# Transformer Calculation Tool vs Voltage Drop.

The clearest difference is in-app purchases: Voltage Drop. at none against Transformer Calculation Tool's 1. On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Transformer Calculation Tool sells 1 one-off in-app purchase. Voltage Drop. asks for nothing beyond the download.

## The numbers

| Metric | Transformer Calculation Tool | Voltage Drop. |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 weeks | — |
| Size | 57 MB | 18 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Shraddhaben Parmar](https://appshunter.io/developer/1889769325) | [Eyup Ensar ORAL](https://appshunter.io/developer/6772512446) |

## What reviewers say

### Transformer Calculation Tool

[App page](https://appshunter.io/ios/app/transformer-calculation-tool/id6772152007)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime premium | $9.99 | one-time |


### Voltage Drop.

[App page](https://appshunter.io/ios/app/voltage-drop/id6780509345)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Transformer Calculation Tool free?

Transformer Calculation Tool is free to download, with in-app purchases available.

### Is Voltage Drop. free?

Voltage Drop. is free to download, with no in-app purchases.

### Do Transformer Calculation Tool or Voltage Drop. have ads?

Neither Transformer Calculation Tool nor Voltage Drop. shows ads.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*