# PDF Key vs Big Timer

The clearest difference is in-app purchases: PDF Key at none against Big Timer's 1. PDF Key also leads on iOS requirement (16.0 vs 18.6). Big Timer's advantage is update cadence (every 6 days vs monthly). On price, ads and device support there is nothing between them.

Both are free to download. Big Timer sells 1 one-off in-app purchase. PDF Key asks for nothing beyond the download.

PDF Key ships an update monthly, Big Timer every 6 days. The most recent releases landed on September 30, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | PDF Key | Big Timer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Monthly | **Every 6 days** |
| Size | 5 MB | 16 MB |
| Requires iOS | **16.0** | 18.6 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Riku Kanai](https://appshunter.io/developer/6779163817) | [Tsukutena](https://appshunter.io/developer/6786964253) |

## What reviewers say

### PDF Key

[App page](https://appshunter.io/ios/app/pdf-key/id6782367129)

**Features:** Vision Pro support

**In-app purchases:** none


### Big Timer

[App page](https://appshunter.io/ios/app/big-timer-countdown-and-repeat/id6786964251)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Upgrade | $3.99 | one-time |


## Frequently asked questions

### Is PDF Key free?

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

### Is Big Timer free?

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

### Do PDF Key or Big Timer have ads?

Both PDF Key and Big Timer show ads.

### Which is updated more often, PDF Key or Big Timer?

PDF Key ships an update monthly, and Big Timer every 6 days. Most recently, PDF Key was updated on September 30, 2026 and Big Timer on October 8, 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.*