# Fomcal vs Planetary Gear Calculator

The clearest difference is in-app purchases: Planetary Gear Calculator at none against Fomcal's 1. Fomcal's advantage is update cadence (every 3 months vs every 46 months) and price ($1.99 vs $3.99). On review sentiment, ads, device support and iOS requirement there is nothing between them.

Fomcal costs $1.99 and Planetary Gear Calculator $3.99 up front. Fomcal sells 1 one-off in-app purchase. Planetary Gear Calculator asks for nothing beyond the download.

Fomcal ships an update every 3 months, Planetary Gear Calculator every 46 months. The most recent releases landed on November 1, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Fomcal | Planetary Gear Calculator |
| --- | --- | --- |
| Price | **$1.99** | $3.99 |
| 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 | 75.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 46 months |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 6 MB | 1 MB |
| Requires iOS | **12.0** | 13 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | +4 |
| Developer | [NOBORU IMAI](https://appshunter.io/developer/896071356) | [Heng Jia Liang](https://appshunter.io/developer/1532000635) |

## What reviewers say

### Fomcal

[App page](https://appshunter.io/ios/app/fomcal/id954145664)

This app allows you to create and save custom calculation formulas for daily use. It supports complex functions, logical operations, and parameter studies, with options to export results as CSV. An optional numeric pad enhances input efficiency.

**Highlights:** Save and reuse custom formulas, Support for logical and comparison functions, Parameter study for variable analysis, Export results as CSV, Optional enhanced numeric pad, Extended syntax for branching and iteration

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Enhancements | $1.99 | one-time |


### 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


## Frequently asked questions

### Is Fomcal free?

Fomcal costs $1.99, and also offers in-app purchases.

### Is Planetary Gear Calculator free?

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

### Do Fomcal or Planetary Gear Calculator have ads?

Neither Fomcal nor Planetary Gear Calculator shows ads.

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

Fomcal ships an update every 3 months, and Planetary Gear Calculator every 46 months. Most recently, Fomcal was updated on November 1, 2026 and Planetary Gear Calculator on October 30, 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.*