# PDF File Protector vs Whois Master

The clearest difference is price: Whois Master at $0.59 against PDF File Protector's $19.99. Whois Master also leads on in-app purchases (none vs 1) and update cadence (every 2 weeks vs every 2 months). On ads, device support and iOS requirement there is nothing between them.

PDF File Protector costs $19.99 and Whois Master $0.59 up front. PDF File Protector sells 1 one-off in-app purchase. Whois Master asks for nothing beyond the download.

PDF File Protector ships an update every 2 months, Whois Master every 2 weeks. The most recent releases landed on September 26, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | PDF File Protector | Whois Master |
| --- | --- | --- |
| Price | $19.99 | **$0.59** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | — | Paid |
| Size | 7 MB | 4 MB |
| Requires iOS | 16.6 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [乐祥 胡](https://appshunter.io/developer/1572365721) | [Emre Keles](https://appshunter.io/developer/1780421225) |

## What reviewers say

### PDF File Protector

[App page](https://appshunter.io/ios/app/pdf-file-protector/id6738285744)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| pdf签名内购 | $9.99 | one-time |


### Whois Master

[App page](https://appshunter.io/ios/app/whois-master/id6738364976)

This utility app allows users to perform comprehensive web lookups. It provides access to domain information, DNS records, SSL certificate details, and IP address tracking. It's designed to be a fast, reliable, and user-friendly tool for exploring essential web data.

**Highlights:** Domain lookups, DNS record access, SSL certificate details, IP address tracking, User-friendly interface

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is PDF File Protector free?

PDF File Protector costs $19.99, and also offers in-app purchases.

### Is Whois Master free?

Whois Master costs $0.59, with no in-app purchases.

### Do PDF File Protector or Whois Master have ads?

Neither PDF File Protector nor Whois Master shows ads.

### Which is updated more often, PDF File Protector or Whois Master?

PDF File Protector ships an update every 2 months, and Whois Master every 2 weeks. Most recently, PDF File Protector was updated on September 26, 2026 and Whois Master on September 19, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*