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Cal.com vs spectr.pm

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

Cal.com: Cal.com | Scheduling Software for Online Bookings · Above the fold
Cal.com
cal.com· 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.

Cal.com

Heading on canvas

Body copy in the measured muted role.

Primary action
19.1:1 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.

Cal.com

  • canvas#F4F4F4
  • ink#000000
  • muted#374151
  • primary#0D0D0F
  • on-primary#9F9F9F

5 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.

Cal.com

h1

64px · 600 · shown smaller

h1

57px · 600 · shown smaller

display

57px · 900 · shown smaller

h2

48px · 600 · shown smaller

display

48px · 900 · shown smaller

h1

36px · 600

h3

32px · 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.

Cal.com

0px

12px

8px

pill

7px

spectr.pm

0px

Spacing

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

Cal.com

4
8
12
16
20
24
32
40

spectr.pm

4
8
12
16
24
28
32
40

Depth

Shadows cast on each side's own ground.

Cal.com

sm

md

lg

xl

spectr.pm

sm

Buttons

Rendered from the measured computed styles.

Cal.com

filledfilled-lg

spectr.pm

primaryfilledprimary-smtext

The measured values behind the panels above.

Cal.comspectr.pm

At a glance

Ground — these differLightDark
Corners — these differPillSharp
Display size — these differ64px288px
Spacing base4px4px
Accent colours — these differ28
Type families — these differ102
Ink on canvas — these differ19.1:118.6:1
Components — these differ911

Colour roles

primary — these differ#0D0D0F#894DEF
link#0000EE—
canvas — these differ#F4F4F4#0D0D0D
surface—#171717
ink — these differ#000000#FAFAFA
body — these differ#242424#B8B8B8
muted#374151—
hairline—#2E2E2E
on-primary — these differ#9F9F9F#FAFAFA

Full palette

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

All colours — these differ#0D0D0F#0000EE#0099FF#9CA3AF#6B7280#F4F4F4#000000#242424#374151#858585#9F9F9F#FFFFFF#DFDFDF#894DEF#A273F2#14532D#78350F#166534#4ADE80#92400E#FBBF24#0D0D0D#171717#FAFAFA#B8B8B8#2E2E2E#6B6B6B#000000#262626
Semantic——

Typography

Families — these differCal Sans UI Variable LightCal SansInterCUSTOMV2;Cal Sans UI RegularMatter MediumMatter RegularRoboto MonoMatter SemiBoldCal Sans UI RegularpaperMonoInter-e4c28016845df4efJetBrains Mono-33799697913f1f09
hero-display—288px · 900 · 288px · -11.52px · uppercase · Inter-e4c28016845df4ef
h1 — these differ64px · 600 · 70.4px · 0px · Cal Sans72px · 800 · 72px · -2.52px · Inter-e4c28016845df4ef
h2 — these differ48px · 600 · 52.8px · 0px · Cal Sans44px · 800 · 46.2px · -1.32px · Inter-e4c28016845df4ef
display — these differ48px · 900 · 52.8px · 0px · Cal Sans132px · 800 · 198px · -2.64px · Inter-e4c28016845df4ef
h3 — these differ18px · 300 · 23.4px · -0.2px · Cal Sans UI Variable Light19px · 600 · 28.5px · 0px · Inter-e4c28016845df4ef
heading — these differ18px · 300 · 23.4px · -0.2px · Cal Sans UI Variable Light16px · 600 · 24px · 0px · Inter-e4c28016845df4ef
link — these differ16px · 300 · 24px · 0px · Cal Sans UI Variable Light14px · 500 · 20px · 0px · Inter-e4c28016845df4ef
list-item—16px · 500 · 24px · 0px · Inter-e4c28016845df4ef
body — these differ14px · 300 · 19.6px · 0px · Cal Sans UI Variable Light15px · 500 · 23.25px · 0px · Inter-e4c28016845df4ef
input14px · 400 · 20px · 0px · Inter—
code — these differ14px · 600 · 14px · 0px · Roboto Mono13px · 600 · 19.5px · 1.82px · uppercase · JetBrains Mono-33799697913f1f09
caption — these differ12px · 300 · 12px · 0px · Cal Sans UI Variable Light12px · 500 · 16.5px · 0px · Inter-e4c28016845df4ef
button — these differ12px · 600 · 16px · 0px · Inter15px · 600 · 22.5px · 0px · Inter-e4c28016845df4ef

Shape and rhythm

Radius — these differ0px7px8px12px9999px0px
Spacing — these differ4px8px12px16px20px24px32px40px48px56px64px96px4px8px12px16px24px28px32px40px44px48px64px144px
Border widths1px1px

Depth

Strategy — these differlayered-microsingle-tier
Shadows — these differrgba(0, 0, 0, 0.15) 0px 4px 12px 0pxrgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, oklab(0.431624 0.000476062 -0.00154915 / 0.3) 0px 0px 0px 1px, rgba(0, 0, 0, 0) 0px 0px 0px 0pxrgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, oklab(0.367679 0.0000168085 0.00000736117 / 0.25) 0px 0px 0px 1px, rgba(0, 0, 0, 0.05) 0px 1px 2px 0pxrgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgb(0, 0, 0) 0px 0px 0px 0.5px, rgba(0, 0, 0, 0.45) 0px 0.5px 1px 0px, rgba(0, 0, 0, 0.35) 0px 1px 2px 0px, rgba(255, 255, 255, 0.14) 0px 0.5px 0px 0px insetrgba(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: radial-gradient(50% 50%, rgba(255, 255, 255, 0) 87.1499%, rgb(255, 255, 255) 100%)—
Opacity — these differ0.300.380.900.501.000.700.900.940.650.36
Z-index — these differbase 1base 2base 3base 4base 5base 9dropdown 10dropdown 20dropdown 10dropdown 50

Components

Sharedbutton-filledlinkcardnavigationfooterbutton-filledlinkcardnavigationfooter
Only here — these differbutton-filled-lgbadge-textlink-lgcard-smbutton-primarybutton-primary-smbutton-textbutton-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 differlink:hoverinput:focus-visibleinput:hoverother:hoverother:activelink:focusbutton:hovernav:hoverother:focus-visibleother:focusother:disabledother:focus-visibleinput:hoverother:hovercard:hoverother:focusother:disablednav:hovernav:focus-visible

Responsive

Breakpoints — these differ375→367px768→760px1024→1016px1280→1200px1440→1200px375→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
Stylesheets — these differPartly blockedReadable
Roles unassigned — these differ510

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