Comparison

Transformer Calculator. vs Panel Legend 2

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

Head to head
About

Transformer Calculator.

This app simplifies transformer calculations for engineers and students. It accurately computes primary and secondary currents, turns ratios, and secondary voltages based on user inputs for transformer ratings and winding turns.

Highlights
  • Primary and secondary current calculations
  • Turns ratio determination
  • Transformer type identification
  • Secondary voltage calculation
  • Supports 1Φ and 3Φ phases
  • User-friendly interface
Features
Read full description

Transformer Calculator: A user-friendly app for Current and Voltage Calculations. Current Calculations • Calculate primary and secondary full-load currents. • Determine the turns ratio and transformer type. How it works: 1. Select the phase type (1Φ or 3Φ). 2. Input transformer ratings (VA/kVA) and primary/secondary voltages. Outputs: • Primary full-load current • Secondary full-load current • Turns Ratio: N1 / N2 = V1 / V2 = I2/ I1 Voltage Calculations How it works: 1. Enter Number of turns in the primary and secondary windings 2. Input Primary voltage Outputs: • Secondary voltage • Turns Ratio: N1 / N2 = V1 / V2 = I2/ I1 Effortless and Accurate: Perfect for engineers and students to compute transformer parameters precisely.

About

Panel Legend 2

Easily create professional panel legends for any project size. This universal app supports multiple devices and offers features like iCloud sync, PDF export, and color-coded circuit numbers. It also includes helpful construction calculators.

Highlights
  • Create legends of any size
  • iCloud support for cross-device sync
  • Export legends as PDF
  • Color-coded circuit numbers
  • Construction style calculator included
  • Supports inches or centimeters
Features
Read full description

Panel Legend 2 is a fast, easy way to create panel legends for any size of job. Put your pencil down and start making professional legends today. - Universal app allows use on both iPad, Mac, and iPhone/iPod with single purchase. - iCloud support saves your data across multiple devices. - Create legends of any size with any number of circuits. - Print your legends right from the app. - Panel legends save based on job/project to easily locate them later. - Export your legends as pdf. - Include colour coded circuit numbers to easily keep track of phases. - Gang circuit description for multipole breakers. - Enter panel legend size in inches or centimeters. - Support for AB slim line panels. - App includes a full featured construction style calculator, torque calculator and conversion app.

Screenshots

Transformer Calculator.4 screens
Panel Legend 24 screens

Verdict

The call

The clearest difference is price: Transformer Calculator. at Free against Panel Legend 2's $6.99. Transformer Calculator. also leads on rating (4.8 vs 2.3) and ratings volume (47 vs 3). Panel Legend 2's advantage is in-app purchases (none vs 1) and ads (none vs shown). On update cadence 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

CostPrice · In-app purchases · Ads · Monetization

Transformer Calculator. is free to download; Panel Legend 2 costs $6.99 up front. Transformer Calculator. sells 1 one-off in-app purchase. Panel Legend 2 asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Transformer Calculator. holds the better App Store score, 4.8 against 2.3. That said, the two scores are not equally well evidenced: Transformer Calculator. has 47 ratings behind it against 3, so its average is the more settled of the two.

UpkeepUpdate frequency

Transformer Calculator. ships an update every 4 months, Panel Legend 2 every 3 months. The most recent releases landed on September 18, 2026 and August 4, 2026 respectively.

Scorecard7 real differences · 3 level
Transformer Calculator. versus Panel Legend 2: the parameters behind the verdict, then further details
ParameterTransformer Calculator.Panel Legend 2
PriceFree — better$6.99
Rating4.8 (47 ratings) — better2.3 (3 ratings)
Positive reviews—14.3% of reviews
Number of ratings47 — better3
Update frequencyEvery 4 monthsEvery 3 months — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterPaid
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.6 — better26.0
Further details — not scored
Size41 MB19 MB
Age rating4+4+
DeveloperV PUGAZHENTHISnappy Appz Inc.

Customer experience

Transformer Calculator.

All ratings47 ratings
Positive97.9%
Neutral0.0%
Negative2.1%

Panel Legend 2

All ratings3 ratings
Positive33.3%
Neutral0.0%
Negative66.7%
Written reviews7 reviews
Positive14.3%
Neutral0.0%
Negative85.7%

In-app purchases

1 purchases

Transformer Calculator.

One-time1
  • Go Pro$3.99
None

Panel Legend 2

No in-app purchases

Questions

Is Transformer Calculator. free?
Transformer Calculator. is free to download, with in-app purchases available.
Is Panel Legend 2 free?
Panel Legend 2 costs $6.99, with no in-app purchases.
Which has better reviews, Transformer Calculator. or Panel Legend 2?
Transformer Calculator. is rated higher. Transformer Calculator. averages 4.8 out of 5 from 47 ratings, while Panel Legend 2 averages 2.3 from 3 ratings.
Do Transformer Calculator. or Panel Legend 2 have ads?
Transformer Calculator. shows ads; Panel Legend 2 does not.
Which is updated more often, Transformer Calculator. or Panel Legend 2?
Transformer Calculator. ships an update every 4 months, and Panel Legend 2 every 3 months. Most recently, Transformer Calculator. was updated on September 18, 2026 and Panel Legend 2 on August 4, 2026.

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