OpenDeck vs Sozi

OpenDeck is a free player for self-contained presentation documents in the `.deck` format. An AI agent can build a deck from a talk description, document, or spreadsheet, including its structure, slides, motion, and voice narration. Decks can also contain toggles, drag-to-reorder controls, and tap-to-reveal interactions. Users can export a `.deck` file for OpenDeck apps or a standalone HTML page. A `.deck` file includes what it needs for playback and can run offline without depending on a server. OpenDeck runs on iPhone, iPad, and Mac; exported HTML decks open in modern browsers on any device. The homepage lists browser and Windows apps as available and says Android is coming soon. Setup options are offered for Claude Code, Claude web, Claude desktop, Antigravity CLI, OpenCode, and Codex. OpenDeck is free forever with no in-app purchases. Its privacy policy says the app collects no personal data and makes no network requests, and that imported decks remain on the device. The app is Apache-2.0 licensed, its authoring kit is MIT licensed, and the `.deck` format is CC0 public domain.

Sozi is a free presentation editor and player for SVG documents. It lays content out on a poster rather than a fixed slide sequence, then presents it through translations, zooms, and rotations. The editor creates and saves frames, supports undo and redo, and lets users change keyboard shortcuts in preferences. PDF and video conversion are integrated into the editor. Presentations can be embedded in HTML with an iframe and controlled by JavaScript from the containing page. Sozi runs on the web, Windows, macOS, and Linux, with offline access and presenter mode listed. Windows is distributed as a zip archive without an installer. A Docker setup combines Sozi with Inkscape and conversion tools. It is licensed under the Mozilla Public License 2.0, is not sold commercially, and accepts donations.