VDrop vs Transformer Calculator.
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
VDrop
This utility calculates voltage drop for electrical systems up to 600V. It provides detailed calculation outputs to help users verify results and build confidence in their electrical work. Custom voltage inputs are supported.
- Voltage drop calculations
- Supports up to 600V
- Custom voltage input
- Detailed calculation outputs
- User confidence building
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600V and less voltage drop calculator. Outputs provide the user details from the calculations to allow users to perform due diligence and develop confidence in the results. Custom voltages may be inputted (600V and less) also.
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.
- Primary and secondary current calculations
- Turns ratio determination
- Transformer type identification
- Secondary voltage calculation
- Supports 1Φ and 3Φ phases
- User-friendly interface
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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
Verdict
The clearest difference is in-app purchases: VDrop at none against Transformer Calculator.'s 1. VDrop also leads on ads (none vs shown) and rating (5.0 vs 4.8). Transformer Calculator.'s advantage is update cadence (every 4 months vs every 13 months) and ratings volume (47 vs 3). On price 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
Both are free to download. Transformer Calculator. sells 1 one-off in-app purchase. VDrop asks for nothing beyond the download.
VDrop holds the better App Store score, 5.0 against 4.8. 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.
VDrop ships an update every 13 months, Transformer Calculator. every 4 months. The most recent releases landed on June 1, 2026 and September 18, 2026 respectively.
| Parameter | VDrop | Transformer Calculator. |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (3 ratings) — better | 4.8 (47 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 3 | 47 — better |
| Update frequency | Every 13 months | Every 4 months — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 10.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 13 MB | 41 MB |
| Age rating | 4+ | 4+ |
| Developer | Nebulous LLC | V PUGAZHENTHI |
Customer experience
VDrop
Transformer Calculator.
In-app purchases
VDrop
No in-app purchases
Transformer Calculator.
- Go Pro$3.99
Questions
Is VDrop free?
Is Transformer Calculator. free?
Which has better reviews, VDrop or Transformer Calculator.?
Do VDrop or Transformer Calculator. have ads?
Which is updated more often, VDrop or Transformer Calculator.?
Other comparisons
