Both Dynamic Web TWAIN and Dynamic TWAIN can acquire images from any TWAIN compatible devices, edit and save images to your local machine. Dynamic Web TWAIN has all features that Dynamic TWAIN has.

Besides the features that Dynamic TWAIN has, Dynamic Web TWAIN is a true web scanning solution specifically designed for your web applications. It is compatible with Internet Explorer, Firefox and can be used to upload and download images through HTTP and FTP.

Reference:

For mor information about Dynamic Web TWAIN, please refer to:
Dynamic Web TWAIN

For more information about Dynamic TWAIN, please refer to:
Dynamic TWAIN

For more information about the differences between Dynamic Web TWAIN and Dynamic TWAIN, please refer to:
Edition Comparison