the author of this app says:
QuickCheck is a spell checking tool for editing text quickly. It is a HackMaster extension that checks the spelling of words and word forms in all applications. This automatically detects errors and underlines them to notify users of possible spelling mistakes.
The distribution pack includes four default vocabulary databases in four languages. For other languages -- specialized and extended vocabulary databases -- please visit the author's home site.
Vocabulary databases for QuickCheck are in sync with QuickWrite and QuickSpell.
- HackMaster or X-Master