# SDO Viewer vs Electronics Circuit Simulator

The clearest difference is price: SDO Viewer at Free against Electronics Circuit Simulator's $2.99. SDO Viewer also leads on iOS requirement (13.0 vs 17.0). Electronics Circuit Simulator's advantage is update cadence (monthly vs every 2 months). On ads, in-app purchases and device support there is nothing between them.

SDO Viewer is free to download; Electronics Circuit Simulator costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

SDO Viewer ships an update every 2 months, Electronics Circuit Simulator monthly. The most recent releases landed on November 6, 2026 and November 11, 2026 respectively.

## The numbers

| Metric | SDO Viewer | Electronics Circuit Simulator |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | **[2.7 (6 ratings)](https://appshunter.io/ios/app/sdo-viewer/id913723111/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 60.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | Free | — |
| Size | 6 MB | 5 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Jérôme Diaz](https://appshunter.io/developer/334987620) | [Yuhsiu Lai](https://appshunter.io/developer/433114647) |

## 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


### Electronics Circuit Simulator

[App page](https://appshunter.io/ios/app/electronics-circuit-simulator/id6762292048)

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

**In-app purchases:** none


## Frequently asked questions

### Is SDO Viewer free?

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

### Is Electronics Circuit Simulator free?

Electronics Circuit Simulator costs $2.99, with no in-app purchases.

### Do SDO Viewer or Electronics Circuit Simulator have ads?

Neither SDO Viewer nor Electronics Circuit Simulator shows ads.

### Which is updated more often, SDO Viewer or Electronics Circuit Simulator?

SDO Viewer ships an update every 2 months, and Electronics Circuit Simulator monthly. Most recently, SDO Viewer was updated on November 6, 2026 and Electronics Circuit Simulator on November 11, 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.*