Simple Circuit Builder vs LT Service
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.
LT Service
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LT Service enables users to easily monitor data and issue fault warnings for inkjet printers on their mobile phones. For example, within the app, users can view device status anytime and anywhere (such as normal operation, fault shutdown, waiting for maintenance and other machine information), keep track of the latest developments on the production line, and push real-time machine abnormal information (such as consumables empty prompt, fault shutdown prompt, multiple warning setting message real-time push function, etc.), so that users can obtain messages in a timely manner to reduce downtime. It can also deeply analyze device data, provide optimization suggestions, and improve production efficiency.
Screenshots
Verdict
The clearest difference is update cadence: Simple Circuit Builder at every 3 weeks against LT Service's every 7 months. LT Service's advantage is iOS requirement (12.0 vs 14.0). On price, ads, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
Simple Circuit Builder ships an update every 3 weeks, LT Service every 7 months. The most recent releases landed on September 13, 2026 and September 19, 2026 respectively.
| Parameter | Simple Circuit Builder | LT Service |
|---|---|---|
| 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 7 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 14.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 14 MB | 33 MB |
| Age rating | 4+ | 4+ |
| Developer | David White | 领达电子科技(珠海)有限公司 |
In-app purchases
Simple Circuit Builder
No in-app purchases
LT Service
No in-app purchases
Questions
Is Simple Circuit Builder free?
Is LT Service free?
Do Simple Circuit Builder or LT Service have ads?
Which is updated more often, Simple Circuit Builder or LT Service?
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