Kardiacs

About this app

Kardiacs is your personal training partner for riding and running — indoors on your smart trainer or treadmill, outdoors on roads and trails. Every workout is personalized. Kardiacs models your fitness with Critical Power (CP/W′) and adapts power targets, pace targets, and heart-rate zones to you — built from your workout history, Apple Health, or a quick profile setup. MUSIC THAT MATCHES YOUR EFFORT • Control Apple Music without leaving your session • AI Workout Mixes: a playlist beat-matched to your cadence or stride, curated on device by Apple Intelligence • Queue playlists, favorite songs, and see what's up next OUTDOOR SESSIONS • Explore: discover loops near you that fit your workout, with turn-by-turn guidance • Commute: plan A-to-B routes and get where you're going • Live map with auto-follow and a full session recording • Walking with pacing that respects your age and fitness • Check the weather before or during your session. Routing and time estimates consider your fitness level, wind, elevation, and other environmental factors INDOOR TRAINING • Automatic trainer control (ERG): your workout drives the resistance on compatible Bluetooth smart trainers • Treadmill sessions with grade-adjusted pace targets • Live dashboard with power, pace, and heart-rate zone bars — your target bracketed so you always know where to sit • A structured workout library, resolved to your personal thresholds • Create your own sessions with the custom workout builder READINESS & PROGRESS • Track your fitness over time: Critical Power, W′, and VO₂max • Post-session summaries with charts of every metric • Long-press any zone card mid-session for a live history graph YOUR GEAR, ORGANIZED • Connects to Bluetooth trainers, treadmills, heart-rate monitors, and sensors • The Garage groups your bikes, shoes, and devices into kits for indoor and outdoor • Apple Watch companion app for wrist-based control and heart rate • Live Activity on the Lock Screen and Dynamic Island • Saves workouts to Apple Health Kardiacs is free to use, supported by ads. The optional Kardiac Supporter subscription removes every ad and downloads more of the map over Wi-Fi for offline use. Every training feature stays free, subscriber or not. Renews monthly; cancel anytime in your App Store subscription settings. Notes: Apple Music features require the Apple Music app (and an Apple Music subscription for full playback). AI Workout Mixes require a device that supports Apple Intelligence, with it turned on. Automatic resistance control requires a compatible Bluetooth (FTMS or Wahoo) smart trainer. Turn-by-turn guidance requires location access. You must be 16 or older to use Kardiacs.

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1. First observed Aug 19, 2026 · 4:52 PM Free