# Phys. Lab vs Solar System

The clearest difference is price: Solar System at Free against Phys. Lab's $4.99. Phys. Lab's advantage is in-app purchases (none vs 3) and update cadence (fortnightly vs every 6 weeks). On ads there is nothing between them.

Solar System is free to download; Phys. Lab costs $4.99 up front. Solar System sells 3 in-app purchases, starting at $2.99 per 7 days. Phys. Lab asks for nothing beyond the download.

Phys. Lab ships an update fortnightly, Solar System every 6 weeks. Both last shipped on November 5, 2026.

## The numbers

| Metric | Phys. Lab | Solar System |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 6 weeks |
| Size | 24 MB | 25 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [坤 冉](https://appshunter.io/developer/1759927074) | [Phuc Pham](https://appshunter.io/developer/1893081423) |

## What reviewers say

### Phys. Lab

[App page](https://appshunter.io/ios/app/phys-lab/id6744642758)

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

**In-app purchases:** none


### Solar System

[App page](https://appshunter.io/ios/app/solar-system-planet-atlas/id6771436789)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $2.99 | per 7 days |
| Yearly | $14.99 | per year |
| Lifetime Pro | $29.99 | one-time |


## Frequently asked questions

### Is Phys. Lab free?

Phys. Lab costs $4.99, with no in-app purchases.

### Is Solar System free?

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

### Do Phys. Lab or Solar System have ads?

Neither Phys. Lab nor Solar System shows ads.

### Which is updated more often, Phys. Lab or Solar System?

Phys. Lab ships an update fortnightly, and Solar System every 6 weeks. Most recently, Phys. Lab was updated on November 5, 2026 and Solar System on November 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.*