The Yearly Comparator plugin creates a calendar-style interface that displays daily notes from different years side by side. It extracts summaries based on a configurable headline keyword, defaulting to [DAILY_SUMMARY], and arranges them in columns for each year. Users can customise column widths and toggle the comparator view with a ribbon button. This makes it easy to track habits, compare past entries, and reflect on yearly changes in your journaling or daily note-taking workflow.