
Kairn: AI Running Coach
Trail & marathon training plan
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Free
In-App Purchases
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About
Your AI running coach for trail and road, for your legs and your mind.
Kairn builds your training plan around your race, from 10K to ultra-trail: running, strength and mental training in one plan. Kai, your AI coach, adjusts it every week to your form, your schedule and your watch.
A PLAN BUILT FOR YOUR RACE
Pick your race, your goal and your priorities, then tell Kai how many runs a week you can fit in, on which days, and when you do your long run. Kai builds your program week by week up to race day: intervals, easy runs, long runs, hill work for the trail, paces set from your goal on the road.
KAI READS YOUR COURSE
Map, elevation profile, hardest climbs and descents, aid stations: Kai spots what will cost you the most and prepares you for it. Set your target time and get your split at every aid station, with your margin on each cut-off. Race not in the app? Import its GPX.
RUNNING, STRENGTH AND MENTAL IN ONE PLAN
• Runs with clear blocks: warm-up, intervals, recovery, heart rate zones and paces
• Short strength sessions designed for runners, placed so they don't get in the way of your runs
• Mobility, cross-training and rest days
• Mental training in the same week: visualization, breathing, anchor phrases
• Mental cues in some runs, to put what you've trained into practice
YOUR SESSIONS ON YOUR WATCH
Send a run to your Apple Watch, COROS or Suunto in one tap and follow it block by block on your wrist. Your workouts, sleep and recovery come back to Kai from Apple Health, COROS, Suunto or Polar.
A PLAN THAT ADAPTS EVERY WEEK
Short nights, a busy week, a heatwave on Saturday: Kai reads your watch, listens to what you tell it and rewrites the sessions ahead. After each session, tell it how you felt. Change your rhythm anytime in your training preferences.
PLANNED VS DONE
Time, distance, elevation gain and pace, week after week: see what you planned and what you actually ran.
MENTAL PREPARATION, THE KAIRN DIFFERENCE
Your legs may be ready, but stress, doubt or a start that's too fast can ruin a race. Kairn trains your mind too, with short, practical exercises designed for runners:
• Manage pre-race stress
• Build your confidence
• Visualize the key moments of your race
• Master your start and your pace
• Stay focused when the effort gets hard
• Face doubt and the fear of cracking
• Debrief your race to keep improving
Take the mental profile test, designed with mental performance experts, to find your strengths and what to work on: confidence, focus, stress management, motivation and resilience.
KAI, ALWAYS BY YOUR SIDE
Write to Kai or send a voice message whenever you need to: a question about a session, a dip in motivation, pre-race nerves. Kai also checks in on its own at key moments and debriefs your runs with you.
Add your program to Apple Calendar or Google Calendar: every session on its date, updated whenever Kai adjusts your plan.
Kairn is free to download, with a free trial. A monthly or yearly Kairn Premium subscription unlocks the whole plan.
Kairn does not replace medical advice. Listen to your body: if anything hurts, stop and see a health professional.
Train your body. Train your mind. Run your best race.
Privacy policy: https://kairn.co/privacy-policy
Terms of use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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What's New in Kairn
3.0.2
November 14, 2026
What's new: • Link your Garmin watch and send your runs to it • Your program now comes in periods up to race day: see each one from the start, with its dates and goal • Kai details the coming weeks as you go, based on what you actually ran • A 5K time trial to set your paces: enter your time in the session • Two new questions when you create your program: how long you've been running, and your injuries • Bug fixes and stability
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Subscriptions & In-App Purchases
Monthly
Monthly
$12.991 Month
Price Updates
November 14, 2026→$12.99
October 24, 2026→$8.90
July 25, 2026→$3.90
May 4, 2026→$8.90
January 15, 2026→$8.90






