Comparison

STS vs Transformer Calculator.

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

Head to head
About

STS

This utility helps users select the appropriate Siemens soft starter for their specific needs. It simulates applications based on various parameters and provides detailed reports, with direct links to product data.

Highlights
  • Soft starter application simulation
  • Input data for environment, motor, and load
  • Starting parameter configuration
  • Suggested soft starter selection
  • Simulation and component reports
  • Direct access to Siemens Industry Mall data
Read full description

This application allows users to find the right Siemens soft starter for his specific application. Features: * Simulate a soft starter application based on your input data: ** Environment & supply ** Motor ** Load ** Starting parameters for the application ** Additional functions ** Starting profile * Select a suggested soft starter * Generate a report for a selected soft starter with the summary of the simulation and optional feeder main components * Direct access to selected soft starter data in the Siemens Industry Mall * Metrics: SI and Imperial * Languages: English, German, Chinese, French, Spanish, Portuguese, Turkish, Czech, Italian and Russian

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.

Screenshots

STS4 screens
Transformer Calculator.4 screens

Verdict

The call

The clearest difference is in-app purchases: STS at none against Transformer Calculator.'s 1. STS also leads on ads (none vs shown) and rating (5.0 vs 4.8). Transformer Calculator.'s advantage is ratings volume (48 vs 1). On price, 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

Both are free to download. Transformer Calculator. sells 1 one-off in-app purchase. STS asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

STS holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Transformer Calculator. has 48 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

STS ships an update every 5 months, Transformer Calculator. every 4 months. The most recent releases landed on October 16, 2026 and October 10, 2026 respectively.

Scorecard6 real differences · 3 level
STS versus Transformer Calculator.: the parameters behind the verdict, then further details
ParameterSTSTransformer Calculator.
PriceFreeFree
Rating5.0 (1 ratings) — better4.8 (48 ratings)
Number of ratings148 — better
Update frequencyEvery 5 monthsEvery 4 months — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS12.2 — better17.6
Further details — not scored
Size67 MB41 MB
Age rating4+4+
DeveloperSiemens AGV PUGAZHENTHI

Customer experience

STS

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Transformer Calculator.

All ratings48 ratings
Positive97.9%
Neutral0.0%
Negative2.1%

In-app purchases

None

STS

No in-app purchases

1 purchases

Transformer Calculator.

One-time1
  • Go Pro$3.99

Questions

Is STS free?
STS is free to download, with no in-app purchases.
Is Transformer Calculator. free?
Transformer Calculator. is free to download, with in-app purchases available.
Which has better reviews, STS or Transformer Calculator.?
STS is rated higher. STS averages 5.0 out of 5 from 1 ratings, while Transformer Calculator. averages 4.8 from 48 ratings.
Do STS or Transformer Calculator. have ads?
Transformer Calculator. shows ads; STS does not.
Which is updated more often, STS or Transformer Calculator.?
STS ships an update every 5 months, and Transformer Calculator. every 4 months. Most recently, STS was updated on October 16, 2026 and Transformer Calculator. on October 10, 2026.

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