# NanoPDF vs WatchPDF

The clearest difference is price: NanoPDF at Free against WatchPDF's $4.99. WatchPDF's advantage is update cadence (weekly vs every 6 weeks) and iOS requirement (16.0 vs 18.6). On ads, in-app purchases and device support there is nothing between them.

NanoPDF is free to download; WatchPDF costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

NanoPDF ships an update every 6 weeks, WatchPDF weekly. The most recent releases landed on October 7, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | NanoPDF | WatchPDF |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| 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 | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Weekly** |
| Monetization | — | Paid |
| Size | 6 MB | 16 MB |
| Requires iOS | 18.6 | **16.0** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Giovanni Outerleys](https://appshunter.io/developer/1557846953) | [kim juyoung](https://appshunter.io/developer/918406157) |

## What reviewers say

### NanoPDF

[App page](https://appshunter.io/ios/app/nanopdf/id6467386184)

**In-app purchases:** none


### 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


## Frequently asked questions

### Is NanoPDF free?

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

### Is WatchPDF free?

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

### Do NanoPDF or WatchPDF have ads?

Neither NanoPDF nor WatchPDF shows ads.

### Which is updated more often, NanoPDF or WatchPDF?

NanoPDF ships an update every 6 weeks, and WatchPDF weekly. Most recently, NanoPDF was updated on October 7, 2026 and WatchPDF on October 2, 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.*