Squid: Take Notes, Markup PDFs

Squid: Take Notes, Markup PDFs is a portrait-oriented application for annotating and organizing documents. It provides a clean interface for users to mark up PDFs, take notes, and manage their files. The app is designed for casual, interruptible use, making it a convenient tool for on-the-go productivity.

Themes from 200 recent Google Play reviews, analysed 28 Aug 2026

What each behavioural tag is based on

• Short sessionsRuns are self-contained, so stopping early costs you nothing.
• InterruptiblePut it down mid-session and pick it up cold.
• One-handedPlayable with a thumb, in portrait.
• Plays offlineNo connection needed once installed.
• No energy timersNothing caps how long you can play.
• Sound optionalNo audio cue carries information — fine on mute.
• Low focusPlayable while half-distracted.