VIP has these extras stuff:
Fully Featured Calendar (Best conception chances, ovulation, appointments, forecasted periods, ovulation and fertile days, events, weight data...)
Chart Overlay (multiple charts on the same graph)
CM Pattern Analyzer (Find out your cervical fluid patterns)
Intercourse Timing Analyzer
Advanced Home Page Features
(URL Customization, Password Protection, unlimited number of charts, personalized message on the ticker, display of custom and special data)
Advanced Search Criteria on the Chart Gallery
(Search by coverline, average temperature...)
DPO Count on the chart
(The chart displays the number of days past ovulation right on the graph).
Stats Line On the Chart
(Display your expected days of ovulation and your expected period dates directly on the chart graph. The calculations are derived from your cycle history. The recommended test date is also displayed on this line).
Pregnancy Monitor
(proposes a reasonable test date, searches for early pregnancy signs, display possible due dates...)
Cycle Planner
(Predict your fertile phases and ovulation in a convenient calendar format)
and many others..