every 23 months |
| Monetization | — | Paid |
| Size | 41 MB | 1 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | iPad | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Ventura Educational Systems](https://appshunter.io/developer/371324172) | [Heng Jia Liang](https://appshunter.io/developer/1532000635) |

## What reviewers say

### Probability Toolkit

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Circular Segment Calculator

[App page](https://appshunter.io/ios/app/circular-segment-calculator/id1628037532)

Instantly calculate all six properties of any circular segment by entering just two values. Ideal for students, engineers, and makers needing quick, reliable geometry solutions on the go.

**Highlights:** Calculate radius, angle, arc length, chord length, height, and area, Two input modes: Angle & Radius or Chord & Height, Real-time results update as you type, Step-by-step formula explanations, Tap to copy results, Supports multiple units and dark mode

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Probability Toolkit free?

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

### Is Circular Segment Calculator free?

Circular Segment Calculator costs $2.99, with no in-app purchases.

### Do Probability Toolkit or Circular Segment Calculator have ads?

Neither Probability Toolkit nor Circular Segment Calculator shows ads.

### Which is updated more often, Probability Toolkit or Circular Segment Calculator?

Probability Toolkit ships an update every 10 months, and Circular Segment Calculator every 23 months. Most recently, Probability Toolkit was updated on October 2, 2026 and Circular Segment Calculator on October 2, 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.*