A Boolean string is a logical combination of keywords and Boolean operators (AND, OR & NOT). For additional info and sample Boolean strings, visit the Boolean String Bank
The BOOL chrome extension has a similar interface and is available on the Chrome store.
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This feature was removed in the current version
The autocomplete feature provides keyword suggestions that allow for faster and newer Boolean strings. Currently, a user may choose either text from a web page or saved results as the keyword source.
Extract Keywords From Web Page
Extract Keywords From Saved Results: If you have one or more search results, you may select "Saved Results" from the Keyword Extractor dropdown. This will resturn search keywords according to the following categories – All, People, Places, Emails
Keywords may be used to drive external sourcing decisions or offer suggestions while building Boolean strings once the autocomplete checkbox is selected
This feature was replaced by an email finder in the current version
Boolio's Email Validator is simple, robust and works across multiple domains, including gmail.com and hotmail.com.
By using a multi-step process the Email Validator informs you if your email address invalid (incorrect format), valid but does not exist(valid format but does not exist) or exists.
Compare to other prominent email testers like MailTester.com