# Earth Primer vs Kidz Learn Rocks

The clearest difference is price: Kidz Learn Rocks at $2.99 against Earth Primer's $9.99. Kidz Learn Rocks also leads on device support (4 vs 1). Earth Primer's advantage is update cadence (every 3 weeks vs every 29 months) and iOS requirement (7.0 vs 13.0). On ads and in-app purchases there is nothing between them.

Earth Primer costs $9.99 and Kidz Learn Rocks $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Earth Primer ships an update every 3 weeks, Kidz Learn Rocks every 29 months. The most recent releases landed on November 6, 2026 and November 11, 2026 respectively.

## The numbers

| Metric | Earth Primer | Kidz Learn Rocks |
| --- | --- | --- |
| Price | $9.99 | **$2.99** |
| Rating | **[4.7 (35 ratings)](https://appshunter.io/ios/app/earth-primer/id956678532/reviews)** | — |
| Number of ratings | **35** | — |
| Positive reviews | 75.4% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 29 months |
| Monetization | Paid | — |
| Size | 185 MB | 15 MB |
| Requires iOS | **7.0** | 13.0 |
| Devices | iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Chaim Gingold](https://appshunter.io/developer/328361943) | [Gomathy Shankaran](https://appshunter.io/developer/503956143) |

## 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


### Kidz Learn Rocks

[App page](https://appshunter.io/ios/app/kidz-learn-rocks/id1467550863)

**In-app purchases:** none


## Frequently asked questions

### Is Earth Primer free?

Earth Primer costs $9.99, with no in-app purchases.

### Is Kidz Learn Rocks free?

Kidz Learn Rocks costs $2.99, with no in-app purchases.

### Do Earth Primer or Kidz Learn Rocks have ads?

Neither Earth Primer nor Kidz Learn Rocks shows ads.

### Which is updated more often, Earth Primer or Kidz Learn Rocks?

Earth Primer ships an update every 3 weeks, and Kidz Learn Rocks every 29 months. Most recently, Earth Primer was updated on November 6, 2026 and Kidz Learn Rocks on November 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.*