OciDeck

A desktop application for building Marp presentations through a structured, slide-by-slide editor — no raw Markdown wrangling required. Compose decks from typed slide templates (title, bullets, quotes, tables, images, video, audio, source code, charts), preview them live, present them fullscreen — even across two screens — and export to Marp Markdown, PDF, PPTX, and self-contained HTML.

Built with Flutter for macOS, Windows, and Linux.

What's in a name? OciDeck is a small wink: Oci is borrowed from the Ocicats — the cats of Brenno de Winter — and Deck is short for a presentation deck. So: the cats' presentation tool.

Features

• Structured slide editors — dedicated editors per slide type: title, bullets, two-column bullets, bullets + image, single/two images, quote, table, section divider, image-only, video, audio, source code, charts, and free-form Markdown.
• Source-code slides — a "code sheet" with per-language syntax highlighting, stored as a fenced code block. Background, text colour and monospace font come from the style profile, with an optional syntax-colouring toggle (turn it off for a single-colour, CRT-terminal look). The code auto-sizes to fill the panel.
• Charts — bar, line, pie, and spider/radar charts rendered natively (preview, presenter, PDF, PPTX) and as self-contained SVG in the HTML export. Data is entered in an in-app grid or imported from CSV; the spec is stored as JSON in the Markdown, with optional linking to a CSV kept in a tidy data/ directory. Optional min/max draw reference lines (bar/line) or fix the scale (radar); legend hover highlights a series, and line tooltips pick the dot under the cursor.
• Live preview — see each slide rendered as you edit, with inline Markdown, footers, and TLP (Traffic Light Protocol) marking. Free-Markdown slides render fenced code with syntax highlighting and $…$ / $$…$$ LaTeX math.
• Traffic Light Protocol — a deck-wide classification plus an optional per-slide TLP level; slides classified stricter than the level the deck is shown at are automatically withheld, both when presenting and exporting.
• Fullscreen presenter — keyboard-driven navigation, presenter view, blank screen, auto-advance, and a slide-grid overview.
• Dual-screen presenter — when a second display is connected, the beamer shows the slide while the laptop shows the presenter view (current/next slide, notes, timer), kept in sync.
• Annotation layer — draw on slides while presenting (pen, highlighter, eraser, laser pointer). Kept as a separate layer that never touches the Marp Markdown, mirrored live to the beamer, and saved in a .ink.json sidecar.
• Media handling — drag-and-drop images, an image carousel picker, captions, and descriptions stored as sidecar metadata. The library can filter images without tags and clean up md5-identical duplicates (merging their tags/captions and repointing every deck — open or on disk — to the kept file).
• Import / export — round-trips Marp Markdown, imports existing slides, and exports to PDF, PPTX (with speaker notes), and a self-contained offline HTML deck (code highlighting, math, charts, and mermaid diagrams render in the browser). Decks are saved as a self-contained package with copied assets.
• Productivity — find & replace, slide finder, undo/redo, skip-slide state, multi-select with bulk copy-to-another-deck / delete / skip, and tabbed multi-deck editing. Paste a spreadsheet selection (or CSV / a markdown table) into a table cell to fill the whole grid. Ctrl/Cmd+O opens, Ctrl/Cmd+S saves.
• Accessibility — WCAG 2.1-oriented: interface text scaling up to 200%, keyboard-operable panel divider and dialogs, screen-reader labels for slides and charts (charts read out their data), and slide-change announcements while presenting.
• Crash recovery — automatic snapshots so work survives an unexpected exit.
• Theming — customizable deck style profiles (deck and source-code colours via presets or custom hex, fonts, logo, footer) and app appearance (including a dark interface), a bundled Marp CSS theme (assets/themes/ocideck.css), and a bundled EB Garamond font (no network fetch).
• Localized — Dutch, English, Italian, German, French, Spanish, Frisian, and Papiamento.

Requirements

• Flutter SDK ^3.12.0 (Dart 3.12+)
• A desktop target enabled: macOS, Windows, or Linux

Getting started

make setup      # flutter pub get
flutter run -d macos   # or -d windows / -d linux

Development

The Makefile is the entry point for all quality checks. Run make help for the full list.

make check        # format check + static analysis + full test suite (the quality gate)
make check-full   # check + dependency freshness report
make format       # auto-format all Dart code
make analyze      # flutter analyze only
make test         # full test suite only

Targeted test groups speed up focused work:

Target	Covers
make test-contracts	Markdown generation/parsing, save-load round-trips, field migration
make test-preview	Slide rendering, footers, TLP, inline Markdown, text styles
make test-export	PDF/PPTX export and project file-save behavior
make test-state	Providers, undo/redo, search/replace, settings, recovery
make test-services	Image, caption, and description sidecar services
make test-presenter	Fullscreen presenter navigation and keyboard shortcuts

Run make check before pushing — it is the same quality gate (format check, static analysis, full test suite) you would wire into CI.

Project layout

lib/
  models/     # Deck, Slide, Settings data models
  services/   # Markdown, export, file, image, caption, recovery, rasterizer
  state/      # Riverpod providers (deck, editor, settings, tabs, clipboard)
  widgets/    # UI: app shell, panels, dialogs, per-type editors, presenter
  l10n/       # AppLocalizations (8 languages)
  theme/      # App theming
  utils/      # Small shared helpers (clipboard table parsing, URL launching)

State is managed with Riverpod.

File format

Presentations are saved as standard, Marp-compatible Markdown (.md) with a defined project folder layout and an optional portable .ocideck package. Anything that isn't plain Marp is kept in side files so the .md stays pure and portable: image captions, the annotation layer (.ink.json), and linked chart data (data/*.csv). The full specification — front matter, per-slide markup, style profile, sidecars, and the package format — is documented in docs/FILE_FORMAT.md.

Documentation

Document	What it covers
User Guide	Using the app: slide types, charts, presenting, exporting, theming
Keyboard shortcuts	Editor and presenter shortcuts
File format	The Marp Markdown, front matter, sidecars, and .ocideck package
Architecture	How the code fits together (for contributors)
Build & release	Building from source and producing distributables
Contributing	Setup, the quality gate, and how to propose changes
Security policy	How to report a vulnerability
Changelog	Notable changes per version
Third-party notices	Bundled components and their licences
Licence compliance	Open-source policy and the make licenses check

Contributing

Contributions are welcome! Please read CONTRIBUTING.md and our CODE_OF_CONDUCT.md. In short: make check must pass, new UI strings must be translated in all languages, and file-format changes must be reflected in docs/FILE_FORMAT.md. For security issues, see SECURITY.md.

License

Copyright © Brenno de Winter.

OciDeck is licensed under the European Union Public Licence v. 1.2 (EUPL-1.2). You may use, study, share, and modify the software under the terms of that licence. The full text is in LICENSE.md; the official versions in all EU languages are available from the EUPL collection.

SPDX-License-Identifier: EUPL-1.2