Platforms

Lock Screen, widgets and Live Activities

System surfaces on iOS: Lock Screen, Dynamic Island, StandBy, widget families and Live Activities.

Lock Screen, Dynamic Island and StandBy

HIG sizes for a 402 pt-wide phone: 371 pt wide, 84–160 pt tall, 14 pt margins. Content follows the approved v3 Live Activity spec.

Lock ScreenAccessory widgets and the Live Activity. The banner presentation reuses this layout.

Dynamic IslandCompact leading shows the route and compact trailing shows the value. Minimal shows the value. Expanded shows two arrivals with a footer. There is no island on iPhone 17e.

StandBy (night)The small widget is scaled up and drawn without a background. In low light the system turns it red monochrome, which is why status must be a word. A Live Activity in StandBy starts minimal, and tapping it opens the Lock Screen layout at 2×.

Widget families and sizes

HIG widget dimensions. Apple's table stops at the 430 × 932 class. Standard margin is 16 pt.

Family	393 × 852 class	430 × 932 class	Where (iPhone)	v3 spec	App today	Status
`systemSmall`	158 × 158	170 × 170	Home Screen, Today, StandBy, CarPlay	2 arrivals, refresh top-right (proposed)	Shipped, tap only	Compliant
`systemMedium`	338 × 158	364 × 170	Home Screen, Today	4 arrivals	Shipped, tap only	Compliant
`systemLarge`	338 × 354	364 × 382	Home Screen, Today	6 arrivals (proposed)	Not supported	Gap
`systemExtraLarge`	Not supported on iPhone		iPad only	Conditional	n/a (iPhone-only app)	n/a
`accessoryRectangular`	160 × 72	172 × 76	Lock Screen	3 lines, refresh (proposed)	Shipped, tap only	Compliant
`accessoryCircular`	72 × 72	76 × 76	Lock Screen	Route over value, no refresh (decided)	Not supported	Gap
`accessoryInline`	234 × 26	257 × 26	Lock Screen	Stop · route · value	Shipped	Compliant

Rendering modes

Full colourHome Screen in light or dark, StandBy and CarPlay with the background removed. We use containerBackground(.background, for: .widget). Compliant

Accented / tinted / clear (iOS 18 / 26)The system removes the background and tints or glasses the content. The app has no widgetAccentable or rendering-mode handling, so the CTA route fills fall back to the default conversion. Gap

VibrantLock Screen, and StandBy in low light. Text is desaturated and the night mode is red. Status is already a word (Due / Delayed), never colour alone. Compliant

Live Activities

Presentation	HIG size / rule	v3 (approved 2026-10-01)	App today	Status
Lock Screen / banner	371 × 84–160 pt on a 402 pt-wide phone, with a 14 pt standard margin	Header, freshness, up to 3 arrivals, refresh in a 44 pt target	Up to 3 arrivals, a status line when stale or failed, `activityBackgroundTint(systemBackground)`. No refresh button yet.	Compliant
Compact	230 × 36.67 (6.3″) · 250 × 36.67 (Air / Max), leading + trailing	Route badge · value	Route badge · time	Compliant
Minimal	36.67–45 × 36.67	Value or Stale, at most 4 characters	Time, or Stale	Compliant
Expanded	371 × 84–160, corner radius 44	2 arrivals and a footer, centre region unused	Leading routes, trailing times, bottom info	Compliant
StandBy	Minimal first, then Lock Screen layout at 2×. The HIG suggests the default background.	Lock Screen layout. Must work in night red.	Sets an explicit `systemBackground` tint	Deviation
Watch Smart Stack / CarPlay	The system mirror, compact leading + trailing. CarPlay disables buttons.	Default mirror only (decided)	No `supplementalActivityFamilies`	Compliant
Updates	Keep content timely. Use push for updates while the app isn't running, and set `staleDate`.	Push updates planned	`pushType: nil`. Local updates only, with `staleDate` at the next minute + 30 s.	Gap
Badge text	Minimum text size 11 pt	Train circles without codes	7–8 pt fixed line codes inside train circles	Gap