# Solar System Viewer vs Speech Math

The clearest difference is in-app purchases: Speech Math at none against Solar System Viewer's 4. Speech Math also leads on price ($0.99 vs $2.99) and iOS requirement (13.0 vs 26.0). Solar System Viewer's advantage is update cadence (every 2 months vs every 10 months). On ads and device support there is nothing between them.

Solar System Viewer costs $2.99 and Speech Math $0.99 up front. Solar System Viewer sells 4 one-off in-app purchases. Speech Math asks for nothing beyond the download.

Solar System Viewer ships an update every 2 months, Speech Math every 10 months. The most recent releases landed on October 5, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Solar System Viewer | Speech Math |
| --- | --- | --- |
| Price | $2.99 | **$0.99** |
| Rating | **[4.4 (28 ratings)](https://appshunter.io/ios/app/solar-system-viewer-8planets/id1554639445/reviews)** | — |
| Number of ratings | **28** | — |
| Positive reviews | 83.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 10 months |
| Monetization | Paid | — |
| Size | 22 MB | 1 MB |
| Requires iOS | 26.0 | **13.0** |
| Devices | **iPhone, iPad, Mac, Apple Watch** | iPhone, iPod, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [BLUE COMET LABS LLC](https://appshunter.io/developer/1492055170) | [kim juyoung](https://appshunter.io/developer/918406157) |

## What reviewers say

### Solar System Viewer

[App page](https://appshunter.io/ios/app/solar-system-viewer-8planets/id1554639445)

Explore and simulate the orbits of planets in our solar system. This app allows you to speed up or slow down time, travel to any date, and view planetary positions. It also offers widgets for your home screen and Apple Watch complications.

**Highlights:** Simulate planetary orbits, Adjust time speed, Time travel to specific dates, Home screen widgets, Apple Watch integration, View planet overviews

**Features:** Apple Watch app, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Io Tip | $1.99 | one-time |
| Europa Tip | $3.99 | one-time |
| Ganymede Tip | $5.99 | one-time |
| Callisto Tip | $9.99 | one-time |


### Speech Math

[App page](https://appshunter.io/ios/app/speech-math/id6450673499)

**In-app purchases:** none


## Frequently asked questions

### Is Solar System Viewer free?

Solar System Viewer costs $2.99, and also offers in-app purchases.

### Is Speech Math free?

Speech Math costs $0.99, with no in-app purchases.

### Do Solar System Viewer or Speech Math have ads?

Neither Solar System Viewer nor Speech Math shows ads.

### Which is updated more often, Solar System Viewer or Speech Math?

Solar System Viewer ships an update every 2 months, and Speech Math every 10 months. Most recently, Solar System Viewer was updated on October 5, 2026 and Speech Math 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.*