Kestrel Mail

Documentation

Acknowledgements

Kestrel Mail wouldn't exist without the work of these open-source projects and the platform they run on.

Updated March 27, 2026

App foundations

  • SwiftMail — the IMAP and SMTP library at the heart of Kestrel's mail transport.
  • SwiftSoup — HTML parsing and sanitization for safe message rendering.
  • llama.cpp — the inference engine behind the optional enhanced local model pack.

Website

  • Astro — the framework powering this site.

Apple platform

Kestrel leans heavily on Apple's frameworks — SwiftUI, WebKit, Quick Look, Contacts, Foundation Models, and the Keychain and authentication APIs that make a native Mac app feel right.

Thank you

None of this would be possible without the open-source maintainers and platform teams who build and maintain these tools. Genuine thanks for the work.