Four vs Circuitry
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Four
Explore the inner workings of a four-stroke Otto engine through interactive 3D animations. This app offers an engaging way to learn about automotive technology with features like rotation, zooming, and predefined views. It's designed for students but enjoyable for all ages, with multilingual support and VR capabilities.
- Interactive 3D engine model
- Rotate, zoom, and pan views
- Predefined navigation angles
- Multilingual support
- VR mode compatibility
- Built-in animations and narrations
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Four-stroke Otto engine This animation demonstrates the type of engine most commonly used in cars. Explore technology with our interactive 3D animations! Be actively involved in learning about technology by following the latest results of 3D animation. Our 3D scenes have been designed for students between 8 and 18 years of age but can be interesting for everyone. Available languages: English, Deutsch, Français, Español, Русский, العربية, 日本語, 中文, 한국어, Italiano, Português, Svenska, Nederlands, Norsk, Polski, Magyar, Türkçe, Română. With the mozaik3D App, available in the AppStore, you can access more than 1200 similar 3D scenes. Mozaik Interactive 3D Our fully interactive scenes can be rotated, enlarged or viewed from pre-set angles. With the predefined views, you can easily navigate through the complex scenes. Some of the 3D scenes contain a Walk mode, enabling you to explore the scene yourself. Most of our 3D scenes include narrations and built-in animations. They also contain captions, entertaining animated quizzes and other visual elements. The 3D scenes are available in several languages, which also offers an opportunity to learn and practice foreign languages. Usage and navigation Rotate the scene by dragging your finger. Zoom the scene in or out by pinching with your fingers. Pan the view by dragging with three fingers. Tap the buttons at the bottom to switch between predefined views. You can change the language and set other functions in the context menu. The context menu can be accessed by touching the bottom corners. Activate VR mode by pressing the VR goggles icon in the bottom right corner. In VR mode, tilt your head to right or left display the navigation panel.
Circuitry
Build and simulate electronic circuits in an intuitive 3D environment. This app offers lightning-fast analysis and a user-friendly interface, making complex engineering accessible. Circuits are saved as documents for easy sharing and management across devices.
- 3D circuit building
- GPU-accelerated analysis
- Intuitive 3D interface
- Document-based circuit files
- Component placement and connection
- Resistor, voltage source, light bulb components
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Welcome to Circuitry - the world's first and only 3D circuit builder! INSANELY FAST Circuitry uses an optimized, GPU-accelerated network analysis algorithm that will blow your mind. It can calculate the voltages and currents of even the largest circuits in the blink of an eye - an insanely fast blinking eye! SUPER DUPER EASY TO USE While most circuit simulators are stuck in the stone age when it comes to usability, Circuitry takes you on a time-travel journey to the future. Its' 3D interface and intuitive controls will instantly feel familiar - no lengthy tutorials required. DOCUMENT-BASED Every circuit you build in Circuitry is a file. That way, they integrate perfectly into your existing files and can be used exactly the same way: you can duplicate and modify them, share them, and they are available to you on all your devices. HOW TO USE: 1. Place components by dragging from the toolkit to the canvas. 2. Connect components by tapping the sides of the components in cabling mode. 3. Delete or modify components by long pressing on them. AVAILABLE COMPONENTS: - Resistor - Voltage source - Light bulb
Screenshots
Verdict
The clearest difference is rating: Four at 4.7 against Circuitry's 3.9. Four also leads on review sentiment (92% vs 51%) and iOS requirement (8.0 vs 12.0). On price, ratings volume, update cadence and ads 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Four holds the better App Store score, 4.7 against 3.9. Both are backed by a comparable volume of ratings — 89 and 156 respectively. Written reviews point the same way: 92% of Four's written reviews are positive against 51% of Circuitry's.
Four ships an update every 7 months, Circuitry every 4 months. The most recent releases landed on October 15, 2026 and October 21, 2026 respectively.
| Parameter | Four | Circuitry |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (89 ratings) — better | 3.9 (156 ratings) |
| Positive reviews | 92.0% of reviews — better | 51.4% of reviews |
| Number of ratings | 89 | 156 — better |
| Update frequency | Every 7 months | Every 4 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 8.0 — better | 12.0 |
| Further details — not scored | ||
| Size | 183 MB | 35 MB |
| Age rating | 4+ | 4+ |
| Developer | MOZAIK Education Ltd. | Raffael Kaehn |
Customer experience
Four
Circuitry
Bugs and requests
Four
Not enough reviews yet to summarise bugs or requests.
Circuitry
Reported bugs
6 issues- App crashes on launch
- App doesn't work after download
- Blank white screen on opening
- App won't open, only shows a folder
- Lights won't turn on
Show 1 moreShow fewer
- Cannot close circuits properly
Requested features
14 requests- Add more components (diodes, transistors, capacitors, inductors, speakers, microphones, resistors, switches, LEDs, displays, transformers)
- Add labels/names for components
- Add intensity and voltage for cables
- Add undo/redo buttons
- Add tutorials or guidance videos
Show 9 moreShow fewer
- Allow moving placed components
- Add polarity for components
- Add graphical representation of current flow
- Add export of 2D schematic
- Support DC and AC circuits
- Allow use of virtual meters
- Add oscilloscope function (graph vs time)
- Improve UI intuitiveness
- Add sample circuits
In-app purchases
Four
No in-app purchases
Circuitry
No in-app purchases
Questions
Is Four free?
Is Circuitry free?
Which has better reviews, Four or Circuitry?
Do Four or Circuitry have ads?
Which is updated more often, Four or Circuitry?
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