# WatchPDF vs くじ電卓

The clearest difference is price: くじ電卓 at Free against WatchPDF's $4.99. WatchPDF's advantage is in-app purchases (none vs 1) and ads (none vs shown). On device support and iOS requirement there is nothing between them.

くじ電卓 is free to download; WatchPDF costs $4.99 up front. くじ電卓 sells 1 one-off in-app purchase. WatchPDF asks for nothing beyond the download.

WatchPDF ships an update weekly, くじ電卓 every 2 months. The most recent releases landed on October 24, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | WatchPDF | くじ電卓 |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/watchpdf/id6502047038/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 88.9% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Weekly** | Every 2 months |
| Monetization | Paid | — |
| Size | 16 MB | 8 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | iPhone, Apple Watch | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [kim juyoung](https://appshunter.io/developer/918406157) | [JIAPENG Zhao](https://appshunter.io/developer/1877119025) |

## What reviewers say

### WatchPDF

[App page](https://appshunter.io/ios/app/watchpdf/id6502047038)

View PDF files directly on your Apple Watch. This app allows you to access and navigate PDFs stored on your paired iPhone without needing to transfer them. Enjoy convenient PDF viewing anytime, anywhere.

**Highlights:** View PDFs on Apple Watch, Stream PDFs from iPhone, Zoom and navigate pages, Support for password-locked PDFs, Adjustable screen brightness, App Lock feature

**Features:** Apple Watch app

**In-app purchases:** none


### くじ電卓

[App page](https://appshunter.io/ios/app/and/id6762051496)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 広告非表示 | $1.99 | one-time |


## Frequently asked questions

### Is WatchPDF free?

WatchPDF costs $4.99, with no in-app purchases.

### Is くじ電卓 free?

くじ電卓 is free to download, with in-app purchases available.

### Do WatchPDF or くじ電卓 have ads?

くじ電卓 shows ads; WatchPDF does not.

### Which is updated more often, WatchPDF or くじ電卓?

WatchPDF ships an update weekly, and くじ電卓 every 2 months. Most recently, WatchPDF was updated on October 24, 2026 and くじ電卓 on October 18, 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.*