Socratus vs OpenDeck

Socratus is a Personal knowledge management system that understands your notes, not just stores them. Ask questions, search by meaning, and see how your ideas connect, with AI that runs privately on your device. Think of it as your second brain, local-first and always under your control. FEATURES AI chat that answers from your own notes, with sources shown Private on-device AI that works offline Semantic and exact-word search with match scoring Interactive knowledge graph of related notes, exportable as an image Related notes ranked by similarity, with related-word tracing Distraction-free editor built for long-form thinking Markdown support and syntax highlighting Dictation, find and replace, adjustable font size, and one-tap save Structured tables with calculations and charts Daily scratchpad with Today's Notes Folders, a clear file tree, and recent files Import and read documents File-level encryption with QEncrypt Portable plain-text files with no lock-in Passwordless sign-in with a secure link WHO IT'S FOR Researchers, writers, students, developers, privacy-minded professionals, and anyone building a personal knowledge management system. PRICING Free for personal use. Professional and Enterprise licenses for commercial work. Turn your knowledge into a living system that grows with you. Socratus is a product of FiveRivers Technologies. Terms of Use (EULA): https://socratus.app/terms-of-service/ Privacy Policy: https://socratus.app/privacy-statement/

OpenDeck is a viewer for self-contained HTML *documents* ("decks"), analogous to a PDF reader or a web browser opening a local page. Decks are content the user explicitly imports (via Files, AirDrop, or the share sheet) — they are not code downloaded to change the app's own features, and the app ships no in-app store or remote-content fetch. Each deck renders inside a sandboxed, cross-origin iframe served from an isolated origin (a custom deck:// scheme on iOS/macOS). The sandbox withholds top-level navigation, so a deck can never replace or reach the app shell or the native bridge. The app's functionality is fixed; decks cannot alter it. (Ref: Guideline 2.5.2.) To test presenting: on first launch the app preloads a short "Welcome" deck plus three example decks (illustrative HTML presentations) — open any of them from the library and move through the slides by tapping the screen (iPhone/iPad), using the on-screen arrow controls or the thumbnail rail, or pressing the left/right arrow keys. To test import: ready-made .deck files are downloadable from the "Examples" section of the home page at https://open-deck.org (smallest is "What Compounding Actually Does", 0.3 MB — direct link: https://open-deck.org/downloads/compounding.deck). Download one on the device, then open it via the system Share sheet → OpenDeck, or from the Files app — it is added to the library. Note: those three decks are also preloaded, and decks are content-addressed, so re-importing one simply refreshes it rather than duplicating; to watch a brand-new deck appear, first delete it from the library (••• → Delete) and then import the downloaded file. (AirDrop'ing any .deck to the device and choosing OpenDeck works too.) The bundled example decks are first-party sample content; any photographs in them are licensed stock imagery (Pexels License, which permits commercial and in-app use). The app collects no data and makes no network requests; everything is stored on-device.