mailsi
BRAND GUIDE · 01
Identity · voice · product truth

Less inbox.
More day.

A warm, considered identity for the local-first Mac app that brings email, calendar, and tasks together.

Mailsi is pronounced “mail-see.”
Mail + SI: super intelligence, an aspiration in the name.OCT 2026
Si, the waving envelope mascot
01 / POSITION

Calm, capable,
all together.

Less inbox. More day. Mailsi gives everyday communication and planning a thoughtful home on Mac: capable without corporate stiffness, and warm without becoming childish.

Short descriptor

Email, calendar, and tasks together on your Mac.

Product today

Local-first macOS app for email, calendar, and tasks. Optionally pull in issues assigned to you from Linear.

“Your day, in one place.” · “A calmer place for your day.” · “Email, plans, and tasks—together on Mac.”

02 / WORDMARK

Simple name.
Room to breathe.

Set the wordmark in lowercase Geist with a generous, close-set rhythm. The live examples are typographic specimens; use the approved vector lockup for production when available.

LIGHT BACKGROUND

Ink wordmark on Paper or Pale Peach.

DARK BACKGROUND

Paper wordmark; keep Si’s original colors.

Clear space

At least the lowercase “m” height around the lockup.

Minimum size

Start at 120 px wide for lockup and 24 px for mark. Increase if details blur.

Keep it intact

No stretching, effects, outlines, rotations, or recoloring.

03 / SI

A little wave
of welcome.

Si is a friendly paper-envelope sprite and a visual guide. Si is not an implemented AI assistant and never implies background action.

Full-body Si mascot: rounded white envelope, charcoal face, orange paper tuft and boots

Full-body art · Use when the pose adds a welcome or simple explanation.

Compact Si mascot mark

Compact mark · Use in tight spaces; preserve clear facial detail.

Personality

Calm · curious · encouraging · simple · never intrusive

UseWelcome moments, simple UI states, restrained brand sign-offs.
AvoidDepicting private reading or autonomous sending, scheduling, deleting, or task changes.
04 / COLOR

Warm paper.
Bright punctuation.

Let the warm neutrals carry the canvas. Tangerine is a deliberate accent and a large-surface color, with Ink for legible text.

Ink#262521 · 38, 37, 33Text, logo, strong surfaces
Tangerine#ED8965 · 237, 137, 101Ornament, large fills; Ink text
Pale Peach#FFF0E8 · 255, 240, 232Soft warm surfaces
Paper#FFFDF8 · 255, 253, 248Main canvas and cards
Pebble#ECEAE5 · 236, 234, 229Quiet boundaries and fills
Muted Ink#65625B · 101, 98, 91Supporting copy on light surfaces
Pair Tangerine with Ink. White text on Tangerine does not provide enough contrast for normal text. Do not rely on color alone to signal a state.
05 / TYPE

Big and bold.
Easy to read.

Geist Variable, self-hosted. Use scale and whitespace for hierarchy, with sentence case and a comfortable reading measure.

Geist Variable · 750
A clearer
kind of busy.
Display · 64 / 0.98 · weight 700–800
A thoughtful home for email, calendar, and tasks—right on your Mac.
Body large · 18 / 1.55 · weight 400–450
H144 / 1.05 · 700
H230 / 1.15 · 650–700
H322 / 1.25 · 600–650
Body16 / 1.5 · 400–450
Small14 / 1.45 · 400–500
Label12 / 1.3 · 550–650
06 / VOICE

Friendly means
clear and kind.

Use ordinary words, specific guidance, and quiet confidence. Warmth belongs in the phrasing; claims stay grounded in what the product does.

Product introduction“Email, calendar, and tasks together on your Mac.”
Linear connection“Optionally show issues assigned to you in Linear.”
Empty state“Nothing on your calendar yet. Add an event when you’re ready.”
Connection error“We couldn’t connect to this account. Check your connection and try again.”
07 / PRODUCT SCOPE

Say what ships.

“SI” is a word story and an ambition. Today, Mailsi brings email, calendar, and tasks to macOS, with an optional pull of assigned Linear issues. AI features are not implemented.

Accurate today

“Mailsi is a local-first macOS email, calendar, and tasks app. Optionally pull in issues assigned to you from Linear.”

Do not claim

Autonomous AI, AI-powered features, automatic email actions, guaranteed outcomes, or unverified privacy guarantees.

Avoid implying availability on unconfirmed platforms. This guide does not make trademark, domain, or name-availability promises.

08 / ACCESSIBILITY

Comfort comes
with clarity.

Visual warmth should never reduce access. Check implemented screens at real sizes and with assistive technology.

Contrast and colorMeet WCAG AA for text and essential controls; pair color with labels, shapes, or icons.
Keyboard and assistive techVisible focus, semantic headings, labeled controls, useful image alt text.
MotionRespect reduced-motion preferences. Keep animation brief, optional, and never looping by default.
Responsive readingAllow text resizing and reflow. Keep meaningful copy out of images.
Form and component shape

Pill buttons · 20px panels · 12px fields · clear focus rings · comfortable targets