# Planetarium Projector vs Smithsonian

The clearest difference is review sentiment: Smithsonian at 100% against Planetarium Projector's 22%. Planetarium Projector's advantage is in-app purchases (none vs 2). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Smithsonian sells 2 one-off in-app purchases. Planetarium Projector asks for nothing beyond the download.

Planetarium Projector ships an update every 2 months, Smithsonian every 3 months. The most recent releases landed on October 11, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Planetarium Projector | Smithsonian |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 22.2% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 3 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 574 MB | 285 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Clementoni S.p.A.](https://appshunter.io/developer/575135209) | [PlayDate Digital](https://appshunter.io/developer/652113715) |

## What reviewers say

### Planetarium Projector

[App page](https://appshunter.io/ios/app/planetarium-projector/id6471595659)

Explore the universe with interactive lessons on constellations, planets, and space exploration. Engage with 3D augmented reality models and fun quizzes to learn about space history and mythology.

**Highlights:** Interactive space narrator, Augmented reality 3D models, Constellation drawing, Space conquest quiz, Planet and space facts, Rocket launching game

**Features:** macOS Compatibility

**In-app purchases:** none


### Smithsonian

[App page](https://appshunter.io/ios/app/smithsonian-planets/id6504839302)

Explore the solar system with interactive games and animations. Learn fascinating facts about planets, moons, and the asteroid belt. Designed for curious young minds to introduce astronomy basics.

**Highlights:** Fascinating facts about the solar system, Mini games like Space Winter Rush, Interactive activities, Educational animations, Read to Me text, Collect planet badges

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |
| Buy 5 Planets | $2.99 | one-time |


## Frequently asked questions

### Is Planetarium Projector free?

Planetarium Projector is free to download, with no in-app purchases.

### Is Smithsonian free?

Smithsonian is free to download, with in-app purchases available.

### Do Planetarium Projector or Smithsonian have ads?

Neither Planetarium Projector nor Smithsonian shows ads.

### Which is updated more often, Planetarium Projector or Smithsonian?

Planetarium Projector ships an update every 2 months, and Smithsonian every 3 months. Most recently, Planetarium Projector was updated on October 11, 2026 and Smithsonian on October 9, 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.*