# SDO Viewer vs ScopeBoss

The clearest difference is rating: ScopeBoss at 4.0 against SDO Viewer's 3.0. SDO Viewer's advantage is update cadence (every 2 months vs every 33 months). On price, ratings volume, ads and in-app purchases there is nothing between them.

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

ScopeBoss holds the better App Store score, 4.0 against 3.0. Both are backed by a comparable volume of ratings — 5 and 6 respectively.

SDO Viewer ships an update every 2 months, ScopeBoss every 33 months. The most recent releases landed on June 1, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | SDO Viewer | ScopeBoss |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (5 ratings)](https://appshunter.io/ios/app/sdo-viewer/id913723111/reviews) | **[4.0 (6 ratings)](https://appshunter.io/ios/app/scopeboss/id948492188/reviews)** |
| Number of ratings | 5 | **6** |
| Positive reviews | 60.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 33 months |
| Monetization | Free | Free |
| Size | 6 MB | 19 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Jerome Diaz](https://appshunter.io/developer/334987620) | [Lodewijk Bonebakker](https://appshunter.io/developer/1714503291) |

## What reviewers say

### SDO Viewer

[App page](https://appshunter.io/ios/app/sdo-viewer/id913723111)

Access and view the latest images from the Solar Dynamics Observatory. Receive push notifications when new images become available, keeping you updated on solar activity.

**Highlights:** Download SDO images, Display latest solar images, Push notifications for new images, Courtesy of NASA/SDO science teams

**Features:** macOS Compatibility

**In-app purchases:** none


### ScopeBoss

[App page](https://appshunter.io/ios/app/scopeboss/id948492188)

Control your Meade LX200GPS telescope remotely using your iPhone or iPad. This app emulates the Autostar II controller, offering convenient access to telescope functions through intuitive tabs for slewing, object catalogs, and custom buttons.

**Highlights:** Emulates Autostar II controller, WiFi-to-Serial adapter communication, Keypad and Slew control tabs, Gesture-based slewing, Customizable function buttons, Object catalogs with over 21,000 entries, Micro focuser control

**In-app purchases:** none


## Frequently asked questions

### Is SDO Viewer free?

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

### Is ScopeBoss free?

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

### Which has better reviews, SDO Viewer or ScopeBoss?

ScopeBoss is rated higher. SDO Viewer averages 3.0 out of 5 from 5 ratings, while ScopeBoss averages 4.0 from 6 ratings.

### Do SDO Viewer or ScopeBoss have ads?

Neither SDO Viewer nor ScopeBoss shows ads.

### Which is updated more often, SDO Viewer or ScopeBoss?

SDO Viewer ships an update every 2 months, and ScopeBoss every 33 months. Most recently, SDO Viewer was updated on June 1, 2026 and ScopeBoss on September 16, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*