# Sterna Vault vs PDF Compressor

The clearest difference is in-app purchases: Sterna Vault at none against PDF Compressor's 3. Sterna Vault also leads on update cadence (every 3 weeks vs every 3 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. PDF Compressor sells 3 in-app purchases, starting at $4.99 per 7 days. Sterna Vault asks for nothing beyond the download.

Sterna Vault ships an update every 3 weeks, PDF Compressor every 3 months. The most recent releases landed on October 28, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Sterna Vault | PDF Compressor |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (5 ratings)](https://appshunter.io/ios/app/pdf-compressor-pdfpress/id6756151715/reviews)** |
| Number of ratings | — | **5** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 3 months |
| Monetization | — | Free with in-app purchases |
| Size | 67 MB | 44 MB |
| Requires iOS | 16.6 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Sterna Security Devices Private Limited](https://appshunter.io/developer/1751436158) | [Imad Khan](https://appshunter.io/developer/1835041090) |

## What reviewers say

### Sterna Vault

[App page](https://appshunter.io/ios/app/sterna-vault/id6755238912)

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

**In-app purchases:** none


### PDF Compressor

[App page](https://appshunter.io/ios/app/pdf-compressor-pdfpress/id6756151715)

Easily reduce the size of PDF files without sacrificing quality. Organize documents with folders and import PDFs instantly. Ideal for students, professionals, and anyone needing to manage digital documents efficiently.

**Highlights:** Ultra-efficient PDF compression (up to 98%), High-quality output, Simple file picker, Built-in folder organization, Fast, intuitive interface, Works offline, Share compressed PDFs (Premium)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Premium | $4.99 | per 7 days |
| Yearly Premium | $19.99 | per year |
| Lifetime Premium | $12.99 | one-time |


## Frequently asked questions

### Is Sterna Vault free?

Sterna Vault is free to download, with no in-app purchases.

### Is PDF Compressor free?

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

### Do Sterna Vault or PDF Compressor have ads?

Neither Sterna Vault nor PDF Compressor shows ads.

### Which is updated more often, Sterna Vault or PDF Compressor?

Sterna Vault ships an update every 3 weeks, and PDF Compressor every 3 months. Most recently, Sterna Vault was updated on October 28, 2026 and PDF Compressor 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.*