# KeyFill vs PDF AI

The clearest difference is update cadence: KeyFill at every 10 days against PDF AI's every 9 months. PDF AI's advantage is iOS requirement (15.1 vs 17.6). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. KeyFill sells 1 one-off in-app purchase and PDF AI sells 2 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

KeyFill ships an update every 10 days, PDF AI every 9 months. The most recent releases landed on September 18, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | KeyFill | PDF AI |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 10 days** | Every 9 months |
| Size | 10 MB | 70 MB |
| Requires iOS | 17.6 | **15.1** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Mark Lester Edquilane](https://appshunter.io/developer/1782537235) | [Sherif Mahmoud](https://appshunter.io/developer/1793455743) |

## What reviewers say

### KeyFill

[App page](https://appshunter.io/ios/app/keyfill/id6740271503)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Unlimited Items | $1.99 | one-time |


### PDF AI

[App page](https://appshunter.io/ios/app/pdf-ai-docs-pdf-email/id6746380492)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monat | $3.99 | per month |
| Pro Jahr | $24.99 | per year |


## Frequently asked questions

### Is KeyFill free?

KeyFill 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 KeyFill or PDF AI have ads?

Neither KeyFill nor PDF AI shows ads.

### Which is updated more often, KeyFill or PDF AI?

KeyFill ships an update every 10 days, and PDF AI every 9 months. Most recently, KeyFill was updated on September 18, 2026 and PDF AI on September 20, 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.*