# Wattage Conversion vs Zap Calculator

The clearest difference is in-app purchases: Zap Calculator at none against Wattage Conversion's 1. Wattage Conversion's advantage is ads (none vs shown) and iOS requirement (15.6 vs 18.5). On price and device support there is nothing between them.

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

## The numbers

| Metric | Wattage Conversion | Zap Calculator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Monthly | — |
| Size | 37 MB | 5 MB |
| Requires iOS | **15.6** | 18.5 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [akira ohmachi](https://appshunter.io/developer/1338624340) | [Ryoga Okada](https://appshunter.io/developer/1844157518) |

## What reviewers say

### Wattage Conversion

[App page](https://appshunter.io/ios/app/wattage-conversion/id6473688997)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |


### Zap Calculator

[App page](https://appshunter.io/ios/app/zap-calculator/id6753641613)

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

**In-app purchases:** none


## Frequently asked questions

### Is Wattage Conversion free?

Wattage Conversion is free to download, with in-app purchases available.

### Is Zap Calculator free?

Zap Calculator is free to download, with no in-app purchases.

### Do Wattage Conversion or Zap Calculator have ads?

Zap Calculator shows ads; Wattage Conversion does not.

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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.*