Surprise your users with fully featured spell check; as you type, dialog, user options, autocorrect and custom dictionaries. RapidSpell WPF is built upon 12+ years of experience, it is pure .NET with a WPF front end that can be easily styled to fit in perfectly with your XAML UI. We have millions of end users all over the globe, using our 21 dictionaries (including medical, legal and four English language variations).