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Duolingo vs spectr.pm

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

Duolingo: Duolingo - The world’s most popular way to learn · Above the fold
Duolingo
duolingo.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.

Duolingo

Heading on canvas

Body copy in the measured muted role.

Primary action
8.7:1 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.

Duolingo

  • canvas#FFFFFF
  • ink#4B4B4B
  • hairline#3C3C3C
  • primary#0000EE

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.

Duolingo

h1

64px · 700 · shown smaller

h2

48px · 700 · shown smaller

heading

32px · 700

body

17px · 400

link

17px · 400

body

17px · 700

button

15px · 700

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.

Duolingo

0px

12px

spectr.pm

0px

Spacing

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

Duolingo

12
16
24
32
40
48
64
72

spectr.pm

4
8
12
16
24
28
32
40

Depth

Shadows cast on each side's own ground.

Duolingo

No shadows measured.

spectr.pm

sm

Buttons

Rendered from the measured computed styles.

Duolingo

texttext-sm

spectr.pm

primaryfilledprimary-smtext

The measured values behind the panels above.

Duolingospectr.pm

At a glance

Ground — these differLightDark
Corners — these differSoftSharp
Display size — these differ64px288px
Spacing base — these differ12px4px
Accent colours — these differ68
Type families22
Ink on canvas — these differ8.7:118.6:1
Components — these differ611

Colour roles

primary — these differ#0000EE#894DEF
link#A5ED6E—
canvas — these differ#FFFFFF#0D0D0D
surface—#171717
ink — these differ#4B4B4B#FAFAFA
body — these differ#777777#B8B8B8
hairline — these differ#3C3C3C#2E2E2E
on-primary—#FAFAFA

Full palette

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

All colours — these differ#0000EE#A5ED6E#1CB0F6#100F3E#000437#042C60#FFFFFF#58CC02#4B4B4B#777777#3C3C3C#AFAFAF#894DEF#A273F2#14532D#78350F#166534#4ADE80#92400E#FBBF24#0D0D0D#171717#FAFAFA#B8B8B8#2E2E2E#6B6B6B#000000#262626
Semantic——

Typography

Families — these differfeatherduolingo-sansInter-e4c28016845df4efJetBrains Mono-33799697913f1f09
hero-display—288px · 900 · 288px · -11.52px · uppercase · Inter-e4c28016845df4ef
display—132px · 800 · 198px · -2.64px · Inter-e4c28016845df4ef
h1 — these differ64px · 700 · normal · -1.28px · feather72px · 800 · 72px · -2.52px · Inter-e4c28016845df4ef
h2 — these differ48px · 700 · normal · 0px · feather44px · 800 · 46.2px · -1.32px · Inter-e4c28016845df4ef
heading — these differ32px · 700 · normal · 0px · duolingo-sans16px · 600 · 24px · 0px · Inter-e4c28016845df4ef
h3—19px · 600 · 28.5px · 0px · Inter-e4c28016845df4ef
body — these differ17px · 400 · 24px · 0px · duolingo-sans15px · 500 · 23.25px · 0px · Inter-e4c28016845df4ef
link — these differ17px · 400 · 20px · 0px · duolingo-sans14px · 500 · 20px · 0px · Inter-e4c28016845df4ef
list-item—16px · 500 · 24px · 0px · Inter-e4c28016845df4ef
button — these differ15px · 700 · 17.25px · 0.8px · uppercase · duolingo-sans15px · 600 · 22.5px · 0px · Inter-e4c28016845df4ef
code—13px · 600 · 19.5px · 1.82px · uppercase · JetBrains Mono-33799697913f1f09
caption—12px · 500 · 16.5px · 0px · Inter-e4c28016845df4ef

Shape and rhythm

Radius — these differ0px12px0px
Spacing — these differ12px16px24px32px40px48px64px72px80px96px100px140px4px8px12px16px24px28px32px40px44px48px64px144px
Border widths — these differ1px2px1px

Depth

Strategy — these differcolor-blockingsingle-tier
Shadows — these differ—rgba(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——
Opacity — these differ0.801.000.700.900.940.650.36
Z-index — these differbase 2dropdown 10dropdown 50

Components

Sharedbutton-textnavigationfooterlinklink-smbutton-textnavigationfooterlinklink-sm
Only here — these differbutton-text-smbutton-primarybutton-filledbutton-primary-smbutton-text-2cardcard-lg
Signature——

Interaction states

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

Measured — these differother:hoverother:focuslink:focuslink:hoverbutton:hoverother:disabledinput:focuslink:focus-visiblebutton:focusother:activeother:focus-visibleinput:hoverother:hovercard:hoverother:focusother:disablednav:hovernav:focus-visible

Responsive

Breakpoints — these differ375→345px · 5col768→503px · 1col1024→503px · 1col1280→988px · 1col1440→988px · 1col375→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 read—6
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.