# DIY Sun Science vs ASTC

The clearest difference is review sentiment: DIY Sun Science at 92% against ASTC's 0%. DIY Sun Science also leads on iOS requirement (12.0 vs 15.5). ASTC's advantage is rating (4.7 vs 4.4). On price, ratings volume, update cadence and ads 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 4.4. Both are backed by a comparable volume of ratings — 21 and 30 respectively. Written reviews complicate that: 92% of DIY Sun Science'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 Sun Science ships an update every 6 months, ASTC every 12 months. The most recent releases landed on June 3, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | DIY Sun Science | ASTC |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.4 (21 ratings)](https://appshunter.io/ios/app/diy-sun-science/id836712493/reviews) | **[4.7 (30 ratings)](https://appshunter.io/ios/app/astc/id6466039138/reviews)** |
| Number of ratings | 21 | **30** |
| Positive reviews | **91.7% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 months** | Every 12 months |
| Monetization | Free | Free |
| Size | 134 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 Sun Science

[App page](https://appshunter.io/ios/app/diy-sun-science/id836712493)

Explore the Sun through hands-on activities and real-time data. This app offers 15 engaging experiments, live solar images from NASA, and educational videos to foster understanding of solar science for families and educators.

**Highlights:** 15 hands-on solar activities, Step-by-step instructions, Live Sun images from NASA SDO, NASA Earth and space observatory images, NASA solar videos, Learn about solar activity

**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 Sun Science free?

DIY Sun Science 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 Sun Science or ASTC?

ASTC is rated higher. DIY Sun Science averages 4.4 out of 5 from 21 ratings, while ASTC averages 4.7 from 30 ratings.

### Do DIY Sun Science or ASTC have ads?

Neither DIY Sun Science nor ASTC shows ads.

### Which is updated more often, DIY Sun Science or ASTC?

DIY Sun Science ships an update every 6 months, and ASTC every 12 months. Most recently, DIY Sun Science 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.*