# Epicycles vs 2PD

The clearest difference is update cadence: Epicycles at every 5 days against 2PD's every 2 months. Epicycles also leads on iOS requirement (15.0 vs 17.6). On price, rating, ratings volume and ads there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for Epicycles against 5.0 for 2PD. Both are backed by a comparable volume of ratings — 2 and 2 respectively.

Epicycles ships an update every 5 days, 2PD every 2 months. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Epicycles | 2PD |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/epicycles/id6450433959/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/2pd/id6761318358/reviews) |
| Number of ratings | 2 | 2 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 2 months |
| Monetization | Free | Free |
| Size | 4 MB | 4 MB |
| Requires iOS | **15.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Limit Point Software](https://appshunter.io/developer/377981570) | [Keyvon Rashidi](https://appshunter.io/developer/1825970126) |

## 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


### 2PD

[App page](https://appshunter.io/ios/app/2pd/id6761318358)

This utility generates customizable 3D printable models for two-point discrimination devices. Easily define spacing and create ready-to-print STL files for various 3D printers.

**Highlights:** Generate customizable two-point discrimination device files, Adjust spacing values with a parametric workflow, Access preset configurations, Create custom device variations, Export ready-to-print STL files, Support FDM and SLA printing

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

**In-app purchases:** none


## Frequently asked questions

### Is Epicycles free?

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

### Is 2PD free?

2PD is free to download, with no in-app purchases.

### Which has better reviews, Epicycles or 2PD?

Epicycles and 2PD are both rated 5.0 out of 5 on the App Store, from 2 and 2 ratings respectively.

### Do Epicycles or 2PD have ads?

Neither Epicycles nor 2PD shows ads.

### Which is updated more often, Epicycles or 2PD?

Epicycles ships an update every 5 days, and 2PD every 2 months. Most recently, Epicycles was updated on November 3, 2026 and 2PD on October 31, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*