# ISS Online vs Electro Sim

The clearest difference is review sentiment: Electro Sim at 100% against ISS Online's 50%. Electro Sim also leads on price (Free vs $1.99). ISS Online's advantage is in-app purchases (none vs 2) and update cadence (every 2 months vs every 4 months). On ads, device support and iOS requirement there is nothing between them.

Electro Sim is free to download; ISS Online costs $1.99 up front. Electro Sim sells 2 one-off in-app purchases. ISS Online asks for nothing beyond the download.

ISS Online ships an update every 2 months, Electro Sim every 4 months. Both last shipped on October 22, 2026.

## The numbers

| Metric | ISS Online | Electro Sim |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | — | **[4.0 (1 ratings)](https://appshunter.io/ios/app/electro-sim/id6758049588/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 4 months |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 7 MB | 19 MB |
| Requires iOS | **16.0** | 17.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Pavel Koyushev](https://appshunter.io/developer/1257728721) | [剑龙 刘](https://appshunter.io/developer/562718731) |

## What reviewers say

### ISS Online

[App page](https://appshunter.io/ios/app/iss-online/id1434652920)

Explore life aboard the International Space Station with live HD video streams of Earth. Track the station's position, view crew information, and take a virtual tour. Stay updated on ISS activities and its Twitter feed.

**Highlights:** Live HD camera stream, ISS location tracking, Crew member information, Virtual station tour, Official ISS Twitter feed

**Features:** macOS Compatibility

**In-app purchases:** none


### Electro Sim

[App page](https://appshunter.io/ios/app/electro-sim/id6758049588)

Learn and teach basic electronics with an intuitive circuit simulator. Drag, wire, and combine components on a real-time canvas to visualize current flow and understand DC circuit concepts.

**Highlights:** Intuitive drag-and-drop canvas, Real-time DC simulation with current visualization, Extensive component library with search, Build and reuse custom components, Save, load, and export circuits, Undo/redo functionality

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $0.99 | one-time |
| Yearly | $3.99 | one-time |


## Frequently asked questions

### Is ISS Online free?

ISS Online costs $1.99, with no in-app purchases.

### Is Electro Sim free?

Electro Sim is free to download, with in-app purchases available.

### Do ISS Online or Electro Sim have ads?

Neither ISS Online nor Electro Sim shows ads.

### Which is updated more often, ISS Online or Electro Sim?

ISS Online ships an update every 2 months, and Electro Sim every 4 months. Most recently, ISS Online was updated on October 22, 2026 and Electro Sim on October 22, 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.*