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InkShuttle

Handwrite on PDFs using your phone

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InkShuttle lets you annotate PDFs on your computer using your phone as a writing surface. Open a PDF in your browser, scan a QR code with your phone, and start writing. Your annotations appear on your computer in real time, and you can save them back to the PDF. Free and no installation required.

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PH · launched Oct 24, 2026 · 1 upvote (top 67%)

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Could you build this?

Yes The core is a PDF viewer plus a phone-to-browser stroke sync over WebSockets or WebRTC, which are well-documented patterns an AI assistant can help assemble.

Competitors

Other products that read as similar to this one : 889 launches clear the similarity bar, closest 8 shown.

Attention rank: #329 of 890 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).

Launched 326 days after the earliest competitor.

Other launches for this product