Milebound is in development — coming soon to iPhone.
Radius alerts for iPhone

Set a radius.
Get the alert.

Drop a pin, choose a radius in miles, and Milebound tells you the moment you cross your boundary — or get close to it.

Coming soon to theApp Store See how it works
No account, on-device Up to 500-mile radius iOS 26
Milebound map showing a 150-mile circle over four states
Milebound home screen with the terminal circle and saved places
Crossed into Home Terminal
Inside the 150 mi radius · now
Built for big boundaries

From a city block to five hundred miles.

Set a circle around anywhere that matters — home, a terminal, a trailhead, a marina — at whatever size fits, from a tenth of a mile to 500. It stays accurate the whole way out.

Drag the radius — the map zooms with it, from a few city blocks all the way out to across state lines.

20 mi radius
Your pin
City scale · across town
Inside the circle = within your boundary
Drag to set your radius
0.1 mi · a city block 500 mi · a region
How it works

Three steps. About a minute.

Drop a pin, set a radius, and Milebound watches the boundary for you.

1
Drop a pin

Search a place or drop a pin anywhere on the map.

Searching for a place on the Milebound map
2
Set a radius

Anywhere from a tenth of a mile to five hundred.

Setting a 3-mile radius with the radius picker
3
Get the alert

Cross in or out, or just get close, and Milebound tells you.

A crossing alert: Crossed into Mom's House
What it does today

What Milebound does.

Crossings & proximity alerts

Alerts that fit how you move.

Cross a boundary and Milebound tells you the instant it happens — in or out. Want notice before you reach it? Add a proximity alert at 15 miles out. It alerts only on a real crossing, never on a GPS twitch.

Crossing in / out Proximity alerts Per-circle control
Alerts screen: crossing toggles and a 15-mile proximity alert
15 mi out
while inside, heading out
Zones

Find what's nearby.

Pull up fuel, rest stops, medical, public lands, and more around you — each on the map with its own icon. Set a proximity alert and Milebound tells you as you get close.

Fuel & charging Rest stops Medical
Zones: fuel stations shown as pins on the map, with the category picker
Distance tool

Measure the distance, your way.

How far is that, really? Measure straight-line ("as the crow flies"), by road, or on foot — to a circle's edge or its center — with travel time.

Distance tool measuring 9.2 miles from the dock, straight line over water
9.2 mi
straight line · over water
Background engine

Always on, easy on battery.

Milebound watches in the background and sips battery — precise GPS kicks in only when you're near a boundary. It even re-arms itself after a restart, so it never misses a crossing or alerts twice.

The 150-mile circle drawn over four states
More in Milebound
Live distance
See how far you are from every circle's boundary, inside or out.
Activity log
Every crossing is logged. Export it to CSV, or your places to JSON.
Private by design
Your circles and history stay on your iPhone, measured on your device.
Quiet hours
Silence alerts or pause tracking on a nightly schedule.
Lock Screen & Dynamic Island
Track your distance to the nearest boundary without opening the app.
iCloud backupPRO
Save your places to your own iCloud and restore them on a new iPhone.
Calendar syncPRO
Add each crossing to a calendar you choose.
Shortcuts & Siri
Check a distance, or whether you're inside a circle, hands-free.
Made for the way you move

Whatever you're keeping an eye on.

Four people, four radii — 150 miles to three. The spread is the point.

Marcus
On the road
150 mi
RADIUS

"I set my radius once. Now the truck tells me when I'm near my line — I don't watch the map."

Marcus's 150-mile circle over four states
Tom
On the water
12 mi
RADIUS

"I know my range. It tells me when I'm getting near it, so I turn back before I push my luck."

Tom's 12-mile safe range over the Gulf
Elena
Around town
5 mi
RADIUS

"I cross into her five-mile circle and I get the nudge — time to call and say I'm almost there."

Elena's 5-mile circle around her mom's neighborhood
Dana
On the trail
3 mi
RADIUS

"It keeps me honest about turnaround time — a heads-up before I've gone too far to make it back easy."

Dana's 3-mile circle in Pisgah
And anyone with a radius to watch:
RV & road trips Field service & real estate Cyclists & runners Hunters Travelers "Text me when you're almost home."
Why Milebound

What Milebound is good at.

Up to 500 miles
Set a radius from a tenth of a mile to five hundred, at true distance.
Proximity alerts
Get told before you reach the boundary, not only after you cross.
Background-reliable
Watches even when closed, survives reboots, and never alerts twice.
Straight-line first
Distance as the crow flies, with road and walking one tap away.
Private
Your circles and history stay on your iPhone, measured on your device.
iOS 26 native
Liquid Glass cards over an Apple-Maps-style map. Light, airy, lots of map.
On the roadmap We're just getting started.
Apple Watch Shared circles

In development — not yet available. Features and timing may change.

Questions

Good to know.

Milebound

Set your first circle in under a minute.

Milebound is coming soon to iPhone — a free download when it lands.

Coming soon to theApp Store Free to start · iOS 26 or later