Show HN: Theorem – Offline PDF/ePub reader that writes highlights to Local Vault

Category: library

Tags: ebook-reader, local-first, markdown, tauri, rss-reader

Score: 7.0/10 (Innovation: 6, Technical: 8, Documentation: 7, Utility: 7)

Theorem is an offline-first ebook, PDF, and RSS reader that saves highlights and notes to local Markdown, integrating with Obsidian and Logseq. It supports multiple formats, TTS, and OPDS catalogs, built with TypeScript and Rust via Tauri for cross-platform desktop and Android.

Target audience: readers, knowledge workers, developers, researchers

Repository: https://theorem.fundaments.work/ · TypeScript · MIT · 12 stars

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