Walk, run, ride, MTB, ski & more
Cardio Trails records every outing, colors each path by how steep it is, and weaves everything you do into your own trail network — with your efforts, energy and heart rate on every segment. All of it private by default.
Apple Health support
Explore
Not a trail database. Not someone else’s routes. Every line on this map was drawn by your own feet, wheels or skis — and it gets richer every time you head out.
Teal on the flat, purple at 20% and beyond, with arrows pointing uphill.
Stretches you repeat merge into one segment, with junctions where paths meet.
Your ratings depend on the activity, the direction and the ground: badges show the one for today, normal, wet or very dry.
One activity type, your last outing or all of them — colored by slope, speed or heart rate.
Slope colors
Each stretch is colored by its grade: teal on the flat, yellow from 5%, orange from 10%, purple past 20%. Small arrows point uphill, so one look tells you which way it hurts.
8.4 km · ↗ 412 m
Trail network
Everything you record or import is merged on your iPhone into a single network. Stretches you repeat become one segment, junctions appear where paths meet, and every segment remembers what happened on it — separately uphill and downhill.
Recordings that follow the same path within a corridor you choose are traced onto one segment. Stand still for 15 seconds on new ground, and a junction is born where you hesitated.
How fast you covered a segment — or a whole stretch of them — each time: your best, and your progress.
Passes per activity type and direction, for every month over all the years.
Move, add, merge, split, join and delete points and segments, with undo and redo.
Energy & heart rate
Most apps guess from distance. Cardio Trails estimates active energy from your speed, the slope, the ground under each segment, your weight that day and the gear you carry — and switches to heart rate wherever your wearable measured it densely.
Avg 118 · held 151 bpm
Any wearable that saves heart rate to Apple Health counts. AirPods Pro give live estimates while you record; with other wearables, the heart-rate estimate comes at the end of the activity.
Difficulty & conditions
Rate each segment for each activity, uphill and downhill, in general and on wet or very dry ground. After rain, the map switches to your wet ratings on its own — Apple Weather tells it how much fell around you.
Normal ground: your general ratings.
18 activity types
Each activity type keeps its own paths, pass counts and difficulty ratings — and similar ones stand in for each other when a rating is missing, so walking borrows from running, and mountain biking from cycling.
Recording
Sixteen live figures on four pages: time and distance, speed, elevation, energy and heart rate. The page you left open follows you to the Lock Screen and the Dynamic Island.
Privacy
No account is needed, and all your paths and outings are private by default.
Read the privacy policyApple Health supportHealth data is read and written only with your permission, and never sold.Apple Health
Bring in the outdoor workouts other apps recorded, and send yours back with their routes and energy — only if you want to.
Tap to open, or press and slide down to pick in one gesture.
The map turns to your compass when you stand, and to your heading once you move.
+ and − buttons step half a level at a time: one hand zooms while the other stays on the handlebars, gloves on.
Normal, wet or very dry — preset from recent rain when you save.
Each activity keeps the weight you had then, from Health or the app.
A pack, a bike, skis: each type carries its own load.
Activities, distance, weight and heart rate, stacked by type.
Noting a segment’s soil or a late watch sync updates past outings.
A small arrow beside your dot shows where the phone faces.
Every outing by month, with a slope-colored route preview.
Follows your iPhone’s appearance, day or night.
The activity types you saved last come first, ready to start.
Download Cardio Trails and turn every outing into a map that’s truly yours.
Cardio Trails