# Speech Math vs Solar System Clock

The clearest difference is price: Solar System Clock at Free against Speech Math's $0.99. Solar System Clock also leads on update cadence (every 2 days vs every 10 months). Speech Math's advantage is iOS requirement (13.0 vs 16.6). On ads, in-app purchases and device support there is nothing between them.

Solar System Clock is free to download; Speech Math costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Speech Math ships an update every 10 months, Solar System Clock every 2 days. The most recent releases landed on September 20, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Speech Math | Solar System Clock |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 2 days** |
| Size | 1 MB | 5 MB |
| Requires iOS | **13.0** | 16.6 |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [kim juyoung](https://appshunter.io/developer/918406157) | [Mateusz Andrzejczuk](https://appshunter.io/developer/1158375886) |

## What reviewers say

### Speech Math

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

**In-app purchases:** none


### Solar System Clock

[App page](https://appshunter.io/ios/app/solar-system-clock/id6746730661)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Speech Math free?

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

### Is Solar System Clock free?

Solar System Clock is free to download, with no in-app purchases.

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

Neither Speech Math nor Solar System Clock shows ads.

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

Speech Math ships an update every 10 months, and Solar System Clock every 2 days. Most recently, Speech Math was updated on September 20, 2026 and Solar System Clock 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.*