The features of each pack vary from one another:

Realtime Screener - BasicRealtime Screener - PremiumRealtime Screener - Premium Plus
Real time stock alertsReal time stock alertsReal time stock alerts
Technical ScreenersTechnical ScreenersTechnical Screeners
Fundamental ScreenersFundamental ScreenersFundamental Screeners
Patterns Screeners Patterns Screeners 
Divergences ScreenerDivergences Screener
Options Module Options Module 
Advance ToolsAdvance Tools
Advance IndicatorsAdvance Indicators
Strategy LabsStrategy Labs
Options Portfolio Tracker
Custom coding
Proprietary Indicators
Multiframe time screeners