Comparison

Inductor Design Pro vs Transformer Calculation Tool

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

Head to head
About

Inductor Design Pro

Read full description

Inductor Design Pro is a secure, offline-first power inductor design tool for power electronics engineers and magnetic component design workflows. Core capabilities: AP-method and LI²-method core selection, joint core-and-winding iteration, Pareto non-dominated filtering with DQS five-dimension scoring (loss, core volume, thermal margin, manufacturability, risk), and automatic multi-candidate comparison. Supports custom material / core / bobbin databases merged with the built-in library. Peak flux density B_max is optional — leave blank to auto-determine from material and operating temperature; if set manually, use values appropriate to the material family to avoid excluding viable cores too early. Topologies: Buck, Boost, Forward (output filter inductor only, not the transformer), and Interleaved Buck (multi-phase, one inductor per phase), with CCM / DCM / BCM modes and full co-evaluation of core, material, air gap, temperature rise, and losses. Parameter sweep: frequency sweep and ripple-ratio / DCM sweep charts visualize how inductance and core size vary with key parameters, helping you trade off switching frequency against core size. Workflow: three-step closed loop (Specifications & Constraints → Core & Winding Selection → Summary & Report), with PDF report and JSON design-file export. Built-in core and wire database included. Privacy & data: core design runs locally; design data stays on your device and is never uploaded to the developer’s servers. Subscription and restore purchases require a network connection. Subscription: Inductor Design Pro Annual Subscription, 1-year term, auto-renews at expiry, $29.99/year (Mainland China ¥198/year; other regions as shown in the App Store). New users get a 14-day full-feature free trial — see the Subscription tab (3rd tab in the app). Manage or cancel anytime in Settings → Apple ID → Subscriptions; no refund for the current period. Privacy commitment: no data collection, no account system. Privacy Policy: https://tobebetter2026.github.io/Public-documents/InductorDesignPro/Privacy-policy.html Terms of Use (Apple Standard EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Transformer Calculation Tool

Features
Read full description

Easy Transformer Calculator is a practical and accurate tool designed for electricians, engineers, technicians, and students. Perform transformer calculations instantly with a clean and easy-to-use interface. Whether you're working with electrical systems, power distribution, or learning transformer theory, this app helps simplify complex calculations and improve accuracy. Key Features: • Transformer voltage and current calculations • Turns ratio and power estimation • Supports electrical engineering formulas • Fast, accurate, and easy-to-use interface • Ideal for students, electricians, and professionals • Useful for industrial and educational applications Save time, reduce calculation errors, and simplify transformer analysis with Easy Transformer Calculator. in-app purchase included Lifetime to Remove Ads Privacy Policy : https://docs.google.com/document/d/1A79qPsEUJu1rXjqsSUct_IBBAewiuBK5b8Dz-SPD0CY/edit?usp=sharing Terms & Condition : https://docs.google.com/document/d/1_yiolHxlRnOnEZk_sgPThQ0hggtlZAKCM6NvqDOE8Gs/edit?usp=sharing

Screenshots

Inductor Design Pro4 screens
Transformer Calculation Tool4 screens

Verdict

The call

The clearest difference is iOS requirement: Transformer Calculation Tool at 13.0 against Inductor Design Pro's 15.0. On price, update cadence, 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. Inductor Design Pro sells 1 in-app purchase, starting at $29.99 per year and Transformer Calculation Tool sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Inductor Design Pro ships an update every 3 weeks, Transformer Calculation Tool every 4 weeks. The most recent releases landed on July 4, 2026 and September 16, 2026 respectively.

Scorecard1 real difference · 5 level
Inductor Design Pro versus Transformer Calculation Tool: the parameters behind the verdict, then further details
ParameterInductor Design ProTransformer Calculation Tool
PriceFreeFree
Update frequencyEvery 3 weeks — betterEvery 4 weeks
AdsNoNo
In-app purchasesYesYes
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.013.0 — better
Further details — not scored
Size9 MB57 MB
Age rating4+4+
Developer建忠 徐Shraddhaben Parmar

In-app purchases

1 purchases

Inductor Design Pro

Subscriptions1
  • Annual Subscription14 Days trial$29.991 Year
1 purchases

Transformer Calculation Tool

One-time1
  • Lifetime premium$9.99

Questions

Is Inductor Design Pro free?
Inductor Design Pro is free to download, with in-app purchases available.
Is Transformer Calculation Tool free?
Transformer Calculation Tool is free to download, with in-app purchases available.
Do Inductor Design Pro or Transformer Calculation Tool have ads?
Neither Inductor Design Pro nor Transformer Calculation Tool shows ads.
Which is updated more often, Inductor Design Pro or Transformer Calculation Tool?
Inductor Design Pro ships an update every 3 weeks, and Transformer Calculation Tool every 4 weeks. Most recently, Inductor Design Pro was updated on July 4, 2026 and Transformer Calculation Tool on September 16, 2026.

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