Comparison

Electrical Formulator vs CircuitShepherd

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

Head to head
About

Electrical Formulator

This app provides a comprehensive suite of electrical calculation tools for design and engineering challenges. It offers hundreds of conversion and calculation options, with features to save, print, and email results. Easily access frequently used and recently accessed formulas, with all calculations automatically stored.

Highlights
  • Over 100 electrical formulas
  • Save and organize results
  • Share results via email or print
  • Access most-used and recent formulas
  • Supports US/Imperial and metric units
  • Formula categories for batteries, motors, transformers, and more
Features
Read full description

Electrical Formulator: Your Complete Electrical Calculation Tool Solve virtually any electrical design or engineering challenge with this powerful and intuitive electrical formulator. Packed with hundreds of conversion and calculation tools, it’s the most versatile utility in your toolkit. Save, print, or email your results. Easily access your most-used and recently used formulas. Every calculation is automatically saved for future reference. Key Features: • Instant access to over 100 professional-grade electrical formulas • Save and organize your results for later reference • Share results via email or print • Highlights your most-used and recent formulas • Designed for engineers, electricians, and energy professionals Formula Categories: Batteries • Starting motor amperage • Number of cells required • Estimated operating time Cost Calculations • Appliance and lighting energy usage • Estimated usage hours for new bulbs • Insulation payback period BTU Conversions • BTU to joules, horsepower-hr, watt-hr, calories, foot-pounds, and more Generator Calculations • DC generator output • Generator amperage and efficiency Impedance & Reactance • Resistance & reactance combinations • Inductive and capacitive reactance • Total impedance and parallel circuits Kilowatts & Joules • Convert kilowatts to BTU/hr, joules/sec, lumens, horsepower, megajoules/hr, and more Motors • Single- and three-phase motor calculations • Locked rotor current • Motor kVA (including multiple input scenarios) • Motor speed analysis Ohm’s Law • Calculate for power, voltage, resistance, or current Transformers • Primary and secondary amperage • Full-load transformer sizing (208V, 240V, 480V for single and three-phase) • Impedance and amperage capacity calculations Voltage Drop • Copper and aluminum wire voltage drop (1-phase and 3-phase) • US/Imperial and metric units supported Wiring & Conduits • Wire size and resistance (copper and aluminum) • Wire length calculations • Conduit sizing Whether you’re working in the field, the lab, or the classroom, this electrical formulator helps you work faster, smarter, and with confidence. Users are able to calculate twelve formulas for FREE. Purchase a subscription to calculate additional formulas. All subscriptions come with a 1-WEEK FREE TRIAL and SUPPORT Family Sharing.

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

Screenshots

Electrical Formulator4 screens
CircuitShepherd4 screens

Verdict

The call

The clearest difference is rating: Electrical Formulator at 5.0 against CircuitShepherd's 1.5. Electrical Formulator also leads on review sentiment (15% vs 0%). CircuitShepherd's advantage is update cadence (every 3 weeks vs every 2 months) and iOS requirement (14.0 vs 18.4). On price, ratings volume, ads and in-app purchases 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. Electrical Formulator sells 1 one-off in-app purchase and CircuitShepherd sells 1 in-app purchase, starting at $6.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Electrical Formulator holds the better App Store score, 5.0 against 1.5. Both are backed by a comparable volume of ratings — 1 and 2 respectively. Written reviews point the same way: 15% of Electrical Formulator's written reviews are positive against 0% of CircuitShepherd's.

UpkeepUpdate frequency

Electrical Formulator ships an update every 2 months, CircuitShepherd every 3 weeks. The most recent releases landed on October 6, 2026 and October 2, 2026 respectively.

Scorecard4 real differences · 6 level
Electrical Formulator versus CircuitShepherd: the parameters behind the verdict, then further details
ParameterElectrical FormulatorCircuitShepherd
PriceFreeFree
Rating5.0 (1 ratings) — better1.5 (2 ratings)
Positive reviews15.2% of reviews — better0.0% of reviews
Number of ratings12 — better
Update frequencyEvery 2 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesYesYes
MonetizationFreemiumFree with in-app purchases
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS18.414.0 — better
Further details — not scored
Size16 MB49 MB
Age rating4+4+
DeveloperHistorycentral.comJosef Woess

Customer experience

Electrical Formulator

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews33 reviews
Positive15.2%
Neutral9.1%
Negative75.8%

CircuitShepherd

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

In-app purchases

1 purchases

Electrical Formulator

One-time1
  • Pro Features For Electrcial$1.99
1 purchases

CircuitShepherd

Subscriptions1
  • full version$6.991 Month

Questions

Is Electrical Formulator free?
Electrical Formulator is free to download, with in-app purchases available.
Is CircuitShepherd free?
CircuitShepherd is free to download, with in-app purchases available.
Which has better reviews, Electrical Formulator or CircuitShepherd?
Electrical Formulator is rated higher. Electrical Formulator averages 5.0 out of 5 from 1 ratings, while CircuitShepherd averages 1.5 from 2 ratings.
Do Electrical Formulator or CircuitShepherd have ads?
Neither Electrical Formulator nor CircuitShepherd shows ads.
Which is updated more often, Electrical Formulator or CircuitShepherd?
Electrical Formulator ships an update every 2 months, and CircuitShepherd every 3 weeks. Most recently, Electrical Formulator was updated on October 6, 2026 and CircuitShepherd on October 2, 2026.

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