# PDF Factory Plus vs Secret Diary

The clearest difference is review sentiment: Secret Diary at 70% against PDF Factory Plus's 25%. Secret Diary also leads on update cadence (every 3 months vs every 26 months) and rating (5.0 vs 4.7). PDF Factory Plus's advantage is ratings volume (10 vs 1). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. PDF Factory Plus sells 1 one-off in-app purchase and Secret Diary sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Secret Diary holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: PDF Factory Plus has 10 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 25% of PDF Factory Plus's written reviews are positive against 70% of Secret Diary's.

PDF Factory Plus ships an update every 26 months, Secret Diary every 3 months. The most recent releases landed on June 1, 2026 and August 23, 2026 respectively.

## The numbers

| Metric | PDF Factory Plus | Secret Diary |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (10 ratings)](https://appshunter.io/ios/app/pdf-factory-plus/id1663406658/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/secret-diary-password-notes/id6445909382/reviews)** |
| Number of ratings | **10** | 1 |
| Positive reviews | 25.0% of reviews | **70.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 26 months | **Every 3 months** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 61 MB | 66 MB |
| Requires iOS | 15.6 | **15** |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [路 张](https://appshunter.io/developer/562716999) | [伟 葛](https://appshunter.io/developer/1028908732) |

## What reviewers say

### PDF Factory Plus

[App page](https://appshunter.io/ios/app/pdf-factory-plus/id1663406658)

This app offers a comprehensive suite of local PDF processing tools, ensuring your files remain secure and private. It provides intuitive features for editing, converting, merging, and protecting PDF documents without requiring an internet connection or account creation.

**Highlights:** Local PDF processing for enhanced security, Password protection and decryption, Page deletion and extraction, Merge multiple PDFs, Image and XPS to PDF conversion, PDF repair and linearization, PDF to scanned file conversion

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PDF Factory Plus | Free | one-time |


### Secret Diary

[App page](https://appshunter.io/ios/app/secret-diary-password-notes/id6445909382)

Securely record your daily life and protect your privacy with this easy-to-use digital journal. Customize entries with beautiful fonts and quickly find past notes using content search. It offers password protection for exclusive access.

**Highlights:** Password protection, Secure diary entries, Customizable fonts, Content search, User-friendly interface, Privacy protection

**Features:** Family Sharing, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Premium | $2.99 | one-time |


## Frequently asked questions

### Is PDF Factory Plus free?

PDF Factory Plus is free to download, with in-app purchases available.

### Is Secret Diary free?

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

### Which has better reviews, PDF Factory Plus or Secret Diary?

Secret Diary is rated higher. PDF Factory Plus averages 4.7 out of 5 from 10 ratings, while Secret Diary averages 5.0 from 1 ratings.

### Do PDF Factory Plus or Secret Diary have ads?

Neither PDF Factory Plus nor Secret Diary shows ads.

### Which is updated more often, PDF Factory Plus or Secret Diary?

PDF Factory Plus ships an update every 26 months, and Secret Diary every 3 months. Most recently, PDF Factory Plus was updated on June 1, 2026 and Secret Diary on August 23, 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.*