Cursus

What it does

Automation

The optional Cursus Bridge provides an MCP server and JSON CLI for scripts and agents, including tools to read and send email.checked 12 Oct 2026

Data storage

Cursus stores its data alongside the app in a portable folder, so moving the folder moves the data too.checked 12 Oct 2026

Email features

It supports multiple accounts, conversations, search, attachments, drafts, and undo send.checked 12 Oct 2026

Integrations

The site names Claude and Claude Code as Bridge integrations, and identifies SMTP and Resend as sending options.checked 12 Oct 2026

Intended users

The maker describes Cursus as a mail client for people who want a lightweight, private desktop inbox with keyboard controls and no built-in AI.checked 12 Oct 2026

Keyboard

The app has 22 keyboard shortcuts for inbox actions, including navigation, reply, archive, compose, and search.checked 12 Oct 2026

License and signup

The product is Apache-2.0 licensed and can be used without an account or signup.checked 12 Oct 2026

Limitations

Cursus has no built-in AI assistant or cloud sync; the maker says smart replies, summaries, and automatic sorting are not included.checked 12 Oct 2026

Local operation

The Bridge runs locally and closes after use; it does not leave a server or port running on the machine.checked 12 Oct 2026

Privacy

The maker says Cursus has no cloud sync, telemetry, analytics, or crash reports, and blocks remote images by default to prevent tracking pixels.checked 12 Oct 2026

Product

Cursus is a small, open source desktop email app for Windows and Linux that brings multiple accounts into one keyboard-driven client.checked 12 Oct 2026

Search

Search covers subjects, senders, and message bodies across accounts, with one-click indexing for existing mail.checked 12 Oct 2026

Security

Email account passwords are stored in the system keychain rather than in plain text inside the app.checked 12 Oct 2026

Sending

Accounts can send through SMTP or Resend, and undo send gives you up to half a minute to change your mind.checked 12 Oct 2026