Web
16.5px · 44px tap
The sheet on a desk. The default.
App
17px · full-bleed
Installed and standalone; the page becomes the screen.
iOS
17px · 44pt · 44/49 bars
Large title collapses; safe areas honoured.
Android
16px · 48dp · 64/80 bars
Material metrics, none of Material's elevation.
Desktop
16px · 28px pointer
A pointer, not a thumb. Targets may shrink.
Watch
15px · always Nocturne
OLED black. One arc, one reading, one glance.
E-ink
19px · grayscale, no grain
One ink, one paper. The grade is switched off.
Print
A4 · true mm
Where the system started, and still the reference.