# Wattson vs Right Calculator

The clearest difference is in-app purchases: Right Calculator at none against Wattson's 1. Right Calculator also leads on device support (3 vs 1). Wattson's advantage is ads (none vs shown). On price, update cadence and iOS requirement there is nothing between them.

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

Wattson ships an update every 5 days, Right Calculator every 6 days. The most recent releases landed on October 20, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Wattson | Right Calculator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Every 5 days** | Every 6 days |
| Size | 44 MB | 41 MB |
| Requires iOS | 16.0 | **15.1** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Marin Martinovic](https://appshunter.io/developer/1871459610) | [Megabyte Software Inc.](https://appshunter.io/developer/1143972928) |

## What reviewers say

### Wattson

[App page](https://appshunter.io/ios/app/wattson-electrical-calculator/id6760766587)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Wattson Pro | $5.99 | one-time |


### Right Calculator

[App page](https://appshunter.io/ios/app/right-calculator/id6768528621)

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

**In-app purchases:** none


## Frequently asked questions

### Is Wattson free?

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

### Is Right Calculator free?

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

### Do Wattson or Right Calculator have ads?

Right Calculator shows ads; Wattson does not.

### Which is updated more often, Wattson or Right Calculator?

Wattson ships an update every 5 days, and Right Calculator every 6 days. Most recently, Wattson was updated on October 20, 2026 and Right Calculator on October 7, 2026.

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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.*