Comparison

Transformer Calculator Plus vs Voltage Drop Pro

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

Head to head
About

Transformer Calculator Plus

This utility app calculates key parameters for transformers, including voltage, current, and turns ratio. It helps determine if a transformer is step-up or step-down, essential for power conversion applications.

Highlights
  • Calculate primary and secondary voltage
  • Calculate primary and secondary current
  • Calculate transformer turns ratio
  • Determine step-up or step-down transformer
  • Supports AC voltage calculations
Features
Read full description

Transformer Calculator calculate any parameter within the transformer equation, including primary and secondary voltage, current, and turns. Transformer Calculations Include: Transformer Turns Ratio – Current and Turns Transformer Turns Ratio – Voltage and Turns Transformer Turns Ratio – Voltage and Current The result will indicate whether the transformer is step-up or step-down. Transformers are primarily used as power converters. The two types—step-up and step-down—operate on the same principle but in opposite directions. A step-up transformer converts a lower AC voltage to a higher voltage, while a step-down transformer reduces a higher AC voltage to a lower level. For example, if a country uses 110 V power, a step-up transformer converts it to 220 V, and a step-down transformer does the reverse. Both work with alternating current (AC). A transformer consists of a soft iron core with two coils wound around it, which are not electrically connected. These coils may be wound on separate limbs of the iron core or placed one over the other. The coil to which the alternating voltage is applied is called the primary coil or primary winding. When an alternating voltage is applied, the resulting alternating current in the primary winding generates a changing magnetic field. This changing field induces an alternating current in the secondary coil. The magnitude of the induced voltage depends on the number of turns in the secondary winding. All transformers have a nameplate rating. It is best to operate them within the voltage limits specified. Using a step-down transformer below its rated limit can support a wide range of applications, but exceeding the specified limit is dangerous and may cause electrical failure. The relationship between voltage, current, and the number of turns in each coil is given by: Vp/Vs = Np/Ns = Is/Ip Where: Vp – Primary voltage Vs – Secondary voltage Np – Primary turns Ns – Secondary turns Ip – Primary current Is – Secondary current Thank you for your support, and please visit nitrio.com for more apps for your iOS devices.

About

Voltage Drop Pro

Features
Read full description

Voltage Drop Calc is a fast, easy way to create a schedule of voltage drop calculations for any size of job or just to perform a single calculation on the fly. Put your pencil down and start making professional, consistent calculation today. - Universal app allows use on both iPad, and iPhone/iPod with single purchase. - Create an unlimited list of calculations that automatically save. - Export your results to a spreadsheet for formatting or printing. - Solve for distance in feet or meters. - Solve for voltage drop in either voltage or percentage. - Solve for wire size including derating. - Built in construction calculator allows intermediate calculations to be performed within the app.

Screenshots

Transformer Calculator Plus4 screens
Voltage Drop Pro4 screens

Verdict

The call

The clearest difference is update cadence: Voltage Drop Pro at every 2 months against Transformer Calculator Plus's every 45 months. Transformer Calculator Plus's advantage is price ($2.99 vs $3.99) and iOS requirement (13.0 vs 17.5). On ads, in-app purchases 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 Plus costs $2.99 and Voltage Drop Pro $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Transformer Calculator Plus ships an update every 45 months, Voltage Drop Pro every 2 months. The most recent releases landed on September 10, 2026 and July 9, 2026 respectively.

Scorecard3 real differences · 7 level
Transformer Calculator Plus versus Voltage Drop Pro: the parameters behind the verdict, then further details
ParameterTransformer Calculator PlusVoltage Drop Pro
Price$2.99 — better$3.99
Rating3.3 (4 ratings) — better—
Positive reviews0.0% of reviews—
Number of ratings4 — better—
Update frequencyEvery 45 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaid—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS13.0 — better17.5
Further details — not scored
Size1 MB15 MB
Age rating4+4+
DeveloperNitrioSnappy Appz Inc.

In-app purchases

None

Transformer Calculator Plus

No in-app purchases

None

Voltage Drop Pro

No in-app purchases

Questions

Is Transformer Calculator Plus free?
Transformer Calculator Plus costs $2.99, with no in-app purchases.
Is Voltage Drop Pro free?
Voltage Drop Pro costs $3.99, with no in-app purchases.
Do Transformer Calculator Plus or Voltage Drop Pro have ads?
Neither Transformer Calculator Plus nor Voltage Drop Pro shows ads.
Which is updated more often, Transformer Calculator Plus or Voltage Drop Pro?
Transformer Calculator Plus ships an update every 45 months, and Voltage Drop Pro every 2 months. Most recently, Transformer Calculator Plus was updated on September 10, 2026 and Voltage Drop Pro on July 9, 2026.

Other comparisons