Resistor Tools vs Simple Circuit Builder
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Resistor Tools
This utility app provides a suite of tools for calculating and determining resistor values. It assists hobbyists and engineers with series, parallel, and voltage divider calculations, as well as inverting amplifier gain.
- Series and parallel resistor calculation
- Resistor combination finder
- Voltage divider ratio and value calculation
- Inverting amplifier gain calculation
- Save combinations to CSV
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This app is a collection of resistor calculators. It is suitable for hobbyist or electronic engineer. * Calculate resistance of two resistors in series or parallel * Find out combinations of two resistors in series/parallel making a desired resistance * Calculate ratio of R1/R2 and voltage divider * Find out resistor values of making voltage divider ratio * Find out resistor values of making inverting amplifier gain * Save combination values in CSV file
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.
Screenshots
Verdict
The clearest difference is rating: Resistor Tools at 5.0 against Simple Circuit Builder's 4.0. Resistor Tools also leads on review sentiment (75% vs 53%) and iOS requirement (12.0 vs 14.0). Simple Circuit Builder's advantage is in-app purchases (none vs 1) and update cadence (every 3 weeks vs every 2 months). On price, ratings volume, ads and device support 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. Resistor Tools sells 1 one-off in-app purchase. Simple Circuit Builder asks for nothing beyond the download.
Resistor Tools holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 10 and 28 respectively. Written reviews point the same way: 75% of Resistor Tools's written reviews are positive against 53% of Simple Circuit Builder's.
Resistor Tools ships an update every 2 months, Simple Circuit Builder every 3 weeks. The most recent releases landed on October 5, 2026 and September 13, 2026 respectively.
| Parameter | Resistor Tools | Simple Circuit Builder |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (10 ratings) — better | 4.0 (28 ratings) |
| Positive reviews | 75.0% of reviews — better | 52.6% of reviews |
| Number of ratings | 10 | 28 — better |
| Update frequency | Every 2 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 14.0 |
| Further details — not scored | ||
| Size | 4 MB | 14 MB |
| Age rating | 4+ | 4+ |
| Developer | Siu Yuen Ho | David White |
Customer experience
Resistor Tools
Simple Circuit Builder
In-app purchases
Resistor Tools
- Unlock pro feature$0.99
Simple Circuit Builder
No in-app purchases
Questions
Is Resistor Tools free?
Is Simple Circuit Builder free?
Which has better reviews, Resistor Tools or Simple Circuit Builder?
Do Resistor Tools or Simple Circuit Builder have ads?
Which is updated more often, Resistor Tools or Simple Circuit Builder?
Other comparisons
