Why a simple daily score is more useful than it looks

Mood fluctuates for reasons that are easy to forget by the end of the week, sleep, workload, a difficult conversation, the weather. A single number logged each day, alongside a short note, builds a record you can look back on. On its own a single entry says little, but a run of entries over several weeks can show a pattern that daily memory alone would miss, such as a dip that repeats on the same weekday or after a run of short nights.

Reading the chart

The line joins your last 30 logged days, plotted from a score of 0 at the bottom to 10 at the top. A flat line near the middle usually reflects a settled period. A downward run across several consecutive days is more informative than any single low score, since one bad day is common and expected. Use the optional note to record what stands out, a change in sleep, a stressful event, or a change in routine, so that later entries carry some context rather than a number alone.

One entry per day, by design

Saving again on a day you have already logged updates that day's entry rather than adding a second one. This keeps the chart readable and avoids the record being skewed by logging the same day several times. If you want to log how you felt at a specific past date, there is no backdating field, this keeps the tool simple and the data honest to when it was actually recorded.

Privacy: your data never leaves your browser

Every entry is written to your browser's local storage and stays on your device. Nothing is sent to a server, there is no account, and no export happens automatically. Clearing your browser data, switching devices, or using a private window will remove or hide the history, so treat this as a personal, local log rather than a backed-up record.

This tool is not a medical device and does not diagnose, treat, or monitor any mental health condition. It does not replace professional psychological or psychiatric care. If you are experiencing significant distress, persistent low mood, or thoughts of harming yourself, contact a GP, a mental health professional, or a helpline such as Samaritans (116 123 in the UK) without delay.