# Electronics Toolkit calc vs PDF Watermark Expert

The clearest difference is price: PDF Watermark Expert at Free against Electronics Toolkit calc's $4.99. Electronics Toolkit calc's advantage is in-app purchases (none vs 3) and ads (none vs shown). On update cadence, device support and iOS requirement there is nothing between them.

PDF Watermark Expert is free to download; Electronics Toolkit calc costs $4.99 up front. PDF Watermark Expert sells 3 in-app purchases, starting at $2.99 per 7 days. Electronics Toolkit calc asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 4 months. The most recent releases landed on November 12, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Electronics Toolkit calc | PDF Watermark Expert |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/pdf-watermark-expert/id6737170415/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | Every 4 months |
| Monetization | — | Free with in-app purchases |
| Size | 25 MB | 68 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kantaben Gorasiya](https://appshunter.io/developer/1640260396) | [Muhammad Awais Younas](https://appshunter.io/developer/1771187232) |

## What reviewers say

### Electronics Toolkit calc

[App page](https://appshunter.io/ios/app/electronics-toolkit-calc/id6473828034)

**Features:** macOS Compatibility

**In-app purchases:** none


### PDF Watermark Expert

[App page](https://appshunter.io/ios/app/pdf-watermark-expert/id6737170415)

Easily add custom text watermarks to your PDF documents for enhanced security and branding. Personalize fonts, colors, transparency, and position to protect your files from misuse and plagiarism. The app offers a user-friendly interface and cross-platform compatibility for seamless document workflow.

**Highlights:** Add custom text watermarks, Full watermark customization, Secure PDF files, User-friendly interface, Cross-platform compatibility, Fast processing

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Week | $2.99 | per 7 days |
| Premium Month | $7.99 | per month |
| Premium Year | $44.99 | per year |


## Frequently asked questions

### Is Electronics Toolkit calc free?

Electronics Toolkit calc costs $4.99, with no in-app purchases.

### Is PDF Watermark Expert free?

PDF Watermark Expert is free to download, with in-app purchases available.

### Do Electronics Toolkit calc or PDF Watermark Expert have ads?

PDF Watermark Expert shows ads; Electronics Toolkit calc does not.

### Which is updated more often, Electronics Toolkit calc or PDF Watermark Expert?

Electronics Toolkit calc ships an update every 4 months, and PDF Watermark Expert every 4 months. Most recently, Electronics Toolkit calc was updated on November 12, 2026 and PDF Watermark Expert on October 30, 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.*