Opensidian is an open-source, non-profit, vault-compatible markdown notes app built in Rust and Tauri v2, presented as a community-driven alternative to Obsidian (not affiliated or endorsed by Obsidian or Dynalist). It targets cross-platform use with a focus on Linux, ships with several Obsidian-compatible themes (AnuPpuccin default, Material Gruvbox, Minimal, Solarized), and supports live-reload for themes and CSS snippets. The project emphasizes transparency and reproducibility: releases are signed (SHA256SUMS with a GPG key) and source builds are documented. A prominent AI disclosure states that most code, design docs, README and many commit messages were generated by Claude (Anthropic) and then reviewed, edited, and curated by a single human maintainer.
Installation and development details matter: multiple Linux packages are provided (slim and portable AppImages, Flatpak, RPM, DEB) and recent testing targets Fedora 44 and Ubuntu 26.04 LTS; WebKitGTK 4.1 is required unless using the portable AppImage. Building from source requires Rust 1.98.0 and standard system dev packages (libwebkit2gtk-4.1-dev, gtk3, librsvg, etc.), with concise build steps (git clone, cargo build --release --locked). Licensed GPL-3.0-or-later with third-party notices, the project seeks Linux distribution maintainers and accepts donations.
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