# CISEN KQ vs PDF Editor Studio

The clearest difference is in-app purchases: CISEN KQ at none against PDF Editor Studio's 1. CISEN KQ also leads on update cadence (every 6 days vs every 4 months) and iOS requirement (12.0 vs 15.1). On price, ads and device support there is nothing between them.

Both are free to download. PDF Editor Studio sells 1 one-off in-app purchase. CISEN KQ asks for nothing beyond the download.

CISEN KQ ships an update every 6 days, PDF Editor Studio every 4 months. The most recent releases landed on November 3, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | CISEN KQ | PDF Editor Studio |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/cisen-kq/id1603159529/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 6 days** | Every 4 months |
| Monetization | Free | — |
| Size | 17 MB | 36 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Chesapeake International Consulting, LLC](https://appshunter.io/developer/1589725776) | [StudyBridge LLC](https://appshunter.io/developer/1830101876) |

## What reviewers say

### CISEN KQ

[App page](https://appshunter.io/ios/app/cisen-kq/id1603159529)

This application offers a cutting-edge VPN protocol resistant to quantum attacks, utilizing advanced post-quantum cryptography. It provides robust security and privacy with no registration or tracking, ensuring your digital signature is protected.

**Highlights:** Quantum-resistant VPN protocol, Post-Quantum Cryptography (Kyber 1024), No registration required, No tracking or monitoring, Proprietary binary for enhanced key generation, Multi-layered server hardening

**In-app purchases:** none


### PDF Editor Studio

[App page](https://appshunter.io/ios/app/pdf-editor-studio/id6759298506)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $2.99 | one-time |


## Frequently asked questions

### Is CISEN KQ free?

CISEN KQ is free to download, with no in-app purchases.

### Is PDF Editor Studio free?

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

### Do CISEN KQ or PDF Editor Studio have ads?

Neither CISEN KQ nor PDF Editor Studio shows ads.

### Which is updated more often, CISEN KQ or PDF Editor Studio?

CISEN KQ ships an update every 6 days, and PDF Editor Studio every 4 months. Most recently, CISEN KQ was updated on November 3, 2026 and PDF Editor Studio on November 6, 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.*