# Gear Design vs Discrete Probability

The clearest difference is price: Discrete Probability at Free against Gear Design's $2.99. Discrete Probability also leads on rating (5.0 vs 1.5) and update cadence (every 4 days vs every 12 months). Gear Design's advantage is iOS requirement (9.3 vs 16.6). On ratings volume, ads and in-app purchases there is nothing between them.

Discrete Probability is free to download; Gear Design costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Discrete Probability holds the better App Store score, 5.0 against 1.5. Both are backed by a comparable volume of ratings — 2 and 4 respectively.

Gear Design ships an update every 12 months, Discrete Probability every 4 days. The most recent releases landed on October 9, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Gear Design | Discrete Probability |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | [1.5 (2 ratings)](https://appshunter.io/ios/app/gear-design/id1136191442/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/discrete-probability/id6752967885/reviews)** |
| Number of ratings | 2 | **4** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 12 months | **Every 4 days** |
| Monetization | Paid | **Free** |
| Size | 38 MB | 9 MB |
| Requires iOS | **9.3** | 16.6 |
| Devices | iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [DRH YAZILIM VE MUHENDISLIK HIZMETLERI LTD STI](https://appshunter.io/developer/914295588) | [Yuri Morozov](https://appshunter.io/developer/1582368813) |

## What reviewers say

### Gear Design

[App page](https://appshunter.io/ios/app/gear-design/id1136191442)

Design involute gears with a CAD interface, allowing visual assessment through touch gestures. Generate and export STL data for 3D printing and perform tooth bending strength analysis with PDF sharing.

**Highlights:** Involute gear design, CAD interface, Touch gesture controls (zoom, rotate), STL data generation, Email export, Tooth bending strength analysis, PDF sharing

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

**In-app purchases:** none


### Discrete Probability

[App page](https://appshunter.io/ios/app/discrete-probability/id6752967885)

This app provides a comprehensive tool for learning and calculating discrete probability distributions. It includes formulas with derivations, visual tools like histograms, and descriptions of optimized computation methods. It covers general concepts and several specific distributions.

**Highlights:** User-friendly calculator, Formulas with derivations, Exportable formulas (image/LaTeX), Optimized computation methods, Histograms and visual tools, General concepts and specific distributions

**In-app purchases:** none


## Frequently asked questions

### Is Gear Design free?

Gear Design costs $2.99, with no in-app purchases.

### Is Discrete Probability free?

Discrete Probability is free to download, with no in-app purchases.

### Which has better reviews, Gear Design or Discrete Probability?

Discrete Probability is rated higher. Gear Design averages 1.5 out of 5 from 2 ratings, while Discrete Probability averages 5.0 from 4 ratings.

### Do Gear Design or Discrete Probability have ads?

Neither Gear Design nor Discrete Probability shows ads.

### Which is updated more often, Gear Design or Discrete Probability?

Gear Design ships an update every 12 months, and Discrete Probability every 4 days. Most recently, Gear Design was updated on October 9, 2026 and Discrete Probability on October 24, 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.*