# ENGEL e vs WatchMask

The clearest difference is in-app purchases: ENGEL e at none against WatchMask's 3. ENGEL e also leads on iOS requirement (13.0 vs 15.0). WatchMask's advantage is update cadence (every 2 days vs every 4 months). On price, ads and device support there is nothing between them.

Both are free to download. WatchMask sells 3 in-app purchases, starting at $1.99 per year. ENGEL e asks for nothing beyond the download.

ENGEL e ships an update every 4 months, WatchMask every 2 days. The most recent releases landed on October 9, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | ENGEL e | WatchMask |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 25.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 days** |
| Monetization | Free | — |
| Size | 29 MB | 9 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ENGEL AUSTRIA GmbH](https://appshunter.io/developer/687631542) | [luo](https://appshunter.io/developer/538978569) |

## What reviewers say

### ENGEL e

[App page](https://appshunter.io/ios/app/engel-e-calc/id687631539)

This tool simplifies complex calculations for injection molders, including stroke volume, clamping force, cooling time, and screw speed. Get accurate results quickly and clearly displayed on a single page, eliminating the need for tedious manual computations.

**Highlights:** Calculate stroke volume, Determine clamping force, Estimate cooling time, Calculate screw speed, Clear, structured results display, Quick calculations

**Features:** macOS Compatibility

**In-app purchases:** none


### WatchMask

[App page](https://appshunter.io/ios/app/watchmask/id1590637517)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Standard | $1.99 | per year |
| Premium | $4.99 | per year |
| Pro | $9.99 | per year |


## Frequently asked questions

### Is ENGEL e free?

ENGEL e is free to download, with no in-app purchases.

### Is WatchMask free?

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

### Do ENGEL e or WatchMask have ads?

Neither ENGEL e nor WatchMask shows ads.

### Which is updated more often, ENGEL e or WatchMask?

ENGEL e ships an update every 4 months, and WatchMask every 2 days. Most recently, ENGEL e was updated on October 9, 2026 and WatchMask on October 11, 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.*