# Planetary Gear Calculator vs KiSoft Driver

The clearest difference is price: KiSoft Driver at Free against Planetary Gear Calculator's $3.99. KiSoft Driver also leads on update cadence (fortnightly vs every 46 months). Planetary Gear Calculator's advantage is iOS requirement (13 vs 15.1). On ads, in-app purchases and device support there is nothing between them.

KiSoft Driver is free to download; Planetary Gear Calculator costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Planetary Gear Calculator ships an update every 46 months, KiSoft Driver fortnightly. The most recent releases landed on October 18, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Planetary Gear Calculator | KiSoft Driver |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | **[4.7 (6 ratings)](https://appshunter.io/ios/app/planetary-gear-calculator/id1618146516/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 75.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 46 months | **Fortnightly** |
| Monetization | Paid | — |
| Size | 1 MB | 177 MB |
| Requires iOS | **13** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | +4 | 4+ |
| Developer | [Heng Jia Liang](https://appshunter.io/developer/1532000635) | [KNAPP AG](https://appshunter.io/developer/1055601115) |

## What reviewers say

### Planetary Gear Calculator

[App page](https://appshunter.io/ios/app/planetary-gear-calculator/id1618146516)

Calculate gear teeth and speed for planetary gear systems. Quickly simulate how these systems work on the fly, ideal for DIYers designing their own systems before 3D printing. Understand the formulas and components of epicyclic gear systems.

**Highlights:** Calculate gear teeth, Calculate gear speed, Simulate planetary gear systems, Design custom gear systems, Preview system functionality, Understand gear formulas

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

**In-app purchases:** none


### KiSoft Driver

[App page](https://appshunter.io/ios/app/kisoft-driver/id6449995253)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Planetary Gear Calculator free?

Planetary Gear Calculator costs $3.99, with no in-app purchases.

### Is KiSoft Driver free?

KiSoft Driver is free to download, with no in-app purchases.

### Do Planetary Gear Calculator or KiSoft Driver have ads?

Neither Planetary Gear Calculator nor KiSoft Driver shows ads.

### Which is updated more often, Planetary Gear Calculator or KiSoft Driver?

Planetary Gear Calculator ships an update every 46 months, and KiSoft Driver fortnightly. Most recently, Planetary Gear Calculator was updated on October 18, 2026 and KiSoft Driver on October 17, 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.*