Comparison

NanoPDF vs WatchPDF

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

NanoPDF

Read full description

Discover NanoPDF, the app that transforms how you access PDF documents by making them available right on your Apple Watch. With NanoPDF, your essential files are with you everywhere, whether for work or leisure, making viewing your documents an effortless experience. Here’s a glimpse of the key features: Quick Access: Browse your PDFs with ease directly from your watch. Seamless Sync: Select a PDF on your iPhone and find it instantly on your watch. Easy Zoom: A simple tap on your watch screen to zoom for optimal reading, even of the most delicate texts. Ergonomic Navigation: The Digital Crown enables intuitive navigation through pages and zooming into specific details. Simple Deletion: Once finished reading, quickly delete the PDF from your watch. Integrated Guide: New to NanoPDF? Our built-in tutorial will quickly get you comfortable with all the features offered. NanoPDF is the perfect companion for professionals on the move, and anyone looking to blend productivity with mobility. Download NanoPDF today and transform your watch into a dynamic portable library for all your PDFs!

About

WatchPDF

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
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PDF app for Apple Watch only View PDF files by inserting them into your Apple Watch. You can check PDF files anytime, anywhere on your Apple Watch. The watch app can be run alone, but To send PDF files to Apple Watch, you need the iPhone app. Please make sure you have an Apple Watch before purchasing the app. The iPhone app does not support viewing PDF files. The iPhone app sends PDF files to a connected Apple Watch. *Features* - Device: Apple Watch (WatchOS 10+), iPhone (iOS 17+) - File: PDF - Zoom in and out: Zoom in and out of content using the zoom in/zoom out buttons. - Page mode: Switch pages back and forth and go to a specific page - Vertical mode: Navigate pages by scrolling up and down in the list - Support for password-locked PDFs - Runs alone on Apple Watch, iPhone app required for file transfer - Touch the content screen to hide and display various menus and buttons - App screen brightness - App Lock: Only possible when the watch is password-protected ** Phone Streaming ** - Browse and open files inside nearby iPhone app from paired Apple Watch app, and switch pages - Access, browse, and open files on your iPhone from your watch without transferring them to your watch - Paired iPhone and Apple Watch must be in close proximity, and install and run the app on iPhone - Page quality will be adjusted. ** Search "WatchPDF" on YouTube to watch a usage video. ** Our app does not provide separate PDF files. PDF files can be viewed by inserting the file stored by the app user into the app.

Screenshots

NanoPDF4 screens
WatchPDF4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

UpkeepUpdate frequency

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

Scorecard3 real differences · 7 level
NanoPDF versus WatchPDF: the parameters behind the verdict, then further details
ParameterNanoPDFWatchPDF
PriceFree — better$4.99
Rating—5.0 (1 ratings) — better
Positive reviews—88.9% of reviews
Number of ratings—1 — better
Update frequencyEvery 6 weeksWeekly — better
AdsNoNo
In-app purchasesNoNo
Monetization—Paid
DevicesiPhone, iPad, Apple Watch — betteriPhone, Apple Watch
Requires iOS18.616.0 — better
Further details — not scored
Size6 MB16 MB
Age rating4+4+
DeveloperGiovanni Outerleyskim juyoung

In-app purchases

None

NanoPDF

No in-app purchases

None

WatchPDF

No in-app purchases

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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