# Electrical Motor Calculator vs ONE WATCH

The clearest difference is price: ONE WATCH at Free against Electrical Motor Calculator's $2.99. ONE WATCH also leads on update cadence (every 3 days vs every 43 months). Electrical Motor Calculator's advantage is in-app purchases (none vs 3) and iOS requirement (13 vs 18.0). On ads and device support there is nothing between them.

ONE WATCH is free to download; Electrical Motor Calculator costs $2.99 up front. ONE WATCH sells 3 in-app purchases, starting at $2.99 per month. Electrical Motor Calculator asks for nothing beyond the download.

Electrical Motor Calculator ships an update every 43 months, ONE WATCH every 3 days. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Electrical Motor Calculator | ONE WATCH |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[3.8 (8 ratings)](https://appshunter.io/ios/app/electrical-motor-calculator/id1635906150/reviews)** | — |
| Number of ratings | **8** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 43 months | **Every 3 days** |
| Monetization | Paid | — |
| Size | 1 MB | 52 MB |
| Requires iOS | **13** | 18.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Heng Jia Liang](https://appshunter.io/developer/1532000635) | [Johann Szebeni](https://appshunter.io/developer/1880746405) |

## What reviewers say

### Electrical Motor Calculator

[App page](https://appshunter.io/ios/app/electrical-motor-calculator/id1635906150)

This engineering tool calculates key electrical motor characteristics like amps, horsepower, and kVa. Input system voltage, motor efficiency, and power factor to determine electrical values for your system.

**Highlights:** Calculate amps, horsepower, and kVa, Input system voltage and motor efficiency, Converts kilowatts to horsepower, Defines Power Factor (PF) and Full Load Amps (FLA), Calculates Running Load Amps (RLA)

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

**In-app purchases:** none


### ONE WATCH

[App page](https://appshunter.io/ios/app/one-watch-timezone-clock/id6777670673)

**Features:** Family Sharing, Apple Watch app

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $2.99 | per month |
| Premium Yearly | $24.99 | per year |
| Premium Lifetime | $99.99 | one-time |


## Frequently asked questions

### Is Electrical Motor Calculator free?

Electrical Motor Calculator costs $2.99, with no in-app purchases.

### Is ONE WATCH free?

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

### Do Electrical Motor Calculator or ONE WATCH have ads?

Neither Electrical Motor Calculator nor ONE WATCH shows ads.

### Which is updated more often, Electrical Motor Calculator or ONE WATCH?

Electrical Motor Calculator ships an update every 43 months, and ONE WATCH every 3 days. Most recently, Electrical Motor Calculator was updated on November 3, 2026 and ONE WATCH on October 31, 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.*