# CypherGuard PDF vs 技術士｜資格試験対策学習アプリ

The clearest difference is in-app purchases: CypherGuard PDF at none against 技術士｜資格試験対策学習アプリ's 1. CypherGuard PDF also leads on ads (none vs shown) and update cadence (every 5 months vs every 54 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. 技術士｜資格試験対策学習アプリ sells 1 one-off in-app purchase. CypherGuard PDF asks for nothing beyond the download.

CypherGuard PDF ships an update every 5 months, 技術士｜資格試験対策学習アプリ every 54 months. The most recent releases landed on October 29, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | CypherGuard PDF | 技術士｜資格試験対策学習アプリ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (3 ratings)](https://appshunter.io/ios/app/cypherguard-pdf/id781435650/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 5 months** | Every 54 months |
| Monetization | Free | — |
| Size | 29 MB | 21 MB |
| Requires iOS | **14.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [CypherTec Inc.](https://appshunter.io/developer/507907491) | [SAKURA LLC](https://appshunter.io/developer/982915828) |

## What reviewers say

### CypherGuard PDF

[App page](https://appshunter.io/ios/app/cypherguard-pdf/id781435650)

View and access protected PDF documents using advanced cryptographic technology. This application allows you to open regular PDFs and securely view encrypted files after authentication.

**Highlights:** View protected PDF documents, Open encrypted PDF files, Authentication for secure access, Supports regular PDF documents, Content protection features

**Features:** Vision Pro support

**In-app purchases:** none


### 技術士｜資格試験対策学習アプリ

[App page](https://appshunter.io/ios/app/id1616449432)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 有料問題 | $2.99 | one-time |


## Frequently asked questions

### Is CypherGuard PDF free?

CypherGuard PDF is free to download, with no in-app purchases.

### Is 技術士｜資格試験対策学習アプリ free?

技術士｜資格試験対策学習アプリ is free to download, with in-app purchases available.

### Do CypherGuard PDF or 技術士｜資格試験対策学習アプリ have ads?

技術士｜資格試験対策学習アプリ shows ads; CypherGuard PDF does not.

### Which is updated more often, CypherGuard PDF or 技術士｜資格試験対策学習アプリ?

CypherGuard PDF ships an update every 5 months, and 技術士｜資格試験対策学習アプリ every 54 months. Most recently, CypherGuard PDF was updated on October 29, 2026 and 技術士｜資格試験対策学習アプリ 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.*