Note taking & PDF library in the age of AI.

Features

• Manage a local library of PDFs.
• PDF annotations (compatible with Skim).
• Markdown & LaTeX editing.
• BibTeX citations.
• AI: ask questions, summaries, tagging, related work, audio, ...
• Metadata are stored in a .json file along the .pdf file.
• Easy to sync via Google Drive or git.
• Web version (see web.md).

Getting started

npm install      # requires node.js
npm start        # builds into dist/ and launches Electron

On first launch, choose one or more library folders and the AI command-line tools you authorize. Settings are saved in ~/omoeba/config.json. More folders can be added later in Settings.

AI

Only AIs with a command-line interface are used, and only those authorized in Settings. Presets:

AI	Command
Claude Code	claude -p --output-format text
OpenAI Codex	codex exec --skip-git-repo-check --sandbox read-only -
Gemini Antigravity	agy -p {prompt} --output-format text --print-timeout 15m

The prompt is sent on standard input, or in place of {prompt} when an argument contains it.

Syncing

I personally sync PDFs using Google Drive. In Omoeba, each .pdf file has a corresponding .json file containing annotations. I also store these .json files in a git repository.

cd "~/My Drive/papers"
git init --separate-git-dir ~/git/papers.git

Development

Built with Electron, TypeScript, pdf.js, KaTeX and CodeMirror.

npm run watch      # rebuild on change (then reload the window with ⌘R)
npm test           # unit tests (.skim codec, sidecars, search index, …)
npm run typecheck