Cairn: Health Aggregator

6 Downloads 14 Views v0.3 17.73 MB 4.1+

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(17.73 MB)

Editor's Overview

Cairn: Health Aggregator is a sports & health application developed by Max Fiedler, packaged as a single Android APK of version 0.3 weighing in at 17.73 MB. The package targets Android 4.1+ and above. Below you'll find the publisher's own description, a quick spec sheet, and a short buyer-beware checklist so you know exactly what you're installing before tapping download.

Install Checklist

Only download through the button on this page — never from third-party mirrors or shortened links, which are the most common way malware spreads.
File size is a light 17.73 MB, so it installs quickly even on modest connections.
This build is signed by "Max Fiedler" — always verify the developer name matches what's listed on the app's official store page before installing an update.
After install, Android may prompt you to allow "Install from unknown sources" — approve only this one install, then revoke the permission in Settings > Apps > Special access.
We link directly to the APK file or the publisher's repository; we do not modify the binary. Always run a virus scan after any sideloaded install.

About this app

Cairn reads your health and fitness data from the phone's health store — Apple
Health on iOS, Health Connect on Android — and saves it as plain, open-format
files (Open mHealth / IEEE 1752.1 JSON) in your own Nextcloud. You stay the sole
owner of your data: there is no central server and the developer stores nothing.

Requirements:

* Android 14 or newer. Cairn reads through Health Connect, which is part of the
system only from Android 14; on Android 8-13 it is a separate Google app from
the Play Store, which a Play-less device cannot install — so the app would
find nothing to read.
* A Nextcloud of your own is optional: without one, Cairn still reads and shows
your data, it just keeps the files on the phone.

Features:

* Reads heart rate, steps, body weight, sleep and workouts — read-only. Cairn
never writes to your health store.
* Syncs the files to your own Nextcloud over WebDAV, with optional background
sync.
* In-app dashboard with a sleep-stage deep-dive and a BMI computed from your
latest weight.
* Available in English and German.

Privacy:

* No advertising, no analytics, no trackers, no third-party services.
* Your data lives only on your device and in the Nextcloud you control — never
in any developer or third-party cloud.
* HTTPS only. The Nextcloud app password is stored in the operating system's
secure storage and can be revoked at any time.

Cairn is an aggregator and viewer, not a medical device. It makes no diagnostic
or treatment claims.

Details

Version	v0.3
Size	17.73 MB
Developer	Max Fiedler
Category	Sports & Health
Package	com.luminaapps.cairn
Android	4.1+
Last Updated	Oct 29, 2026
Downloads	6

Frequently Asked Questions

Is Cairn: Health Aggregator free to download?
Yes. The APK file linked from this page is free. The developer may offer in-app purchases once installed, but obtaining the installer itself costs nothing.

What Android version does Cairn: Health Aggregator require?
Android 4.1+ or newer. Installing on older devices may cause crashes or refuse to install.

Is Cairn: Health Aggregator safe to install?
We link to the exact APK published by Max Fiedler. We do not modify the file. Still, as with any sideloaded app, scan it with a reputable antivirus before opening it, and only grant permissions the app genuinely needs.

How do I update Cairn: Health Aggregator?
Install the newer version on top of the old one — Android will keep your data. If the signature differs, uninstall first (you may lose local progress).

Why is the app not installing?
Common causes: not enough storage, an older Android version than 4.1+, or a conflicting build already installed. Free up space, check your OS version, and uninstall any previous copy before retrying.

How to Download & Install Cairn: Health Aggregator

Tap the Download APK button above and save the file to your device.
Open your device Settings → Security (or Apps → Special access → Install unknown apps) and allow your file manager or browser to install unknown apps for this one file only.
Open the downloaded com.luminaapps.cairn.apk file from your Downloads folder.
Tap Install and wait for Android to finish.
Open «Cairn: Health Aggregator» by Max Fiedler and grant only the permissions it actually needs.
Revoke the "unknown sources" permission once you are done installing.

Note: this page hosts or links to the installer only. The application name, icon and description are provided for identification. All trademarks belong to their respective owners.