ISS Online vs Electro Sim
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ISS Online
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.
- Live HD camera stream
- ISS location tracking
- Crew member information
- Virtual station tour
- Official ISS Twitter feed
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The application is useful to all who are interested in life on the international space station. Functions: - Live HD camera - a beautiful HD video streaming of our planet - ISS Tracker: speed, altitude, coordinates, time until sunrise/sunset - ISS Crew - ISS Virtual tour - ISS Twitter
Electro Sim
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.
- 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
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Build a circuit. See current flow. Understand how it works. Electro Sim turns electronics into something you can explore on your iPhone or iPad. Place components, connect wires, and run a simulation to see how your circuit responds. Whether you are learning the basics, preparing a classroom demonstration, or testing an idea, start with a working example or build your own. BUILD ON A CANVAS OR A BREADBOARD Create schematic circuits with drag-and-drop components and flexible wiring, or try a virtual breadboard with components and jumper wires. Zoom in to make connections, rotate parts, and use undo and redo as you experiment. SEE WHAT CHANGES WHEN YOU CHANGE THE CIRCUIT Follow animated current flow, inspect voltage and current readings, and use a virtual multimeter to explore circuit behavior. Adjust component values, toggle switches, or advance the simulation one step at a time to connect cause and effect. LEARN THROUGH WORKING EXAMPLES Explore LED circuits, capacitor charging, logic gates, adders, counters, seven-segment displays, and traffic lights. Selected examples include guided steps that help you investigate the circuit and check your understanding. FIND THE PARTS YOU NEED Browse a searchable component library with resistors, capacitors, inductors, diodes, LEDs, transistors, switches, buzzers, logic gates, and signal sources. Component descriptions and pin information help you decide what to use and how to connect it. TURN CIRCUIT BLOCKS INTO REUSABLE MODULES With Pro, create custom components from circuit blocks, define their pins, and reuse them in new projects. Build up a collection of modules as your ideas grow. Custom component creation and use require an active Pro subscription. SAVE AND SHARE YOUR WORK Save projects to revisit later, exchange circuit files in JSON format, and export circuit snapshots or PDF reports with readings and notes for learning and discussion. Designed for iPhone and iPad, with light and dark appearances and English, Simplified Chinese, and Traditional Chinese interfaces. Start with one LED, then see where your curiosity takes you.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | ISS Online | Electro Sim |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | — | 4.0 (1 ratings) — better |
| Positive reviews | 50.0% of reviews | 100.0% of reviews — better |
| Number of ratings | — | 1 — better |
| Update frequency | Every 2 months — better | Every 4 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 16.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 7 MB | 19 MB |
| Age rating | 4+ | 4+ |
| Developer | Pavel Koyushev | 剑龙 刘 |
Customer experience
ISS Online
Electro Sim
In-app purchases
ISS Online
No in-app purchases
Electro Sim
- Monthly$0.99
- Yearly$3.99
Questions
Is ISS Online free?
Is Electro Sim free?
Do ISS Online or Electro Sim have ads?
Which is updated more often, ISS Online or Electro Sim?
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