# Solar System Sim vs UniPad

The clearest difference is rating: UniPad at 5.0 against Solar System Sim's 4.5. UniPad also leads on in-app purchases (none vs 5) and ads (none vs shown). Solar System Sim's advantage is ratings volume (4.3K vs 1) and update cadence (every 4 days vs every 10 days). On price and device support there is nothing between them.

Both are free to download. Solar System Sim sells 5 one-off in-app purchases. UniPad asks for nothing beyond the download.

UniPad holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Solar System Sim has 4.3K ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 80% of Solar System Sim's written reviews are positive against 100% of UniPad's.

Solar System Sim ships an update every 4 days, UniPad every 10 days. The most recent releases landed on October 17, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Solar System Sim | UniPad |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (4.3K ratings)](https://appshunter.io/ios/app/solar-system-sim/id6447612221/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/unipad/id6760479102/reviews)** |
| Number of ratings | **4.3K** | 1 |
| Positive reviews | 80.2% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 4 days** | Every 10 days |
| Monetization | Free with in-app purchases | **Free** |
| Size | 532 MB | 10 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [WPC](https://appshunter.io/developer/1681830786) | [jisub kim](https://appshunter.io/developer/1884657216) |

## What reviewers say

### Solar System Sim

[App page](https://appshunter.io/ios/app/solar-system-sim/id6447612221)

Simulate and explore celestial bodies within our solar system and beyond. Create your own solar systems, experiment with gravity and physics, and observe orbital mechanics in action.

**Highlights:** Explore planets and moons, Visit nearby stars, Create custom solar systems, Gravity and physics simulation, Recalculate orbits, Newton's laws implementation

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HD Mars | $2.99 | one-time |
| HD Earth | $2.99 | one-time |
| HD Moon | $2.99 | one-time |
| No-ads | $3.99 | one-time |
| HD 3-body pack | $6.99 | one-time |

**What reviewers like**

- 🚀 Realistic simulation
- 🚀 Detailed solar system
- 🚀 Ability to create custom solar systems
- 🚀 Impressive graphics
- 🚀 Frequent updates

**What reviewers complain about**

- 🐛 Crashes and glitches
- 🔋 High battery consumption
- 💰 Excessive ads
- 🐛 Saving and loading issues
- 🐛 Unstable orbits

**Reported bugs**

- Planets/moons disappearing after saving and loading
- Bright flashes and screen distortions
- Planets/objects getting stuck inside stars
- Crashes when colliding or editing certain objects
- Inconsistent orbital mechanics and moons ejecting from planets

**Requested features**

- Add more galaxy and nebula textures
- Implement realistic supernova effects
- Allow customization of planet atmospheres and terrain
- Add binary star systems and rogue planets
- Introduce a galaxy maker and collision feature


### UniPad

[App page](https://appshunter.io/ios/app/unipad/id6760479102)

Create and play your own rhythm music with a vast library of songs and customizable skins. Connect external MIDI equipment for an enhanced experience. Practice tools are included to help you master your tracks.

**Highlights:** 40+ base songs, Create custom project files, Automatic playback and practice features, Customizable skins, Launchpad and MIDI equipment connection

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

**In-app purchases:** none


## Frequently asked questions

### Is Solar System Sim free?

Solar System Sim is free to download, with in-app purchases available.

### Is UniPad free?

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

### Which has better reviews, Solar System Sim or UniPad?

UniPad is rated higher. Solar System Sim averages 4.5 out of 5 from 4.3K ratings, while UniPad averages 5.0 from 1 ratings.

### Do Solar System Sim or UniPad have ads?

Solar System Sim shows ads; UniPad does not.

### Which is updated more often, Solar System Sim or UniPad?

Solar System Sim ships an update every 4 days, and UniPad every 10 days. Most recently, Solar System Sim was updated on October 17, 2026 and UniPad on October 11, 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.*