Restoring Aethr Pro
Aethr Pro is a one-time purchase tied to your Apple Account. On a new or reset iPhone, sign in with the same Apple Account and restore the purchase from the Aethr Pro screen in the app.
Aethr Support
How can we help?
Answers to common questions, and a direct line to the two people who build Aethr.
- Requires
- iPhone with iOS 26.5 or later
- Optional
- Apple Watch with watchOS 26.5 or later
- Languages
- EN · CS · DE · ES · IT · PL · SK
Getting started
- 01
Install Aethr
Download Aethr on your iPhone. If you have an Apple Watch, the watch app installs alongside it.
- 02
Allow Apple Health access
On first launch, allow Aethr to read your workouts, heart rate and sleep. Aethr needs this to compute anything.
- 03
Let the first sync finish
Aethr analyses your workout history on the device. With years of workouts this can take a few minutes.
- 04
Set your thresholds
In Records, add your max heart rate, threshold heart rate, FTP or threshold pace for more accurate load and zones.
Troubleshooting
My workouts do not appear
Open the iPhone Settings app, go to Health, then Data Access & Devices, then Aethr, and make sure workouts, heart rate and routes are allowed. Then open Aethr and tap Settings, then Sync now. Workouts recorded by other apps appear only after those apps have saved them to Apple Health.
A Garmin, Polar or Suunto workout has no map or power
Many watch brands send only a summary to Apple Health, without the GPS route, power or running dynamics. Export the original FIT file from the brand's app and open it in Aethr, or tap Settings, then Import workout files. Aethr saves the full workout to Apple Health and hides the summary-only duplicate.
Load, zones or power look wrong
Check your profile and thresholds in Records and Settings, then run Settings, then Rebuild analytics. Aethr recomputes everything from Apple Health. Your raw health data is never changed.
How does estimated cycling power work?
For rides without a power meter, Aethr can estimate power from speed, gradient and the total weight of you and your bike. Turn it on in Settings, then Cycling power. Rides need a GPS route, and a real power meter always takes priority.
The Apple Watch app is missing
Open the Watch app on your iPhone, scroll to Available Apps and tap Install next to Aethr. Watch workouts are saved to Apple Health and appear in Aethr on the iPhone after the next sync.
Change units or language
Units are in Settings, then Units: automatic by region, metric or imperial. To change the language, tap Language in Aethr's Settings; it opens iOS Settings for Aethr.
Weather is missing on a workout
Weather is added for outdoor workouts with a GPS route and needs a network connection at sync time. You can also turn weather off in Settings.
Purchases
Refunds
Purchases are processed by Apple, so refunds are handled by Apple too. Request one at reportaproblem.apple.com.
Family Sharing, no subscriptions
Aethr has no subscription, ever. Aethr Pro supports Family Sharing, so everyone in your Apple family group gets it with one purchase.
Frequently asked
Do I need an Apple Watch?
No. Aethr reads workouts from Apple Health, whichever app or watch recorded them. The Aethr watch app is optional.
Does Aethr record workouts on the iPhone?
No. The iPhone app analyses workouts. Recording happens on Apple Watch, with the Aethr watch app, the Workout app or another watch.
What is free and what is Pro?
Recording and reliving any single workout is free forever: the watch app, full workout detail, personal bests, sharing and one gear item per sport. Aethr Pro (€11.99 once) unlocks the layer that reads across weeks: Trends, the monthly summary, advanced records, readiness guidance, unlimited gear and file import.
Do I need an account?
No. There is no sign-up, no email and no password. Aethr works offline except for weather and maps.
Where is my data stored?
Your workouts stay in Apple Health. Aethr stores only the analytics it computes, on your iPhone. Delete the app and they are gone. See the Privacy Policy for details.
Which sports are supported?
Running, cycling, hiking, walking and skiing on the iPhone; run, cycle, hike, walk, intervals and sprint sessions on Apple Watch.
Which languages are available?
English, Czech, German, Italian, Polish, Slovak and Spanish.
Is Aethr medical advice?
No. Aethr is a fitness and training tool, not a medical device. Talk to a doctor about any health concern.
Shape what we build next
Still stuck? Write to us.
Aethr is made by a two-person team in Bratislava. Feature requests go straight to the people writing the code, and plenty of what is in the app today started as one.
Prefer email? info_aethr@kaslbi.com