# Epicycles vs EqCalc

The clearest difference is in-app purchases: Epicycles at none against EqCalc's 1. Epicycles also leads on update cadence (every 5 days vs every 2 months) and iOS requirement (15.0 vs 18.2). On price, ads and device support there is nothing between them.

Both are free to download. EqCalc sells 1 one-off in-app purchase. Epicycles asks for nothing beyond the download.

Epicycles ships an update every 5 days, EqCalc every 2 months. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Epicycles | EqCalc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/epicycles/id6450433959/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 2 months |
| Monetization | Free | — |
| Size | 4 MB | 11 MB |
| Requires iOS | **15.0** | 18.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [Limit Point Software](https://appshunter.io/developer/377981570) | [Jon Tonouchi](https://appshunter.io/developer/1814163396) |

## What reviewers say

### Epicycles

[App page](https://appshunter.io/ios/app/epicycles/id6450433959)

Explore the visualization of complex Fourier series through interactive epicycles. Create and analyze approximations of parametric curves and complex functions. Save animations and export custom terms for later use.

**Highlights:** Visualize Fourier series of 2D functions, Create epicycles from drawn curves, Save custom terms to documents, Export animations as GIFs, Adjust time and number of terms, Interactive graphic elements

**Features:** macOS Compatibility

**In-app purchases:** none


### EqCalc

[App page](https://appshunter.io/ios/app/eqcalc-g/id6759407516)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Plus Version | $2.99 | one-time |


## Frequently asked questions

### Is Epicycles free?

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

### Is EqCalc free?

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

### Do Epicycles or EqCalc have ads?

Neither Epicycles nor EqCalc shows ads.

### Which is updated more often, Epicycles or EqCalc?

Epicycles ships an update every 5 days, and EqCalc every 2 months. Most recently, Epicycles was updated on October 24, 2026 and EqCalc 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.*