Comparison

CircuitShepherd vs Resistor

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

CircuitShepherd

Automate electronic circuit design with AI-driven parameter optimization. Define schematics and design goals, and the software finds optimal part values in real-time. Save time on calculations and iterations with this intuitive tool.

Highlights
  • Automated parameter optimization
  • AI-driven circuit engineering
  • Real-time design goal finding
  • Intuitive user interface
  • Schematic definition
  • Part value calculation
Read full description

CircuitShepherd provides you with analog-design superpowers by doing automated parameter optimization it in realtime! It's a novel Electronic Design Automation software for AI driven electronics circuit engineering. You define an arbitrary schematic including specific design goals and CircuitShepherd will find the right part values for you. This is achieved by combining traditional circuit simulation techniques with AI driven parameter estimation algorithms and finally a simple and intuitive user interface. It’s easy to learn, fast to use and it will save you a lot of time by automating your daily calculation and iteration tasks. CircuitShepherd is free to use immediately (with very basic features). The full version with all features enabled is available via in-app purchase (subscription-based). Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.circuitshepherd.com/privacy-policy-iOS.html

About

Resistor

This application simplifies electronic circuit calculations with tools for series/parallel resistance, LED current limiting, and three-phase circuit conversions. It also features a resistor color code decoder for quick component identification.

Highlights
  • Series/parallel resistor calculator
  • LED series resistor calculator
  • Star-delta and delta-star converters
  • Resistor color code decoder
  • Intuitive interface
Features
Read full description

Resistor Calc is an essential tool for anyone working with electronic circuits and resistors. Designed to streamline complex calculations and provide invaluable insights, this powerful app for iOS devices is a must-have in your toolkit. At the heart of Resistor Calc lies a comprehensive suite of calculators tailored to the needs of electrical engineers, students, hobbyists, and professionals. The series/parallel calculator makes it a breeze to determine the equivalent resistance for even the most intricate circuit configurations, eliminating the need for tedious manual calculations prone to errors. The LED series resistor calculator is a game-changer for those working with LED lighting systems. Simply input the required parameters, and Resistor Calc will recommend the ideal resistor value to ensure proper current limiting and protect your LEDs from potential damage, ensuring optimal performance and longevity. For three-phase circuits, the app's star-delta and delta-star converters streamline the process of switching between different wiring configurations. Whether you need to convert from star to delta or vice versa, Resistor Calc has you covered, saving you valuable time and effort. But the true standout feature of Resistor Calc is its powerful resistor color code decoder. Never again will you need to decipher those tiny colored bands manually. Simply input the color codes, and the app will instantly reveal the resistor's value, tolerance, and other essential information, making component identification a breeze and saving you countless hours of frustration. With its sleek and intuitive interface, Resistor Calc is designed for seamless navigation and ease of use. Whether you're a student grappling with complex circuit problems or a seasoned professional tackling intricate projects, this app empowers you with accurate and reliable calculations at your fingertips. Download Resistor Calc today and experience the power of efficient circuit analysis and resistor management on your iOS device. Streamline your workflow, minimize errors, and unlock new levels of productivity in your electrical engineering endeavours.

Screenshots

CircuitShepherd4 screens
Resistor4 screens

Verdict

The call

The clearest difference is review sentiment: Resistor at 50% against CircuitShepherd's 0%. Resistor also leads on rating (3.0 vs 1.5) and in-app purchases (none vs 1). CircuitShepherd's advantage is ads (none vs shown) and update cadence (every 3 weeks vs every 16 months). On price, ratings volume, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. CircuitShepherd sells 1 in-app purchase, starting at $6.99 per month. Resistor asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Resistor holds the better App Store score, 3.0 against 1.5. Both are backed by a comparable volume of ratings — 2 and 3 respectively. Written reviews point the same way: 0% of CircuitShepherd's written reviews are positive against 50% of Resistor's.

UpkeepUpdate frequency

CircuitShepherd ships an update every 3 weeks, Resistor every 16 months. The most recent releases landed on June 4, 2026 and September 9, 2026 respectively.

Scorecard6 real differences · 4 level
CircuitShepherd versus Resistor: the parameters behind the verdict, then further details
ParameterCircuitShepherdResistor
PriceFreeFree
Rating1.5 (2 ratings)3.0 (3 ratings) — better
Positive reviews0.0% of reviews50.0% of reviews — better
Number of ratings23 — better
Update frequencyEvery 3 weeks — betterEvery 16 months
AdsNo — betterYes
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesAd-supported — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS14.013.0 — better
Further details — not scored
Size49 MB22 MB
Age rating4+4+
DeveloperJosef WoessAnas Abubakar

Customer experience

CircuitShepherd

All ratings2 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

Resistor

All ratings3 ratings
Positive33.3%
Neutral33.3%
Negative33.3%
Written reviews2 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

In-app purchases

1 purchases

CircuitShepherd

Subscriptions1
  • full version$6.991 Month
None

Resistor

No in-app purchases

Questions

Is CircuitShepherd free?
CircuitShepherd is free to download, with in-app purchases available.
Is Resistor free?
Resistor is free to download, with no in-app purchases.
Which has better reviews, CircuitShepherd or Resistor?
Resistor is rated higher. CircuitShepherd averages 1.5 out of 5 from 2 ratings, while Resistor averages 3.0 from 3 ratings.
Do CircuitShepherd or Resistor have ads?
Resistor shows ads; CircuitShepherd does not.
Which is updated more often, CircuitShepherd or Resistor?
CircuitShepherd ships an update every 3 weeks, and Resistor every 16 months. Most recently, CircuitShepherd was updated on June 4, 2026 and Resistor on September 9, 2026.

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