Squid: Take Notes, Markup PDFs

Squid turns your Android tablet, phone, or Chromebook into a digital notebook. For over 12 years, the app has helped millions of users ditch paper, saving money and reducing waste. Write with a pen, erase with your finger, work with PDFs, and create presentations — all with a natural writing feel.

The app supports low-latency ink for smooth and responsive writing. Notes are stored locally on your device, requiring no account or sign-in. You can organize them into folders, export as PDFs, images, or the Squid Note format, and share via cloud services.

Squid has been recognized by Google Play and Samsung, including Editors' Choice. Core features include vector graphics, various paper backgrounds (ruled, graph, blank), undo/redo, image handling, and a dark theme. Premium unlocks specialized backgrounds, advanced tools, and backup capabilities.