Tideline is a quiet, private mood journal built for people in therapy who want to understand their emotional patterns without sacrificing privacy. Every check-in, insight, and memory stays on your device — we never send your mood data to a server, and you stay in complete control of your story.

At its heart, Tideline uses Ecological Momentary Assessment (EMA) to help you capture how you feel in the moment, not hours later when memory has already smoothed the edges. A gentle, random notification schedule (three to five nudges a day, only during the hours you are awake) reminds you to pause and check in. Each check-in takes about ten seconds: simply slide a single mood scale from −100, through your personal neutral comfort zone at 0, up to +100, add a short note about what was happening, and save. That is it. No endless questionnaires, no clinical jargon, no pressure.

The tracker then turns those small moments into clarity. Switch between day, week, and month views to see how your mood moves over time, and use the archive to revisit any previous month so your progress is never lost. A simple “mood balance” readout shows the percentage of time you have spent below, at, or above your neutral zone, making it easy to spot where your wellbeing is highest and where you may need extra support.

When it is time to share with a therapist or simply reflect, Tideline can generate a clean, printer-friendly monthly summary with your trend graph included. A privacy mode lets you strip out any personal details before sharing, so you can hand over the picture without handing over your identity.

Tideline also understands that mental health tools must feel safe, not overwhelming. The home screen offers a calm, soft design, a rotating inspirational quote, and immediate access to crisis support — Samaritans, NHS mental health support, and SHOUT — because reaching out should always be one tap away.

Whether you use Tideline in your browser, install it as a progressive web app, or run it as a native Android app, the experience is the same: your data stays local, your notifications come from your phone, and your journey stays yours.

Tideline is not a diagnosis tool and does not replace professional care. It is a gentle companion for the days in between appointments, helping you notice, name, and navigate your moods — one small check-in at a time.