iCircuit vs LogMaster
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
iCircuit
Design and simulate analog and digital electronic circuits in real-time. This app offers a comprehensive component library, built-in test equipment, and the ability to create custom elements. It's ideal for learning, prototyping, and validating designs without physical components.
- Real-time circuit simulation
- Extensive component library (300+)
- Built-in test equipment (multimeter, oscilloscope)
- Programmable Arduino and PIC microcontroller support
- Custom element creation and sharing
- Audio simulation
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iCircuit is the premier iPhone and iPad app for designing, simulating, and learning analog and digital electronics. Its advanced simulation engine provides real-time, always-on analysis so your circuits stay powered and live, just like working with real components. Use it like a CAD tool: add components, wire them up, and set their properties. But iCircuit is unlike typical CAD apps because it is always simulating. You do not stop to take a measurement or spend time configuring reports. Instead, you just play with the circuit as you normally would, with the power on. Build circuits with over 300 components, from simple resistors and LEDs to programmable Arduinos (Uno, Nano, Mega, ESP8266, ESP32), PIC microcontrollers, and 60 4000/7400-series digital ICs (more available with Pro). Connect elements, adjust values, and instantly see the results. BUILT-IN TEST EQUIPMENT • Multimeter: Probe any point to read voltage, current, and power • Oscilloscope: Track multiple signals with touch-controlled time scale, stacked/unstacked views, FFT analysis, and Bode plots • Gauges: Visualize voltages, currents, and frequencies directly in your circuit • Signal generators and configurable sources EXTENSIVE COMPONENT LIBRARY • Programmable Arduinos (Uno, Nano, Mega, ESP8266, ESP32) • Programmable PIC microcontrollers (assembly and HEX files, more available with Pro) • Power: Voltage regulators (78xx, LM317), sources, dependent sources, power jacks, and simulated antennas • Analog: Resistors, capacitors, inductors, diodes, BJTs, MOSFETs, thermistors, triodes, and tetrodes • Digital: Logic gates (AND, OR, NAND, NOR, XOR), JK and D flip-flops, and 60 4000/7400-series ICs (180+ available with Pro) • ADCs and DACs • Sensors and displays: LEDs, 7-segment, NeoPixels, matrix displays, thermistors • Electromechanical: Motors, servos, SPST/SPDT and DPST/DPDT switches, push buttons, relays, and speakers CREATE CUSTOM ELEMENTS Build sub-circuits and custom elements to componentize your designs and create reusable modules. Share your custom elements with others via the iCircuit Gallery. AUDIO SIMULATION Hear your circuits. Speakers, buzzers, and microphones produce real audio output. Perfect for students learning electronics, hobbyists prototyping projects, and engineers validating designs, all without burning out a single component. ABOUT ICIRCUIT PRO (OPTIONAL) iCircuit is a complete app with a one-time purchase. iCircuit Pro is optional and adds extra components (including more PICs and a larger 4000/7400 IC library) and helps fund ongoing development. Pro is not required for core simulation or everyday circuit design. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
LogMaster
Instantly measure logs and get optimal cutting solutions using LiDAR technology. Reduce waste and improve lumber quality for portable sawmills. Works offline and keeps all data on your device.
- LiDAR log scanning
- Instant cutting solutions
- Optimized lumber yield
- Offline operation
- Data stays on device
- Portable sawmill focus
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Scan a log on your portable sawmill, have a cutting solution produced instantly. LogMaster uses the iPhone (or iPad) LiDAR system to measure logs and calculate an optimal cutting solution specific to your defined sawmill. Less waste, more lumber. No more off-size cuts and mountains of re-saw. Do it once, do it correctly. Become a Log Master today! Your sawmill efficiency will sky rocket, and you will produce more quality boards than ever before. BUILT FOR THE FIELD Log Master is designed to work where you work — outdoors, on the landing, at the mill, or in the bush. Scans complete in seconds. No internet connection required. All data stays on your device. WHO IT'S FOR LogMaster is built for portable sawmill operators, small and mid-sized sawmill businesses, woodlot owners, log buyers, and anyone who needs fast, reliable log measurement without a tape measure and a scaling stick, or anyone who wants a decent output estimate from a log almost instantly. LogMaster pairs with LogScanner - field scans can move between devices to reach the Sawyer. LogMaster is an advanced sawing consultant: it analyzes logs for the best lumber output and builds a cut plan to do it. REQUIREMENTS LogMaster requires an iPhone 12 Pro or later with a LiDAR Scanner. Compatible with iPhone 12 Pro, 12 Pro Max, 13 Pro, 13 Pro Max, 14 Pro, 14 Pro Max, 15 Pro, 15 Pro Max, and later Pro models. SUBSCRIPTION LogMaster is available as a monthly or annual subscription. Subscriptions are managed through your Apple ID. Cancel any time. IMPORTANT Log measurements are estimates based on LiDAR sensor data and are intended as decision-support tools. Results may vary based on scanning conditions, log surface, and device. LogMaster is not a certified scaling instrument and does not satisfy legal scaling requirements where applicable. Terms of Use: https://www.bunyansoftware.com/eula Privacy Policy: https://www.bunyansoftware.com/privacy
Screenshots
Verdict
The clearest difference is price: LogMaster at Free against iCircuit's $12.99. LogMaster also leads on rating (5.0 vs 3.8) and review sentiment (100% vs 61%). iCircuit's advantage is ratings volume (134 vs 2) and iOS requirement (12.2 vs 17.0). On 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
LogMaster is free to download; iCircuit costs $12.99 up front. iCircuit sells 2 in-app purchases, starting at $1.99 per month and LogMaster sells 3 in-app purchases, starting at $14.99 per month. Whichever you choose, the download price is not the number that matters.
LogMaster holds the better App Store score, 5.0 against 3.8. That said, the two scores are not equally well evidenced: iCircuit has 134 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 61% of iCircuit's written reviews are positive against 100% of LogMaster's.
iCircuit ships an update every 3 weeks, LogMaster weekly. The most recent releases landed on September 30, 2026 and September 21, 2026 respectively.
| Parameter | iCircuit | LogMaster |
|---|---|---|
| Price | $12.99 | Free — better |
| Rating | 3.8 (134 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 61.1% of reviews | 100.0% of reviews — better |
| Number of ratings | 134 — better | 2 |
| Update frequency | Every 3 weeks | Weekly — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Paid — better | Subscription |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 12.2 — better | 17.0 |
| Further details — not scored | ||
| Size | 126 MB | 47 MB |
| Age rating | 4+ | 4+ |
| Developer | Krueger Systems, Inc. | Bunyan Software |
Customer experience
iCircuit
LogMaster
Bugs and requests
iCircuit
Reported bugs
4 issues- Oscilloscope and meter functions not working properly
- Saving and loading circuits can be unreliable
- Inconsistent behavior when rotating/flipping components
- Crashes when working with larger or more complex circuits
Requested features
5 requests- More components (e.g. transformers, triodes, MOSFETs)
- Ability to create custom components
- Frequency domain analysis (Bode plots, FFT)
- Improved wiring and component placement controls
- Better support for AC circuits and motors
LogMaster
Not enough reviews yet to summarise bugs or requests.
In-app purchases
iCircuit
- iCircuit Pro (Monthly)$1.991 Month
- iCircuit Pro (Yearly)$14.991 Year
LogMaster
- Monthly$14.991 Month
- 6 Month$79.996 Months
- Annual$149.991 Year
Questions
Is iCircuit free?
Is LogMaster free?
Which has better reviews, iCircuit or LogMaster?
Do iCircuit or LogMaster have ads?
Which is updated more often, iCircuit or LogMaster?
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