# F.A.S.T vs Epicycles

The clearest difference is update cadence: Epicycles at every 5 days against F.A.S.T's every 19 months. Epicycles also leads on rating (5.0 vs 4.6). F.A.S.T's advantage is ratings volume (23 vs 2). On price, ads, in-app purchases and monetization model there is nothing between them.

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

Epicycles holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: F.A.S.T has 23 ratings behind it against 2, so its average is the more settled of the two.

F.A.S.T ships an update every 19 months, Epicycles every 5 days. The most recent releases landed on August 24, 2026 and June 5, 2026 respectively.

## The numbers

| Metric | F.A.S.T | Epicycles |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (23 ratings)](https://appshunter.io/ios/app/fast/id1217030092/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/epicycles/id6450433959/reviews)** |
| Number of ratings | **23** | 2 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 19 months | **Every 5 days** |
| Monetization | Free | Free |
| Size | 4 MB | 4 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Philippe Zay](https://appshunter.io/developer/1200498230) | [Limit Point Software](https://appshunter.io/developer/377981570) |

## What reviewers say

### F.A.S.T

[App page](https://appshunter.io/ios/app/fast/id1217030092)

Create and customize mesmerizing mathematical spirals, including Archimedean and logarithmic forms. Offers intuitive controls for precise adjustments to curvature, color, and patterns. Ideal for creative discovery and educational exploration.

**Highlights:** Archimedean & Logarithmic Spirals, Intuitive Controls, Dynamic Colorization, Expert Mode, Dark Mode Support, Cross-device Compatibility

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

**In-app purchases:** none


### 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


## Frequently asked questions

### Is F.A.S.T free?

F.A.S.T is free to download, with no in-app purchases.

### Is Epicycles free?

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

### Which has better reviews, F.A.S.T or Epicycles?

Epicycles is rated higher. F.A.S.T averages 4.6 out of 5 from 23 ratings, while Epicycles averages 5.0 from 2 ratings.

### Do F.A.S.T or Epicycles have ads?

Neither F.A.S.T nor Epicycles shows ads.

### Which is updated more often, F.A.S.T or Epicycles?

F.A.S.T ships an update every 19 months, and Epicycles every 5 days. Most recently, F.A.S.T was updated on August 24, 2026 and Epicycles on June 5, 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.*