# Solar Book vs CloudLabs What is Light?

The clearest difference is rating: CloudLabs What is Light? at 5.0 against Solar Book's 4.7. CloudLabs What is Light? also leads on update cadence (every 6 months vs every 14 months) and iOS requirement (10.0 vs 12.0). Solar Book's advantage is ratings volume (3 vs 1). On price, ads, in-app purchases and monetization model there is nothing between them.

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

CloudLabs What is Light? holds the better App Store score, 5.0 against 4.7. Both are backed by a comparable volume of ratings — 3 and 1 respectively.

Solar Book ships an update every 14 months, CloudLabs What is Light? every 6 months. The most recent releases landed on June 1, 2026 and June 11, 2026 respectively.

## The numbers

| Metric | Solar Book | CloudLabs What is Light? |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (3 ratings)](https://appshunter.io/ios/app/solar-book/id1078873201/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/cloudlabs-what-is-light/id1660127883/reviews)** |
| Number of ratings | **3** | 1 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 14 months | **Every 6 months** |
| Monetization | Free | Free |
| Size | 5 MB | 171 MB |
| Requires iOS | 12.0 | **10.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Vixen Co., Ltd.](https://appshunter.io/developer/536188843) | [Jiovany Orozco](https://appshunter.io/developer/1114670847) |

## What reviewers say

### Solar Book

[App page](https://appshunter.io/ios/app/solar-book/id1078873201)

This app provides detailed information about solar eclipses, including timings for different phases based on your location. It allows you to view sequential images and star charts for planning and observation.

**Highlights:** Solar eclipse phase timing, Location-based eclipse calculations, Sequential eclipse image display, Star chart visualization, Past and future eclipse planning

**In-app purchases:** none


### CloudLabs What is Light?

[App page](https://appshunter.io/ios/app/cloudlabs-what-is-light/id1660127883)

Explore the nature of light through interactive simulations. Classify natural and artificial light sources and experiment with how light interacts with various materials. This educational tool offers a hands-on approach to understanding fundamental physics concepts.

**Highlights:** Classify natural and artificial light sources, Simulate light travel through materials, Interactive educational experiments, Understand light physics concepts

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Solar Book free?

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

### Is CloudLabs What is Light? free?

CloudLabs What is Light? is free to download, with no in-app purchases.

### Which has better reviews, Solar Book or CloudLabs What is Light??

CloudLabs What is Light? is rated higher. Solar Book averages 4.7 out of 5 from 3 ratings, while CloudLabs What is Light? averages 5.0 from 1 ratings.

### Do Solar Book or CloudLabs What is Light? have ads?

Neither Solar Book nor CloudLabs What is Light? shows ads.

### Which is updated more often, Solar Book or CloudLabs What is Light??

Solar Book ships an update every 14 months, and CloudLabs What is Light? every 6 months. Most recently, Solar Book was updated on June 1, 2026 and CloudLabs What is Light? on June 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.*