Building an open future

Fasmail creates open source software to power the future of email

Give back to our community and foster a culture of collaboration

Share knowledge to create the best experience for all

Encourage interoperability for email, contacts, and calendars across platforms and apps

JMAP is the open standard for modern email, contact, and calendar clients.

JMAP (RFC 8620) is an IETF Internet Standard.

Cyrus is an open source JMAP server that powers Fastmail.

Cyrus supports JMAP, IMAP, and many other protocols.



Squire is the lightweight, flexible text editor of choice for many apps across the web.

Overture Js

Overture Js

Overture is a high-performance JavaScript framework. It takes a batteries-included approach to provide you the tools to create very fast applications.

Want to help build an open future?