Private, fully offline mood tracker. No network access. Your data's yours..
About this app
A private, fully offline Android mood tracker. Log how you're feeling against your own scales, in your own time windows, on your own device. Nothing is ever uploaded - sync, if you want it, is your job (Syncthing works well on the encrypted backup folder).
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/.
Source
Fully open source under GPL-3.0-only. Built on Kotlin, Jetpack Compose, Room, SQLCipher, and AndroidX.
Licensed under GPL-3.0-only, by lcdcode.
What's New in v1.0.7
Imported from the F-Droid repository index.
- - Search notes and filter History by date or prompt slot.
- - Add "Change date/time..." when manually logging or editing an entry, so you can record a mood for a past date and time (for example, one you missed).
- - Minor security patches.
Version history
Jul 15, 2026 · 24.6 MB · Android API 29–34 · code 8
Imported from the F-Droid repository index.
- - Search notes and filter History by date or prompt slot.
- - Add "Change date/time..." when manually logging or editing an entry, so you can record a mood for a past date and time (for example, one you missed).
- - Minor security patches.
SHA-256 f1bc158f5ae34b7092f6f051fe3e3d620b2db7c67f3b52ec40cf903731a9093c
Jul 3, 2026 · 24.6 MB · Android API 29–34 · code 7
Imported from the F-Droid repository index.
- - Slightly updated main icon
- - New monochrome icon
SHA-256 51a6f8f7f3ac57c02fffee1f0c017d8a735c481b4ad80ebc030c9ec8242da487
Jun 26, 2026 · 24.6 MB · Android API 29–34 · code 6
Imported from the F-Droid repository index.
- - UI performance improvements to help avoid crashes on less powerful devices.
- - Add Tag selection to Entry screen for re-tagging during logging or editing an entry.
- - Fix scale color selection overflow.
- - Allow deletion of user-made scales.
- - Allow option to set up without PIN / remove PIN (with warning!)
- - Fix "ghost" notifications left over after prompt window deletion/deactivation.
SHA-256 f487e1d761764f7d638417ca0a7fb73d819240d64eee9627617f0277845e6b8e
Will it run on your device?
69%
- Targets newer Android builds, so legacy devices may be excluded.
- Multiple CPU architectures are covered.
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.lcdcode.moodcairns 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, 1.0.6 is the last build before it. Android will not install an older version code over a newer one, so you must uninstall Mood Cairns 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 Mood Cairns, and a listing is removed when the evidence for it stops holding up.
Get Mood Cairns
Every source we list for com.lcdcode.moodcairns 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
f1bc158f5ae34b7092f6f051fe3e3d620b2db7c67f3b52ec40cf903731a9093c
Signing certificate
493609b8137babcda2d59684cda7112fcc7eb52e9d32ddda8d74f857ef13151b
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.
Report a problem with this listing
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