Signal (iOS)

Identity

Mobile Apps

Privacy-first messaging. Single Signal Blue #3A76F0 accent, disappearing-message timer chips, sealed-sender glyphs, zero-vanity minimalism, light + #1B1B1B dark

Typography

InterDisplay

InterBody400 / 500 / 700

Ag

ui-monospaceMono400 / 500 / 700

--text-4xl · 36pxThe quick brown fox

--text-3xl · 28pxThe quick brown fox

--text-2xl · 28pxThe quick brown fox

--text-xl · 28pxThe quick brown fox

--text-lg · 28pxThe quick brown fox

--text-base · 17pxThe quick brown fox

--text-sm · 16pxThe quick brown fox

--text-xs · 10pxThe quick brown fox

Palette

--bg#FFFFFFPage background — defines the brand canvas.

--surface#F5F5F5Card / lifted container background.

--surface-warmcolor-mix(in oklab, var(--surface), var(--fg) 6%)Tertiary surface tier (kami warm-sand).

--fg#000000Primary text color.

--fg-2color-mix(in oklab, var(--fg), var(--bg) 15%)Secondary text tier (kami dark-warm).

--muted#6B6B6BSubtext / captions.

--metacolor-mix(in oklab, var(--muted), var(--bg) 25%)Tertiary FG / metadata tier (kami stone).

--border#E5E5E5Default border / card edge.

--border-softcolor-mix(in oklab, var(--border), var(--bg) 50%)Inner row separator that should not visually compete.

--accent#3A76F0Brand accent. ≤2 visible uses per screen (lint enforced).

--accent-on#FFFFFFFG when --accent is the bg.

--success#3AB54ASuccess state.

--warn#FF9500Warning state.

--danger#D7263DDanger state.

Also named in DESIGN.md

Signal Blue Pressed#2f5fccPressed/active state for blue buttons and the send circle.

Signal Blue Tint#e7eefdLight-mode selected row, blue-wash backgrounds (link previews on outgoing).

Incoming Bubble#e9e9ebLeft-aligned received message bubble.

Text Tertiary#9a9a9aPlaceholders, disabled labels.

Dark Canvas#1b1b1bConversation list, chat background.

Dark Surface#2a2a2aGrouped sections, search field, incoming bubble (dark).

Imagery & layout

Radius

--radius-sm10px

--radius-md18px

--radius-lg18px

--radius-pill9999px

Spacing

--space-1 · 4px

--space-2 · 8px

--space-3 · 12px

--space-4 · 16px

--space-5 · 20px

--space-6 · 24px

--space-8 · 32px

--space-12 · 48px

Elevation

--elev-raised

Layout

Layout rules

Base unit: 4pt
Scale: 4, 8, 12, 16, 20, 24, 32, 44, 56
Bubble inner padding: 9pt vertical, 13pt horizontal
Inter-bubble gap: 2pt within a same-sender run, 8pt between senders/groups
Row inset: avatar leading 16pt, text origin 76pt (divider starts here)
Single column everywhere — list, thread, settings

Component kit

Light Dark