# Cassi Telescope Viewer vs UVB

The clearest difference is iOS requirement: UVB at 17.6 against Cassi Telescope Viewer's 26.2. On price, rating, ratings volume and update cadence there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for Cassi Telescope Viewer against 5.0 for UVB. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

Cassi Telescope Viewer ships an update every 5 days, UVB every 9 days. Both last shipped on October 24, 2026.

## The numbers

| Metric | Cassi Telescope Viewer | UVB |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/cassi-telescope-viewer/id6759762743/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/uvb-76-shortwave-buzzer/id6786464215/reviews) |
| Number of ratings | 1 | 1 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 9 days |
| Monetization | Free | — |
| Size | 1 MB | 41 MB |
| Requires iOS | 26.2 | **17.6** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Cassi Telescope LLC](https://appshunter.io/developer/1880533492) | [Maxim Oransky](https://appshunter.io/developer/1639941241) |

## What reviewers say

### Cassi Telescope Viewer

[App page](https://appshunter.io/ios/app/cassi-telescope-viewer/id6759762743)

This app simplifies telescope viewing for amateur astronomers using smartphone mounts. It corrects image orientation and aids in locating celestial objects.

**Highlights:** Smartphone mount compatibility, 360-degree image inversion, Assisted object seeking, Easy-to-use interface

**In-app purchases:** none


### UVB

[App page](https://appshunter.io/ios/app/uvb-76-shortwave-buzzer/id6786464215)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Cassi Telescope Viewer free?

Cassi Telescope Viewer is free to download, with no in-app purchases.

### Is UVB free?

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

### Which has better reviews, Cassi Telescope Viewer or UVB?

Cassi Telescope Viewer and UVB are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do Cassi Telescope Viewer or UVB have ads?

Neither Cassi Telescope Viewer nor UVB shows ads.

### Which is updated more often, Cassi Telescope Viewer or UVB?

Cassi Telescope Viewer ships an update every 5 days, and UVB every 9 days. Most recently, Cassi Telescope Viewer was updated on October 24, 2026 and UVB on October 24, 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.*