Calyx - Grow Tracker

Calyx - Grow Tracker is a science & education application developed by Gurkenwerfer, packaged as a single Android APK of version 1.2 weighing in at 14.5 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 14.5 MB, so it installs quickly even on modest connections.
3. This build is signed by "Gurkenwerfer" — 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.

Calyx tracks indoor garden environments, plant schedules, and hardware. Commercial alternatives lock features behind cloud subscriptions and isolate data from local smart devices. Calyx stores its 30,000-strain database entirely offline and integrates directly with Home Assistant to control grow room sockets without a monthly fee.

Environment and hardware control

The application queries the Home Assistant REST API to display temperature, relative humidity, and Vapor Pressure Deficit (VPD). Users toggle smart sockets directly from the application interface. Calyx also monitors for light bleed during scheduled dark periods and pushes an alert if it detects illumination.

Plant and tent management

Users define physical grow tents and assign plants to them. The application references an offline database of 30,000 strains. When a user logs a plant, an automatic calculator uses the strain genetics to determine the optimal harvest window. Growers capture and view chronological photos in a full-screen gallery overlay, which renders the days since germination and current growth phase on the image.

Feeding and scheduling

The application provides a nutrient solution recipe database to store feeding mixtures. Users assign custom quick actions, such as pruning or nutrient application, to individual plants. Tapping a nutrient action automatically attaches a specific recipe and liquid volume to the plant's history. A soil moisture reading below 30% places a watering indicator on the calendar.

Standalone and self-hosted options

The application runs as a standalone tool, writing records to a local SQLite database. Growers who require multi-device synchronization can deploy the provided Docker container to connect the application to a self-hosted backend.

Is Calyx - Grow Tracker 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 Calyx - Grow Tracker require?
Android 4.1+ or newer. Installing on older devices may cause crashes or refuse to install.

Is Calyx - Grow Tracker safe to install?
We link to the exact APK published by Gurkenwerfer. 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 Calyx - Grow Tracker?
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 com.gurkenwerfer.calyx.apk file from your Downloads folder.
4. Tap Install and wait for Android to finish.
5. Open «Calyx - Grow Tracker» by Gurkenwerfer 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.