# Gear Calculator Pro vs Tolerance Master

The clearest difference is update cadence: Gear Calculator Pro at every 4 days against Tolerance Master's every 6 months. Gear Calculator Pro also leads on device support (4 vs 2) and iOS requirement (13.0 vs 17.0). On price, ads and in-app purchases there is nothing between them.

Both are free to download. Gear Calculator Pro sells 1 one-off in-app purchase and Tolerance Master sells 1 in-app purchase, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

Gear Calculator Pro ships an update every 4 days, Tolerance Master every 6 months. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Gear Calculator Pro | Tolerance Master |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/gear-calculator-pro/id6463792360/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 6 months |
| Monetization | Free with in-app purchases | — |
| Size | 6 MB | 3 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [志桂 李](https://appshunter.io/developer/1686507153) | [磊 高](https://appshunter.io/developer/1879509033) |

## What reviewers say

### Gear Calculator Pro

[App page](https://appshunter.io/ios/app/gear-calculator-pro/id6463792360)

This professional mechanical design tool helps engineers and enthusiasts calculate and optimize various gear parameters. It offers accurate calculations for different gear types, custom parameter input, and real-time design previews.

**Highlights:** Accurate calculations for spur, helical, and worm gears, Customizable design parameters, Real-time calculation previews, Efficient gear design formulas and tools, User-friendly interface for all levels

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 永久会员 | $9.99 | one-time |


### Tolerance Master

[App page](https://appshunter.io/ios/app/tolerance-master/id6759722609)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Version | $0.99 | per month |


## Frequently asked questions

### Is Gear Calculator Pro free?

Gear Calculator Pro is free to download, with in-app purchases available.

### Is Tolerance Master free?

Tolerance Master is free to download, with in-app purchases available.

### Do Gear Calculator Pro or Tolerance Master have ads?

Neither Gear Calculator Pro nor Tolerance Master shows ads.

### Which is updated more often, Gear Calculator Pro or Tolerance Master?

Gear Calculator Pro ships an update every 4 days, and Tolerance Master every 6 months. Most recently, Gear Calculator Pro was updated on November 3, 2026 and Tolerance Master on October 31, 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.*