# SolarViewer vs Tousek TST100

The clearest difference is update cadence: SolarViewer at every 5 weeks against Tousek TST100's every 4 months. SolarViewer also leads on iOS requirement (8.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

SolarViewer ships an update every 5 weeks, Tousek TST100 every 4 months. The most recent releases landed on October 7, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | SolarViewer | Tousek TST100 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 4 months |
| Size | 36 MB | 36 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [AsianPowerDevicesInc](https://appshunter.io/developer/1214788661) | [tousek Ges.m.b.H](https://appshunter.io/developer/1599726875) |

## What reviewers say

### SolarViewer

[App page](https://appshunter.io/ios/app/solarviewer/id1462404751)

**Features:** macOS Compatibility

**In-app purchases:** none


### Tousek TST100

[App page](https://appshunter.io/ios/app/tousek-tst100/id6448426822)

**In-app purchases:** none


## Frequently asked questions

### Is SolarViewer free?

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

### Is Tousek TST100 free?

Tousek TST100 is free to download, with no in-app purchases.

### Do SolarViewer or Tousek TST100 have ads?

Neither SolarViewer nor Tousek TST100 shows ads.

### Which is updated more often, SolarViewer or Tousek TST100?

SolarViewer ships an update every 5 weeks, and Tousek TST100 every 4 months. Most recently, SolarViewer was updated on October 7, 2026 and Tousek TST100 on October 15, 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.*