Kardiacs

Free phone ride app that now rides any route in 3D on your trainer, with real grade, wind and surface

Innovation: the day's forecast wind and the road surface feed into trainer resistance

Indie

Download on the App StoreGet it on Google Play

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Zion Canyon ridden indoors in Kardiacs: the road up the canyon in 3D, with power and heart rate in zone 1, speed and grade.
Kardiacs · kardiacs.com
Structured indoor rides in Kardiacs sorted by intensity, with interval charts and target power.
Kardiacs · kardiacs.com

2 screenshots. Scroll or swipe sideways.

About

Kardiacs is an all-in-one ride app for iPhone, iPad, Apple Watch and Android (offline maps, group voice between phones, workouts, recovery) that added indoor route rides in November 2026. Pick your own GPX, a route planned in the app or one of 300+ in the library and ride it in a 3D world built on the phone from map, elevation and satellite data. The trainer runs in simulation mode with the route's grade plus the day's forecast wind, extra rolling resistance on gravel and dirt, aero drag from your height and bike, and slowing for tight bends; a hill-feel slider turns climbs down without changing your speed on the route. ERG control and structured workouts, also while riding a route; rides are saved as FIT files. Needs a Bluetooth FTMS or Wahoo trainer. No other riders in the world yet; group rides are planned. Free with ads, no account needed. Made by Marcus Gilchrist (Kardiacs LLC).

Features

  • ERG mode
  • Workouts
  • Routes
  • Own routes

Sends rides to

  • Apple Health
  • Health Connect
  • Any tracker, by file (FIT, TCX…)

Other sports

  • Treadmill
  • Strength
  • Walking

In these lists

Changelog

  1. Version 26.11.2App Store

    • Regional 3D worlds with local trees, roofs, rock, roads, bridges and water
    • Graphics levels from Low to Ultra that step down to hold 60 fps
    • Free rides with no route, steering with a controller or iPhone at junctions
    and 15 more changes

  2. Version 26.11.1App Store

    • Indoor route rides rebuilt as a 3D world with satellite imagery, terrain and buildings
    • ERG pauses when you stop pedalling and picks up when you pedal again
    • FIT exports upload to Strava, including older rides, named by date and session
    and 10 more changes

  3. Version 26.10.4App Store

    • Share studio makes cards and videos from rides, with photos and live stats
    • Routes library of famous climbs and races, rideable indoors or outdoors
    • Goals set on the Calendar in five steps, with a plan sized to your history
    and 16 more changes
7 older updates

  1. Version 26.10.1App Store

    • Fixes for crashes when starting a ride or searching Directions stops in big cities
    • Imported activities longer than a week keep their first seven days, with a note
    • Bug fixes and performance improvements

  2. Version 26.9.4App Store

    • A new look with the map as the page and sessions drawn in black for sunlight
    • iPad landscape layout on every screen, with numbers in the corner beside the map
    • Spoken turns name the road and combine turns that come close together
    and 8 more changes

  3. Version 26.9.3App Store

    • Walk or Hike on the sport picker, scored on foot and paced as a walk
    • Runs targeted against your own critical speed, fitted from your runs
    • Calendar of every ride, run and walk, with the fitness curve beneath each month or week
    and 14 more changes

  4. Version 26.9.2App Store

    • Offline maps for any place on Earth, found by search and with no download cap
    • Rides written down as they happen, so a crash or flat battery no longer loses them
    • Sixteen more languages, 23 in all, including Chinese, Korean and Arabic
    and 11 more changes

  5. Version 26.9.1App Store

    • Group rides joined by QR code, with shared map, end-to-end encrypted voice and chat
    • Speech to chat: what you say while unmuted is written down and sent as a message
    • Spoken turn-by-turn cues, including when to get off and walk a bike route
    and 18 more changes

  6. Version 1.2App Store

    • Long-press a café, park or bike shop on the map to make it a route stop
    • One-tap water and restroom stops beside Play and Stop, routed to the nearest
    • Turn-by-turn cues you can feel, with the phone buzzing at a junction
    and 6 more changes

  7. Version 1.1App Store

    • New, easier-to-use interface
    • Watch mirrors the route and workout, with offline turn-by-turn navigation
    • Satellite imagery layer, on by default on dirt or gravel
    and 1 more change

Summarized by AI from the published release notes; the link has the full notes. Checked 14 Nov 2026.

Sources

Something wrong or out of date? Suggest a correction.

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  • OudenaiPhone app to ride your own GPX/FIT/TCX routes and race your ghost
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