# Syn vs KyPDF

The clearest difference is in-app purchases: Syn at none against KyPDF's 2. Syn also leads on device support (3 vs 1) and iOS requirement (15.1 vs 18.0). KyPDF's advantage is update cadence (every 4 days vs fortnightly). On price and ads there is nothing between them.

Both are free to download. KyPDF sells 2 in-app purchases, starting at $0.99 per month. Syn asks for nothing beyond the download.

Syn ships an update fortnightly, KyPDF every 4 days. The most recent releases landed on September 30, 2026 and September 7, 2026 respectively.

## The numbers

| Metric | Syn | KyPDF |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 75.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 4 days** |
| Monetization | Free | — |
| Size | 43 MB | 4 MB |
| Requires iOS | **15.1** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Syngular ID](https://appshunter.io/developer/1702701596) | [Claudio Bertini Batista](https://appshunter.io/developer/6777500813) |

## What reviewers say

### Syn

[App page](https://appshunter.io/ios/app/syn/id6461774561)

This app provides secure control over your cloud-based digital certificate. It ensures that only authorized operations, confirmed by your PIN, can be performed with your certificate. You can also use it to audit your account for security and authorized operations.

**Highlights:** Cloud digital certificate management, Exclusive control via mobile app, PIN-based authorization, Security audits, High-security storage (HSM), Operation divergence cancellation

**In-app purchases:** none


### KyPDF

[App page](https://appshunter.io/ios/app/kypdf/id6777500811)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Month | $0.99 | per month |
| Lifetime | $49.99 | one-time |


## Frequently asked questions

### Is Syn free?

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

### Is KyPDF free?

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

### Do Syn or KyPDF have ads?

Neither Syn nor KyPDF shows ads.

### Which is updated more often, Syn or KyPDF?

Syn ships an update fortnightly, and KyPDF every 4 days. Most recently, Syn was updated on September 30, 2026 and KyPDF on September 7, 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.*