# GearCalc Pro vs PDF Key

The clearest difference is update cadence: PDF Key at monthly against GearCalc Pro's every 3 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

GearCalc Pro ships an update every 3 months, PDF Key monthly. Both last shipped on October 25, 2026.

## The numbers

| Metric | GearCalc Pro | PDF Key |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Every 3 months | **Monthly** |
| Size | 8 MB | 5 MB |
| Requires iOS | 17.0 | **16.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Sui Fai Law](https://appshunter.io/developer/1889201616) | [Riku Kanai](https://appshunter.io/developer/6779163817) |

## What reviewers say

### GearCalc Pro

[App page](https://appshunter.io/ios/app/gearcalc-pro/id6767600060)

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

**In-app purchases:** none


### PDF Key

[App page](https://appshunter.io/ios/app/pdf-key/id6782367129)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is GearCalc Pro free?

GearCalc Pro is free to download, with no in-app purchases.

### Is PDF Key free?

PDF Key is free to download, with no in-app purchases.

### Do GearCalc Pro or PDF Key have ads?

Both GearCalc Pro and PDF Key show ads.

### Which is updated more often, GearCalc Pro or PDF Key?

GearCalc Pro ships an update every 3 months, and PDF Key monthly. Most recently, GearCalc Pro was updated on October 25, 2026 and PDF Key on October 25, 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.*