Support

Need help with something?
Email support@kardiacs.com and we'll get back to you, usually within two business days.

It helps to include your device model, iOS or watchOS version, and — if a sensor or trainer is involved — its make and model.

Requirements

Common questions

My trainer, treadmill, or heart-rate strap won't connect

iPhone	iOS 18.0 or later
Apple Watch	watchOS 11.0 or later (optional; the iPhone app works on its own)
Age	16 or older
Android & Wear OS	In development — not yet released

Kardiacs talks to fitness equipment over Bluetooth, so start there: make sure Bluetooth is on, and that Kardiacs has Bluetooth permission in Settings → Kardiacs. Most trainers and sensors will only pair with one app at a time — if the device is still connected to another app, your bike computer, or the manufacturer's own app, close that connection first. Waking the sensor (start pedalling, or damp a heart-rate strap's contacts) also helps, since many stay asleep until they detect activity.

Apple Health data isn't showing up

Kardiacs reads age, weight, heart rate, HRV, VO₂max and cycling FTP to set up your profile and training zones, and writes workouts back. Health permissions are per-category and can't be re-requested by the app once set, so check them in Settings → Health → Data Access & Devices → Kardiacs and enable anything that's off.

Routes and navigation

Outdoor routing and turn-by-turn guidance need location permission. For recording that continues while your phone is locked or you're using another app, choose Always in Settings → Kardiacs → Location. Route quality varies with the underlying map data — if a route sends you somewhere wrong, send us the route and we'll take a look.

Strava and Spotify

You can connect and disconnect these under Settings → Connected Services in the app. Disconnecting deletes the stored access tokens. If a connection stops working, disconnecting and reconnecting re-authorizes it, which resolves most cases.

Your data

You can delete individual activities, workouts, and routes in the app, and export activities as FIT files.

To delete your whole account, open Profile in the app and tap Delete Account — or, on the web dashboard, open Preferences and use Delete Account at the bottom. Either one runs the same deletion. This is permanent and immediate: it removes your account along with your activities, routes, workouts, health history, and any connected-service tokens. It can't be undone, so export anything you want to keep first.

We remove personal data from production systems within 30 days and from backups within 90 days, except where law requires longer retention. See the Privacy Policy for the full picture.

If you can't sign in to reach the button, email support@kardiacs.com from the address on your account.

Reporting a bug or asking for a feature

Email support@kardiacs.com. For bugs, what helps most is what you did, what happened, and what you expected — plus roughly when it happened, so we can line it up with our logs.