Simple Circuit Builder vs Cassette Air
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Simple Circuit Builder
This virtual lab offers a hands-on experience for learning about resistors and circuit resistance. Easily build and test series and parallel circuits, measure voltage and current, and understand the impact of component changes in real-time.
- Build circuits with up to eight components
- Five component types
- Virtual volt and amp meters
- Adjustable resistor and voltage values
- Real-time circuit analysis
- Demonstrates 'Opens' and 'Shorts'
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Description This is the BEST app to learn about Resistors and Circuit Resistance (Equivalent Resistance). This virtual lab provides an excellent environment for anyone who is interested in understanding series and parallel resistors, learning how to measure voltages across resistors, current through series and parallel circuits and solving simple circuits. Features - VERY SIMPLE and EASY TO USE, with up to eight component sections. - Component sections can easily be configured from five different types. - VIRTUAL "Hands On" experience using volt and amp meters. - Resistor values can easily be changed with a picker, keypad or using randomize button. - Circuit voltage can easily be changed from 1 to 1000 volts with a picker or a keypad. - The "Basics" screen make this app unique for the simplicity and speed of seeing the effects of "Opens" (resistor component with infinite resistance) and "Shorts" (resistor component with zero resistance). - FREE and NO ADVERTISEMENTS. - The circuit is always "LIVE" and immediately shows voltage, current and circuit resistance with any changes made to the circuit.
Cassette Air
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Cassette Air — Local Audio & Video Player Play local music and video on iPhone — no streaming, no subscription, no account needed. Cassette Air is a powerful local media player for iPhone. Import and play any audio or video file stored on your device. Clean interface, professional playback, complete privacy. Audio & Video Player Play MP3, AAC, FLAC, WAV, M4A, MP4, MOV, MKV and more. Background playback, lock screen controls, AirPlay, sleep timer and playback speed control included. Import & Manage Files Import from Files, Photos or Apple Music. Open any file from another app instantly. Automatic metadata, artwork and smart library included. Audio Extractor Extract audio from any video file. Save as MP3 or M4A — high quality, no loss. Offline & Private No account. No cloud. No analytics. Your files stay on your device. Always. Support: mohcinebadour@gmail.com
Screenshots
Verdict
The clearest difference is ads: Simple Circuit Builder at none against Cassette Air's shown. Simple Circuit Builder also leads on update cadence (every 3 weeks vs every 2 months). On price, in-app purchases, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Simple Circuit Builder ships an update every 3 weeks, Cassette Air every 2 months. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.
| Parameter | Simple Circuit Builder | Cassette Air |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (28 ratings) — better | — |
| Positive reviews | 52.6% of reviews | — |
| Number of ratings | 28 — better | — |
| Update frequency | Every 3 weeks — better | Every 2 months |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 14.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 14 MB | 46 MB |
| Age rating | 4+ | 12+ |
| Developer | David White | mohcine badour |
In-app purchases
Simple Circuit Builder
No in-app purchases
Cassette Air
No in-app purchases
Questions
Is Simple Circuit Builder free?
Is Cassette Air free?
Do Simple Circuit Builder or Cassette Air have ads?
Which is updated more often, Simple Circuit Builder or Cassette Air?
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