Heliodos

Heliodos is a science & education application developed by Daniel Kraft, packaged as a single Android APK of version 1.0 weighing in at 3.27 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.

1. Only download through the button on this page — never from third-party mirrors or shortened links, which are the most common way malware spreads.
2. File size is a light 3.27 MB, so it installs quickly even on modest connections.
3. This build is signed by "Daniel Kraft" — always verify the developer name matches what's listed on the app's official store page before installing an update.
4. 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.
5. 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.

• AR sun and moon trajectories: The sun's path for the solstices, the equinox, and the current moment — plus the moon's current trajectory — are drawn directly over the live camera image, with hour tick marks and time labels on the current paths.


• Customisable paths: Toggle individual paths on or off and pick custom colours for each in the settings.


• Flexible location: Uses your GPS location automatically, or lets you set any place on Earth manually.


• Custom time: Simulate the sun's position at any time of day, not just right now.


• Camera selection: Pinch to zoom to cycle through available back cameras (wide-angle, normal, telephoto).

• Gardening: Find out which spots get full sun in summer versus winter before you plant.


• Real estate: Check how much natural light a room or terrace receives throughout the year.


• Architecture & construction: Plan shading, windows, and solar panels with real-world sun data.


• Photography: Scout locations and predict golden-hour angles in advance.

Is Heliodos 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 Heliodos require?
Android 4.1+ or newer. Installing on older devices may cause crashes or refuse to install.

Is Heliodos safe to install?
We link to the exact APK published by Daniel Kraft. 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 Heliodos?
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.

1. Tap the Download APK button above and save the file to your device.
2. 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.
3. Open the downloaded eu.domob.heliodos.apk file from your Downloads folder.
4. Tap Install and wait for Android to finish.
5. Open «Heliodos» by Daniel Kraft and grant only the permissions it actually needs.
6. 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.