A LITTLE CHARACTER. A LOT OF CARE.

Meet Mailsi.
And meet Si.

A warm, thoughtful identity for a calmer kind of inbox. Everything you need to keep Mailsi feeling like Mailsi.

Less inbox. More day.

Pronounced mail-see. Mailsi brings email, calendar and tasks together on Mac. Si is our friendly paper-envelope character: curious, calm and always glad to see you.

One friendly family.

The kit includes outlined wordmarks, light and dark logo lockups, Si artwork, app icons, favicons, a social card, Geist type, design tokens and a practical visual guide. The mascot artwork is supplied as PNG; SVG lockups contain the original artwork alongside outlined lettering.