# 3D Solar System vs RPN 50g

The clearest difference is review sentiment: RPN 50g at 100% against 3D Solar System's 29%. RPN 50g also leads on rating (5.0 vs 4.4) and in-app purchases (none vs 10). 3D Solar System's advantage is price (Free vs $5.99) and ratings volume (1.7K vs 1). On device support and iOS requirement there is nothing between them.

3D Solar System is free to download; RPN 50g costs $5.99 up front. 3D Solar System sells 10 in-app purchases, starting at $9.99 per month. RPN 50g asks for nothing beyond the download.

RPN 50g holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: 3D Solar System has 1.7K ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 29% of 3D Solar System's written reviews are positive against 100% of RPN 50g's.

3D Solar System ships an update fortnightly, RPN 50g weekly. The most recent releases landed on November 11, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | 3D Solar System | RPN 50g |
| --- | --- | --- |
| Price | **Free** | $5.99 |
| Rating | [4.4 (1.7K ratings)](https://appshunter.io/ios/app/3d-solar-system-planets-view/id983877380/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/rpn-50g/id6811794850/reviews)** |
| Number of ratings | **1.7K** | 1 |
| Positive reviews | 28.8% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Fortnightly | **Weekly** |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 353 MB | 30 MB |
| Requires iOS | 16.0 | 16.0 |
| Devices | iPhone, iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Education Terra](https://appshunter.io/developer/946819038) | [Guglielmo Pasa](https://appshunter.io/developer/417854438) |

## What reviewers say

### 3D Solar System

[App page](https://appshunter.io/ios/app/3d-solar-system-planets-view/id983877380)

Explore the cosmos with an interactive 3D model of the solar system and a detailed star map. Learn about planets, constellations, and celestial bodies through engaging quizzes and AI-powered planet creation. Discover the universe from your device.

**Highlights:** 3D Solar System model, Interactive star map, Constellation learning, Knowledge quizzes, AI planet generator, Augmented Reality (AR) view

**Features:** macOS Compatibility

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Month PRO | $9.99 | per month |
| 1 month Sale | $10.99 | per month |
| 12 months sale | $14.99 | per year |
| Astronomy guide - Sky atlas | $19.99 | per month |
| Astronomy guide - Sky atlas | $29.99 | per 3 months |
| 2 Month Subscription | $39.99 | per 2 months |
| 2 Months Subscription | $39.99 | per 2 months |
| 12 months | $69.99 | per year |
| Disable Ads Sale | $9.99 | one-time |
| Disable Ads | $19.99 | one-time |

**What reviewers like**

- 🌟 Informative and educational
- 🔍 Detailed solar system information
- 🎨 Cool visuals and graphics

**What reviewers complain about**

- 💰 Expensive subscription model
- 🔒 Difficult to cancel subscription
- 🤔 Misleading 'free' claims
- 🐛 Bugs and glitches
- 🤯 Confusing user interface

**Reported bugs**

- Planets displayed incorrectly
- Subscription charges without consent
- Inability to cancel subscription

**Requested features**

- More free content and features
- Realistic planet models and animations
- Expanded content beyond the solar system
- Improved accessibility and usability


### RPN 50g

[App page](https://appshunter.io/ios/app/rpn-50g/id6811794850)

This app emulates the powerful HP 50g graphing calculator, bringing its advanced features for engineering, physics, and mathematics to your mobile device. It replicates the original hardware and firmware, offering a complete RPN and RPL calculator experience with extensive graphing and programming capabilities.

**Highlights:** Advanced computer algebra system, Full scientific calculator functions, 2D and 3D graphing capabilities, RPL and UserRPL programming, Equation Library with over 300 equations, RPN or algebraic entry modes, SD card file integration

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is 3D Solar System free?

3D Solar System is free to download, with in-app purchases available.

### Is RPN 50g free?

RPN 50g costs $5.99, with no in-app purchases.

### Which has better reviews, 3D Solar System or RPN 50g?

RPN 50g is rated higher. 3D Solar System averages 4.4 out of 5 from 1.7K ratings, while RPN 50g averages 5.0 from 1 ratings.

### Do 3D Solar System or RPN 50g have ads?

3D Solar System shows ads; RPN 50g does not.

### Which is updated more often, 3D Solar System or RPN 50g?

3D Solar System ships an update fortnightly, and RPN 50g weekly. Most recently, 3D Solar System was updated on November 11, 2026 and RPN 50g on November 10, 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.*