Main features
Product option templates to group Magento custom option
Color/image/text swatches for better product visualization
Custom option pricing to assign ANY possible price type
OR/AND dependencies to regulate custom options display
Inventory management to track and display options stock...
Option templates
Use smart templates to add custom options for an unlimited number of products.
Custom option pricing
Set one-time, absolute, special, customer group / tier, negative prices of an option, price per character.
Color / Image / Text swatches
Let the customers see the final version...