# Authtify vs PDF Assist

The clearest difference is in-app purchases: Authtify at none against PDF Assist's 4. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. PDF Assist sells 4 in-app purchases, starting at $2.99 per 7 days. Authtify asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 4 months. The most recent releases landed on November 4, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Authtify | PDF Assist |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | Every 4 months |
| Size | 29 MB | 7 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Byteflux](https://appshunter.io/developer/1748538053) | [鑫 王](https://appshunter.io/developer/1816448578) |

## What reviewers say

### Authtify

[App page](https://appshunter.io/ios/app/authtify/id6503684459)

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

**In-app purchases:** none


### PDF Assist

[App page](https://appshunter.io/ios/app/pdf-assist-file-converter/id6747342506)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Subscription | $2.99 | per 7 days |
| Monthly Subscription | $4.99 | per month |
| Annual Subscription | $14.99 | per year |
| Permanent member | $24.99 | one-time |


## Frequently asked questions

### Is Authtify free?

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

### Is PDF Assist free?

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

### Do Authtify or PDF Assist have ads?

Neither Authtify nor PDF Assist shows ads.

### Which is updated more often, Authtify or PDF Assist?

Authtify ships an update every 4 months, and PDF Assist every 4 months. Most recently, Authtify was updated on November 4, 2026 and PDF Assist 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.*