Track indoor gardens, plant schedules, and hardware entirely offline.
About this app
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.
Licensed under GPL-3.0-or-later, by Gurkenwerfer.
What's New in v1.3.0
Imported from the F-Droid repository index.
- - Reimplemented complete Offline Sync system
- - Added Standalone Mode
- - Fixed offline Tent, Plant, and Image creation
- - Implemented robust offline IndexedDB cache
- - Added automatic F-Droid metadata sanitizers
Version history
Jul 6, 2026 · 14.5 MB · Android API 24–36 · code 7
Imported from the F-Droid repository index.
- - Reimplemented complete Offline Sync system
- - Added Standalone Mode
- - Fixed offline Tent, Plant, and Image creation
- - Implemented robust offline IndexedDB cache
- - Added automatic F-Droid metadata sanitizers
SHA-256 f7e413700ac1cddf2e326be8c131e6a80126bf6605aa72569f89ac9133616099
Jul 4, 2026 · 14.5 MB · Android API 24–36 · code 6
Imported from the F-Droid repository index.
- - Fixed author metadata
- - Added version sync tool
- - Save watering presets
- - Fixed language selector bugs
SHA-256 4398efdd43570b9a540f9fc5f66e3ba736893e94387e693b74a635b2d6d367cc
Jun 24, 2026 · 14.5 MB · Android API 24–36 · code 5
Imported from the F-Droid repository index.
SHA-256 d2894bec690d36be97c3a4990d1d7716d9b72fa7900f74076e099fb076aadb91
Will it run on your device?
78%
- Runs on a broad range of modern Android versions.
- ABI coverage is focused on newer 64-bit devices.
- Aligned with the latest Android target SDK expectations.
Installation Guide
Open Settings on your Android device
Go to Security → Unknown sources (or Install unknown apps)
Enable "Allow from this source" for your browser or file manager
Open the downloaded APK file from your Downloads folder
Tap "Install" and wait for installation to complete
Launch the app from your home screen
Make sure to re-enable Unknown Sources restrictions after installation for security.
How to install this safely
How to verify the file you downloaded
Before you install anything, confirm the file is the one described here. On a computer, run shasum -a 256 your-download.apk (macOS or Linux) or certutil -hashfile your-download.apk SHA256 (Windows), then compare the output character-for-character with the SHA-256 on this page. If a single character differs, the file is not the build we recorded — delete it.
What the signing certificate proves
Every Android app is signed with a private key that only its developer holds. The fingerprint on this page is a hash of the matching public certificate, and it proves continuity rather than identity: it tells you a build came from whoever signed the earlier ones. Android enforces this at install time — if a package claiming to be com.gurkenwerfer.calyx is signed with a different key, the system will refuse to install it over your existing copy. A fingerprint that changes between releases is worth pausing on, because a repackaged app that has been modified by someone else cannot keep the original signature.
How to roll back to an earlier version
If the current release misbehaves, 1.2.4 is the last build before it. Android will not install an older version code over a newer one, so you must uninstall Calyx - Grow Tracker first — which clears its local data unless you have a backup. Reinstall the older APK only if its signing fingerprint matches the build you already trust, and check the API range: an older release may target an Android version your device has moved past.
Why we list sources instead of hosting everything
The official store channel is almost always the right choice: it updates automatically and carries the publisher's own distribution guarantees. A direct APK is useful when a device has no store access, when a rollout has not reached your region, or when you need a specific version — and only when the publisher has authorized that copy. APKBrowse does not list pirated, cracked, or unauthorized rebuilds of Calyx - Grow Tracker, and a listing is removed when the evidence for it stops holding up.
Get Calyx - Grow Tracker
Every source we list for com.gurkenwerfer.calyx is legality-reviewed. Pirated or cracked builds are never offered.
Other sources
F-Droid listing
officialF-Droid builds this app from source and signs it. This is its official listing, with older builds and full release notes.
Source code
verified publisherThe upstream repository this build is compiled from.
We check legality and signature continuity, but device behaviour still varies. Install at your own discretion.
App Information
Security Verification
We record provenance; we do not run malware scans. Verify the hash yourself before installing.
SHA-256 Hash
f7e413700ac1cddf2e326be8c131e6a80126bf6605aa72569f89ac9133616099
Signing certificate
3cfc0f59063dd9e8cc56fcfac6302ee01c804de5c22701f4507591292469d551
Permissions Required
Previous Versions
The signing certificate fingerprint for this release is on record, so a build that does not match it did not come from this publisher.
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