# Earth Primer vs CloudLabs What is Light?

The clearest difference is price: CloudLabs What is Light? at Free against Earth Primer's $9.99. CloudLabs What is Light? also leads on rating (5.0 vs 4.7) and device support (3 vs 1). Earth Primer's advantage is update cadence (every 3 weeks vs every 6 months) and ratings volume (35 vs 1). On ads and in-app purchases there is nothing between them.

CloudLabs What is Light? is free to download; Earth Primer costs $9.99 up front. 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. That said, the two scores are not equally well evidenced: Earth Primer has 35 ratings behind it against 1, so its average is the more settled of the two.

Earth Primer ships an update every 3 weeks, CloudLabs What is Light? every 6 months. The most recent releases landed on October 24, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Earth Primer | CloudLabs What is Light? |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | [4.7 (35 ratings)](https://appshunter.io/ios/app/earth-primer/id956678532/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/cloudlabs-what-is-light/id1660127883/reviews)** |
| Number of ratings | **35** | 1 |
| Positive reviews | 75.4% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 6 months |
| Monetization | Paid | **Free** |
| Size | 185 MB | 171 MB |
| Requires iOS | **7.0** | 10.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Chaim Gingold](https://appshunter.io/developer/328361943) | [Jiovany Orozco](https://appshunter.io/developer/1114670847) |

## What reviewers say

### Earth Primer

[App page](https://appshunter.io/ios/app/earth-primer/id956678532)

Explore Earth's geological processes through interactive play. Sculpt mountains, create volcanoes, and manipulate natural forces to understand planetary science in a fun, engaging way.

**Highlights:** Discover how Earth works through play, Control natural forces like volcanoes and tectonic plates, 20 different tools to unlock, Richly interactive geological simulations, Five chapters: Earth's Interior, Surface, Water Cycle, Biomes, and Sandbox, Sandbox mode for open-ended play

**In-app purchases:** none

**What reviewers like**

- 💡 Brilliant educational tool
- 👍 Intuitive and interactive simulations
- ✨ Stunning graphics and artful illustrations
- 🚀 Excellent for learning geology
- 🤩 Fun and engaging for all ages

**What reviewers complain about**

- 🐛 Some options grayed out in sandbox mode
- 🤔 Lacks depth in certain simulations
- 😕 Interface can be confusing for new users
- 📉 Some users find it boring after initial use
- 💰 Expensive for some users

**Reported bugs**

- 🐛 Grayed out options in sandbox mode on iOS 12.1.3
- 🐛 Unreadable on iPad Pro
- 🐛 Broken software on iPad Pro
- 🐛 Still not working on iPad Pro
- 🐛 Does not work on iPad Pro

**Requested features**

- Add a sandbox version for 2D earth
- Add 3D models for volcanoes
- Include simulated volcanic eruptions, earthquakes, and tsunamis
- Add a sandbox simulation program for these phenomena
- Add humans and animals to sandbox mode to observe civilization building and impact


### 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 Earth Primer free?

Earth Primer costs $9.99, 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, Earth Primer or CloudLabs What is Light??

CloudLabs What is Light? is rated higher. Earth Primer averages 4.7 out of 5 from 35 ratings, while CloudLabs What is Light? averages 5.0 from 1 ratings.

### Do Earth Primer or CloudLabs What is Light? have ads?

Neither Earth Primer nor CloudLabs What is Light? shows ads.

### Which is updated more often, Earth Primer or CloudLabs What is Light??

Earth Primer ships an update every 3 weeks, and CloudLabs What is Light? every 6 months. Most recently, Earth Primer was updated on October 24, 2026 and CloudLabs What is Light? on October 7, 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.*