# RelativityTheory vs Simple Orbit Simulator

The clearest difference is update cadence: Simple Orbit Simulator at every 3 days against RelativityTheory's every 3 weeks. RelativityTheory's advantage is iOS requirement (14.4 vs 18.2). On price, ads, in-app purchases and device support there is nothing between them.

RelativityTheory costs $0.99 and Simple Orbit Simulator $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

RelativityTheory ships an update every 3 weeks, Simple Orbit Simulator every 3 days. The most recent releases landed on September 13, 2026 and September 7, 2026 respectively.

## The numbers

| Metric | RelativityTheory | Simple Orbit Simulator |
| --- | --- | --- |
| Price | $0.99 | $0.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 3 days** |
| Size | 6 MB | 9 MB |
| Requires iOS | **14.4** | 18.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Takao Akatsu](https://appshunter.io/developer/1530946331) | [Bratislav Ljubisic](https://appshunter.io/developer/570434691) |

## What reviewers say

### RelativityTheory

[App page](https://appshunter.io/ios/app/relativitytheory/id1620999874)

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

**In-app purchases:** none


### Simple Orbit Simulator

[App page](https://appshunter.io/ios/app/simple-orbit-simulator/id6762567160)

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

**In-app purchases:** none


## Frequently asked questions

### Is RelativityTheory free?

RelativityTheory costs $0.99, with no in-app purchases.

### Is Simple Orbit Simulator free?

Simple Orbit Simulator costs $0.99, with no in-app purchases.

### Do RelativityTheory or Simple Orbit Simulator have ads?

Neither RelativityTheory nor Simple Orbit Simulator shows ads.

### Which is updated more often, RelativityTheory or Simple Orbit Simulator?

RelativityTheory ships an update every 3 weeks, and Simple Orbit Simulator every 3 days. Most recently, RelativityTheory was updated on September 13, 2026 and Simple Orbit Simulator on September 7, 2026.

---

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