# DIY Solar System vs ASTC

The clearest difference is review sentiment: DIY Solar System at 100% against ASTC's 0%. DIY Solar System also leads on update cadence (every 2 months vs every 12 months) and iOS requirement (12.0 vs 15.5). ASTC's advantage is rating (4.7 vs 4.5). On price, ratings volume, ads and in-app purchases there is nothing between them.

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

ASTC holds the better App Store score, 4.7 against 4.5. Both are backed by a comparable volume of ratings — 16 and 30 respectively. Written reviews complicate that: 100% of DIY Solar System's written reviews are positive against 0% of ASTC's, so the app with the better star average is not the one people write more warmly about.

DIY Solar System ships an update every 2 months, ASTC every 12 months. The most recent releases landed on June 3, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | DIY Solar System | ASTC |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (16 ratings)](https://appshunter.io/ios/app/diy-solar-system/id1644242890/reviews) | **[4.7 (30 ratings)](https://appshunter.io/ios/app/astc/id6466039138/reviews)** |
| Number of ratings | 16 | **30** |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 12 months |
| Monetization | Free | Free |
| Size | 180 MB | 87 MB |
| Requires iOS | **12.0** | 15.5 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [The Lawrence Hall of Science](https://appshunter.io/developer/462994550) | [ASSOCIATION OF SCIENCE-TECHNOLOGY CENTERS, INC.](https://appshunter.io/developer/1437372010) |

## 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


### ASTC

[App page](https://appshunter.io/ios/app/astc/id6466039138)

Enhance your conference experience by accessing schedules, speaker details, and exhibitor information. Take notes directly on presentation slides in real-time and share insights with attendees via in-app messaging, tweeting, or email.

**Highlights:** View conference schedule, Access speaker and exhibitor details, Take real-time notes on slides, Draw directly on presentation slides, In-app messaging with attendees, Share information via tweet/email

**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 ASTC free?

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

### Which has better reviews, DIY Solar System or ASTC?

ASTC is rated higher. DIY Solar System averages 4.5 out of 5 from 16 ratings, while ASTC averages 4.7 from 30 ratings.

### Do DIY Solar System or ASTC have ads?

Neither DIY Solar System nor ASTC shows ads.

### Which is updated more often, DIY Solar System or ASTC?

DIY Solar System ships an update every 2 months, and ASTC every 12 months. Most recently, DIY Solar System was updated on June 3, 2026 and ASTC on September 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.*