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Arc vs spectr.pm

Two design systems side by side, measured from the live sites — colour, type, shape, depth, components, states and responsive behaviour.

Arc: A farewell to Arc · Above the fold
Arc
arc.net· read 2026-11-03
spectr.pm: Spectr - AI Product Ops: Meetings to PRDs, Specs & Stories · Above the fold
spectr.pm
spectr.pm· read 2026-10-14

Ground and ink

Each side painted in its own measured canvas, ink, muted and primary roles.

Arc

Heading on canvas

Body copy in the measured muted role.

Primary action
19.7:1 ink on canvas

spectr.pm

Heading on canvas

Body copy in the measured muted role.

Primary action
18.6:1 ink on canvas

Palette

Named roles first, then every colour measured without one.

Arc

  • canvas#0B0B0B
  • ink#FFFFFF
  • muted#9F9F9F
  • hairline#000000
  • primary#FFFFFF
  • on-primary#222222

4 more, no measured role

spectr.pm

  • canvas#0D0D0D
  • surface#171717
  • ink#FAFAFA
  • hairline#2E2E2E
  • primary#894DEF
  • on-primary#FAFAFA

10 more, no measured role

Type scale

Set at the measured size, weight, tracking and leading. Brand typefaces are not loaded, so the metrics are real and the letterforms are not.

Arc

h1

76px · 600 · shown smaller

h1

67px · 700 · shown smaller

h2

64px · 600 · shown smaller

h1

46px · 700 · shown smaller

heading

38px · 350

h1

36px · 700

h2

28px · 600

spectr.pm

hero-display

288px · 900 · shown smaller

display

280px · 900 · shown smaller

display

252px · 900 · shown smaller

display

200px · 900 · shown smaller

display

132px · 800 · shown smaller

display

99px · 600 · shown smaller

h2

92px · 800 · shown smaller

Corners

Drawn at the measured radii.

Arc

0px

12px

pill

10px

spectr.pm

0px

Spacing

One shared scale across both sides, so the bars are directly comparable.

Arc

4
8
12
16
20
24
32
36

spectr.pm

4
8
12
16
24
28
32
40

Depth

Shadows cast on each side's own ground.

Arc

sm

spectr.pm

sm

Buttons

Rendered from the measured computed styles.

Arc

primaryoutlinetext

spectr.pm

primaryfilledprimary-smtext

The measured values behind the panels above.

Arcspectr.pm

At a glance

GroundDarkDark
Corners — these differPillSharp
Display size — these differ76px288px
Spacing base4px4px
Accent colours — these differ38
Type families — these differ72
Ink on canvas — these differ19.7:118.6:1
Components — these differ1411

Colour roles

primary — these differ#FFFFFF#894DEF
accent#0047FF—
canvas — these differ#0B0B0B#0D0D0D
surface—#171717
ink — these differ#FFFFFF#FAFAFA
body — these differ#FFFCEC#B8B8B8
muted#9F9F9F—
hairline — these differ#000000#2E2E2E
on-primary — these differ#222222#FAFAFA

Full palette

Every colour each extraction kept, including the ones with no measured role.

All colours — these differ#FFFFFF#0047FF#6E5DBF#2702C2#3C3C43#0B0B0B#3139FB#FFFCEC#9F9F9F#7F7F7F#222222#000000#1A1A1A#894DEF#A273F2#14532D#78350F#166534#4ADE80#92400E#FBBF24#0D0D0D#171717#FAFAFA#B8B8B8#2E2E2E#6B6B6B#000000#262626
Semantic——

Typography

Families — these differABC Oracle-apple-systemExposure VARABC Favorit MonoMarlinMarlin Soft SQInterVariableInter-e4c28016845df4efJetBrains Mono-33799697913f1f09
hero-display—288px · 900 · 288px · -11.52px · uppercase · Inter-e4c28016845df4ef
display—132px · 800 · 198px · -2.64px · Inter-e4c28016845df4ef
heading — these differ38px · 350 · 49.02px · -1.14px · ABC Oracle16px · 600 · 24px · 0px · Inter-e4c28016845df4ef
h1 — these differ36px · 700 · normal · 0px · -apple-system72px · 800 · 72px · -2.52px · Inter-e4c28016845df4ef
h2 — these differ28px · 600 · 36px · 0px · -apple-system44px · 800 · 46.2px · -1.32px · Inter-e4c28016845df4ef
button — these differ22px · 350 · 26.4px · -0.44px · ABC Oracle15px · 600 · 22.5px · 0px · Inter-e4c28016845df4ef
body — these differ17px · 350 · 26.18px · -0.25px · ABC Oracle15px · 500 · 23.25px · 0px · Inter-e4c28016845df4ef
h3 — these differ16px · 350 · normal · 0px · ABC Oracle19px · 600 · 28.5px · 0px · Inter-e4c28016845df4ef
link — these differ16px · 500 · 28px · 0px · -apple-system14px · 500 · 20px · 0px · Inter-e4c28016845df4ef
list-item — these differ16px · 400 · normal · 0px · Marlin16px · 500 · 24px · 0px · Inter-e4c28016845df4ef
table-header14px · 500 · 21px · 0px · -apple-system—
nav-link14px · 500 · normal · -0.28px · Marlin Soft SQ—
h413px · 400 · 18.59px · 1.82px · uppercase · ABC Favorit Mono—
code — these differ13px · 400 · 13.767px · 1.82px · uppercase · ABC Favorit Mono13px · 600 · 19.5px · 1.82px · uppercase · JetBrains Mono-33799697913f1f09
caption — these differ11px · 500 · 11px · -0.44px · -apple-system12px · 500 · 16.5px · 0px · Inter-e4c28016845df4ef

Shape and rhythm

Radius — these differ0px10px12px9999px0px
Spacing — these differ4px8px12px16px20px24px32px36px40px48px56px184px4px8px12px16px24px28px32px40px44px48px64px144px
Border widths1px1px

Depth

Strategysingle-tiersingle-tier
Shadows — these differrgba(0, 0, 0, 0.1) 0px 5px 5px 0pxrgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0.1) 0px 10px 15px -3px, rgba(0, 0, 0, 0.1) 0px 4px 6px -4px
Gradients — these differsection: linear-gradient(rgba(245, 245, 245, 0.84), rgba(245, 245, 245, 0.84)), linear-gradient(rgb(255, 255, 255) 80px, rgba(255, 255, 255, 0) 200px)section: linear-gradient(color(srgb 0.552941 0.482353 1 / 0.16), color(srgb 0.552941 0.482353 1 / 0.16)), linear-gradient(rgba(0, 0, 0, 0), rgba(0, 0, 0, 0)), nonesection: linear-gradient(color(srgb 1 0.666667 0.2 / 0.16), color(srgb 1 0.666667 0.2 / 0.16)), linear-gradient(rgba(0, 0, 0, 0), rgba(0, 0, 0, 0)), nonesection: linear-gradient(color(srgb 0.0352941 0.788235 0.988235 / 0.16), color(srgb 0.0352941 0.788235 0.988235 / 0.16)), linear-gradient(rgba(43, 127, 174, 0.12), rgba(43, 127, 174, 0.12)), nonesection: linear-gradient(color(srgb 0.113725 0.933333 0.717647 / 0.16), color(srgb 0.113725 0.933333 0.717647 / 0.16)), linear-gradient(rgba(43, 127, 174, 0.12), rgba(43, 127, 174, 0.12)), nonesection: linear-gradient(90deg, rgb(214, 214, 214) 0%, rgb(222, 222, 222) 26.93%, rgb(222, 222, 222) 74.77%, rgb(214, 214, 214) 100%)section: linear-gradient(0deg, rgb(250, 250, 250), rgb(255, 255, 255))—
Opacity — these differ0.600.400.300.890.110.061.000.700.900.940.650.36
Z-index — these differbase 1base 3dropdown 50dropdown 98dropdown 99sticky 100dropdown 10dropdown 50

Components

Sharedbutton-primarybutton-textcardfooterlinknavigationbutton-primarybutton-textcardfooterlinknavigation
Only here — these differbutton-outlinecard-smbadge-filledbadge-textbadge-filled-2badge-text-2footer-smlink-2button-filledbutton-primary-smbutton-text-2card-lglink-sm
Signature——

Interaction states

Read from each site's own stylesheets. An empty side means they were cross-origin and unreadable.

Measured — these differbutton:focus-visibleother:hoverother:focus-visibleother:focusbutton:hoverbutton:disabledlink:hoverother:activeother:focus-visibleinput:hoverother:hovercard:hoverother:focusother:disablednav:hovernav:focus-visible

Responsive

Breakpoints — these differ375→351px · 2col768→645px · 2col1024→860px · 2col1280→950px · 3col1440→1069px · 3col375→343px · 6col768→704px · 3col1024→960px · 5col1280→1216px · 5col1440→1376px · 5col

Themes

Measured on the live site, not derived.

SupportSingle themeSingle theme

How this was measured

Differences here are ours, not the brands'.

Pages read66
Extracted — these differ2026-11-032026-10-14
StylesheetsReadableReadable
Roles unassigned — these differ410

Measured by DesignMD from the live sites. Compare two others. Generate a DESIGN.md for your own site.