Etymology: Derived from the Latin verb nūntiō ("I announce", "I declare", "I deliver a message") and noun nūntius ("messenger", "courier", "bearer of tidings"). Nuncio is built as the ultimate cross-platform messenger and calendar courier.

Overview

Nuncio follows a library-first architecture. All core business logic, protocol synchronization, offline storage, indexing, and state management are isolated within headless Rust libraries. Presentation layers remain lightweight shells driving a command line interface (CLI), terminal UI (TUI), or native desktop GUI.

Workspace Architecture

crates/nuncio-core: Workspace management, account orchestration, async event routing.
crates/nuncio-mail: IMAP4rev1, JMAP (RFC 8620/8621), and SMTP protocol engines.
crates/nuncio-cal: CalDAV and iCalendar (RFC 5545) client libraries.
crates/nuncio-store: Encrypted local persistence and SQLite FTS5 search indexing.
crates/nuncio-cli: Scriptable command-line interface binary for Unix pipes and automation.
crates/nuncio-tui: Terminal user interface powered by Ratatui.
crates/nuncio-gui: Native desktop graphical user interface shell.

Requirements & Building

Rust 1.75+ toolchain

cargo build --workspace

To run the command-line interface:

cargo run -p nuncio-cli -- status

To run the terminal client:

cargo run -p nuncio-tui

To run the desktop GUI client:

cargo run -p nuncio-gui

License

MIT OR Apache-2.0

Local-first, engine-first mail, calendar & contacts engine in Rust: a daemon (nunciod) that owns all state and publishes a versioned gRPC API. Pre-alpha, under active reconstruction.

https://nuncio.mx

caldav calendar carddav cli contacts email-client imap jmap mcp ratatui rust smtp sovereign tauri tui

Readme

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