Gear Design vs Discrete Probability
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Gear Design
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.
- Involute gear design
- CAD interface
- Touch gesture controls (zoom, rotate)
- STL data generation
- Email export
- Tooth bending strength analysis
- PDF sharing
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Gear Design is great in designing involute gears from scratch. Application includes a CAD interface in front end where users can assess designed gears visually with their finger gestures (zoom, rotate, twist etc.). Users can easily generate STL data of the CAD model and export them via Email (Two step action: first generate data and then export via Email). Tooth bending strength analysis calculator is included with multiple sharing options, including a pdf file.
Discrete Probability
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.
- User-friendly calculator
- Formulas with derivations
- Exportable formulas (image/LaTeX)
- Optimized computation methods
- Histograms and visual tools
- General concepts and specific distributions
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Everything you need to learn and compute discrete distributions — formulas, derivations, and visual tools, all in one app. In Discrete Probability app, everything is in one place: • User-friendly calculator • Formulas with rigorous yet easy-to-follow derivations — exportable as images or LaTeX • Descriptions of optimized computation methods when they differ from the standard formulas • Histograms and other essential visual tools Covered in the first version: • General concepts with definitions and derivations / proofs • Binomial distribution • Geometric distribution • Negative Binomial distribution • Hypergeometric distribution • Poisson distribution We welcome your feedback — write to graphmath@aol.com
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Gear Design | Discrete Probability |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 1.5 (2 ratings) | 5.0 (4 ratings) — better |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 2 | 4 — better |
| Update frequency | Every 12 months | Every 4 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPad | iPhone, iPad, Mac — better |
| Requires iOS | 9.3 — better | 16.6 |
| Further details — not scored | ||
| Size | 38 MB | 9 MB |
| Age rating | 4+ | 4+ |
| Developer | DRH YAZILIM VE MUHENDISLIK HIZMETLERI LTD STI | Yuri Morozov |
Customer experience
Gear Design
Discrete Probability
In-app purchases
Gear Design
No in-app purchases
Discrete Probability
No in-app purchases
Questions
Is Gear Design free?
Is Discrete Probability free?
Which has better reviews, Gear Design or Discrete Probability?
Do Gear Design or Discrete Probability have ads?
Which is updated more often, Gear Design or Discrete Probability?
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