# DIY Solar System vs SJSFI Mobile App

DIY Solar System and SJSFI Mobile App are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

DIY Solar System ships an update every 2 months, SJSFI Mobile App every 3 months. The most recent releases landed on October 24, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | DIY Solar System | SJSFI Mobile App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (17 ratings)](https://appshunter.io/ios/app/diy-solar-system/id1644242890/reviews)** | — |
| Number of ratings | **17** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 3 months |
| Monetization | Free | — |
| Size | 180 MB | 70 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [The Lawrence Hall of Science](https://appshunter.io/developer/462994550) | [Livro Systems Incorporated](https://appshunter.io/developer/1896544025) |

## What reviewers say

### DIY Solar System

[App page](https://appshunter.io/ios/app/diy-solar-system/id1644242890)

Explore the solar system with interactive activities and an augmented reality planet walk. Learn about space travel, design a moon base, and identify celestial objects. Developed by leading science institutions, this app makes learning about space engaging for families and educators.

**Highlights:** Interactive space activities, Augmented reality planet walk, Design a moon base, Grow a space garden, Control a Mars rover, In or Out space game, NASA imagery

**Features:** macOS Compatibility

**In-app purchases:** none


### SJSFI Mobile App

[App page](https://appshunter.io/ios/app/sjsfi-mobile-app/id6754417150)

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

**In-app purchases:** none


## Frequently asked questions

### Is DIY Solar System free?

DIY Solar System is free to download, with no in-app purchases.

### Is SJSFI Mobile App free?

SJSFI Mobile App is free to download, with no in-app purchases.

### Do DIY Solar System or SJSFI Mobile App have ads?

Neither DIY Solar System nor SJSFI Mobile App shows ads.

### Which is updated more often, DIY Solar System or SJSFI Mobile App?

DIY Solar System ships an update every 2 months, and SJSFI Mobile App every 3 months. Most recently, DIY Solar System was updated on October 24, 2026 and SJSFI Mobile App on October 16, 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.*