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Calendar Marker is a lightweight interactive tool for visually marking dates across a five-year span (2026–2030). Pick a color from the palette, then click any date to mark it, or click a week number to highlight the full week — handy for quickly visualizing deadlines, sprints, or personal schedules without setting up a full planning app. Marks are temporary and session-based (they reset on reload), making this ideal for quick visual planning rather than long-term storage. Switch between years instantly using the year tabs, and clear everything in one click with the "Clear all" button. No signup, no backend — just open and start marking.