# Quick Unit Currency vs PDF AI

The clearest difference is ads: Quick Unit Currency at none against PDF AI's shown. Quick Unit Currency also leads on iOS requirement (13.0 vs 15.5). PDF AI's advantage is update cadence (every 3 days vs every 3 months). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Quick Unit Currency sells 1 one-off in-app purchase and PDF AI sells 6 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

Quick Unit Currency ships an update every 3 months, PDF AI every 3 days. The most recent releases landed on September 25, 2026 and June 6, 2026 respectively.

## The numbers

| Metric | Quick Unit Currency | PDF AI |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 3 days** |
| Size | 25 MB | 142 MB |
| Requires iOS | **13.0** | 15.5 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [MBDTECH LTD](https://appshunter.io/developer/1817225204) | [Saad Ameen](https://appshunter.io/developer/1680660990) |

## What reviewers say

### Quick Unit Currency

[App page](https://appshunter.io/ios/app/quick-unit-currency/id6756127690)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| remove_ads_lifetime_unit | $1.99 | one-time |


### PDF AI

[App page](https://appshunter.io/ios/app/pdf-ai-edit-read-and-analyse/id6763019243)

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Basic Monthly Subscription | $9.99 | per month |
| Remove Ads Forever | $9.99 | one-time |
| 1500 AI Credits | $9.99 | one-time |
| 2500 AI Credits | $14.99 | one-time |
| 4000 AI Credits | $19.99 | one-time |
| 10000 AI Credits | $29.99 | one-time |


## Frequently asked questions

### Is Quick Unit Currency free?

Quick Unit Currency is free to download, with in-app purchases available.

### Is PDF AI free?

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

### Do Quick Unit Currency or PDF AI have ads?

PDF AI shows ads; Quick Unit Currency does not.

### Which is updated more often, Quick Unit Currency or PDF AI?

Quick Unit Currency ships an update every 3 months, and PDF AI every 3 days. Most recently, Quick Unit Currency was updated on September 25, 2026 and PDF AI on June 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.*