When Wine Tastes Best is a free Android application that reveals the best days to open your bottle of wine. The app is based on 50 years of research by biodynamic expert Maria Thun and provides information about good fruit and flower days, less good root and leaf days, and Maria Thun’s unique ‘generally unfavourable’ days (not included in other lunar calendars).

The app is highly customizable, allowing you to choose your preferred global time zone and 12-hour or 24-hour time format. Top UK grocery chains use this calendar to choose their critics' wine tasting days, making it a reliable source of information for wine enthusiasts. While the free version only provides information for the current day and past days, you can purchase the annual data for future days as an in-app purchase.