# DIY Sun Science vs Stars Units Sizes Objects

The clearest difference is ads: DIY Sun Science at none against Stars Units Sizes Objects's shown. DIY Sun Science also leads on rating (4.4 vs 4.2) and monetization model (free vs ad-supported). On price, update cadence, in-app purchases and device support there is nothing between them.

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

DIY Sun Science holds the better App Store score, 4.4 against 4.2. Both are backed by a comparable volume of ratings — 21 and 5 respectively. Written reviews point the same way: 92% of DIY Sun Science's written reviews are positive against 80% of Stars Units Sizes Objects's.

DIY Sun Science ships an update every 6 months, Stars Units Sizes Objects every 4 months. The most recent releases landed on October 17, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | DIY Sun Science | Stars Units Sizes Objects |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (21 ratings)](https://appshunter.io/ios/app/diy-sun-science/id836712493/reviews)** | [4.2 (5 ratings)](https://appshunter.io/ios/app/stars-units-sizes-objects/id1576148571/reviews) |
| Number of ratings | **21** | 5 |
| Positive reviews | **91.7% of reviews** | 80.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 6 months | **Every 4 months** |
| Monetization | **Free** | Ad-supported |
| Size | 134 MB | 124 MB |
| Requires iOS | 12.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [The Lawrence Hall of Science](https://appshunter.io/developer/462994550) | [Mudarmeen Munlin](https://appshunter.io/developer/1348165664) |

## 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


### Stars Units Sizes Objects

[App page](https://appshunter.io/ios/app/stars-units-sizes-objects/id1576148571)

Explore the vastness of the universe, from the smallest particles to the largest cosmic structures. Compare object sizes, view detailed images, and perform unit conversions across a wide range of astronomical scales. Learn about stars, galaxies, and the incredible distances between them.

**Highlights:** Compare object sizes, View object images, Pinch/Zoom and Pan images, Unit conversion for distances, Explore scales from Planck length to observable universe, Learn about stars and galaxies

**Features:** macOS Compatibility

**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 Stars Units Sizes Objects free?

Stars Units Sizes Objects is free to download, with no in-app purchases.

### Which has better reviews, DIY Sun Science or Stars Units Sizes Objects?

DIY Sun Science is rated higher. DIY Sun Science averages 4.4 out of 5 from 21 ratings, while Stars Units Sizes Objects averages 4.2 from 5 ratings.

### Do DIY Sun Science or Stars Units Sizes Objects have ads?

Stars Units Sizes Objects shows ads; DIY Sun Science does not.

### Which is updated more often, DIY Sun Science or Stars Units Sizes Objects?

DIY Sun Science ships an update every 6 months, and Stars Units Sizes Objects every 4 months. Most recently, DIY Sun Science was updated on October 17, 2026 and Stars Units Sizes Objects on September 22, 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.*