# ER3D Euler Rotations in 3D vs OrbitCalc

The clearest difference is in-app purchases: ER3D Euler Rotations in 3D at none against OrbitCalc's 1. On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. OrbitCalc sells 1 one-off in-app purchase. ER3D Euler Rotations in 3D asks for nothing beyond the download.

## The numbers

| Metric | ER3D Euler Rotations in 3D | OrbitCalc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/orbitcalc/id6743425109/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Monetization | — | Free |
| Size | 114 MB | 11 MB |
| Requires iOS | 18.0 | 18.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Eliott Radcliffe](https://appshunter.io/developer/1477487767) | [Bian Dhoan Kwik](https://appshunter.io/developer/1793925532) |

## What reviewers say

### ER3D Euler Rotations in 3D

[App page](https://appshunter.io/ios/app/er3d-euler-rotations-in-3d/id6741169432)

**Features:** macOS Compatibility

**In-app purchases:** none


### OrbitCalc

[App page](https://appshunter.io/ios/app/orbitcalc/id6743425109)

This tool helps space enthusiasts, engineers, and researchers precisely calculate satellite orbits. It allows users to determine orbital parameters from vector data or vice versa with accurate results. Save and manage your calculations, and customize measurement units for a personalized experience.

**Highlights:** Orbital calculations from parameters or vectors, Save and revisit previous calculations, History page for managing saved work, Customizable measurement units

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| OrbitCalc Pro | $0.99 | one-time |


## Frequently asked questions

### Is ER3D Euler Rotations in 3D free?

ER3D Euler Rotations in 3D is free to download, with no in-app purchases.

### Is OrbitCalc free?

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

### Do ER3D Euler Rotations in 3D or OrbitCalc have ads?

Neither ER3D Euler Rotations in 3D nor OrbitCalc shows ads.

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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.*