Editor's Overview
Mood Cairns is a mental health application developed by lcdcode, packaged as a single Android APK of version 1.0 weighing in at 24.56 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 24.56 MB, so it installs quickly even on modest connections.
- This build is signed by "lcdcode" — 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
Features
* Custom scales. Five built-in scales (Happiness, Anxiety, Stress, Boredom, Pain), each numeric and color-tagged. Add your own; archive the ones you don't want.
* Prompt windows. Define time-of-day windows (e.g. morning 08:00-12:00, evening 18:00-20:00). The app fires one notification per window per day at a randomized time inside it. Tap the notification to jump straight to the log entry screen.
* History and charts. Browse past entries, see per-scale trends over time.
* Encrypted on-disk storage. The mood database is encrypted at rest using SQLCipher. The key lives in memory only while the app is unlocked, and is wiped when you lock it.
* PIN + biometric lock. PIN-gated app entry, with optional biometric unlock. PIN is hashed with PBKDF2-HMAC-SHA256 (600k iterations) before being stored.
* Encrypted backups. Manual export writes an AES-GCM-encrypted JSON file to Documents/MoodCairns/. The encryption key is derived from your PIN with PBKDF2-HMAC-SHA256 (200k iterations) and a fresh per-backup salt embedded in the envelope, so any install (including a fresh one) can decrypt with the same PIN.
* Home-screen widget for one-tap mood logging.
Privacy contract
The app declares no network permissions. Without internet, the process literally cannot open a socket, which makes phone-home impossible regardless of what any included library tries to do.
The build enforces this, so a network permission can never be silently introduced by a dependency update.
If you want backups synced off-device, point Syncthing (or any file manager that can sync a folder) at Documents/MoodCairns/.
Contact
The best way to get in touch for issues, feature requests, etc. is the Issues page on github.com/lcdcode/mood-cairns. I will usually respond within 3 business days.
Source
Fully open source under GPL-3.0-only. Built on Kotlin, Jetpack Compose, Room, SQLCipher, and AndroidX.
Details
| Version | v1.0 |
|---|---|
| Size | 24.56 MB |
| Developer | lcdcode |
| Category | Mental Health |
| Package | com.lcdcode.moodcairns |
| Android | 4.1+ |
| Last Updated | Oct 29, 2026 |
| Downloads | 7 |
Frequently Asked Questions
Is Mood Cairns 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 Mood Cairns require?
Android 4.1+ or newer. Installing on older devices may cause crashes or refuse to install.
Is Mood Cairns safe to install?
We link to the exact APK published by lcdcode. 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 Mood Cairns?
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 Mood Cairns
- 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.lcdcode.moodcairns.apkfile from your Downloads folder. - Tap Install and wait for Android to finish.
- Open «Mood Cairns» by lcdcode 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.
