BlockAllow is a straightforward program designed to control access to specific websites or content while using Internet Explorer. The interface displays two columns, one for allowed sites and the other for blocked sites. By adding URLs or keywords to the block list, users can prevent access to those sites effectively across search engines like Google, Bing, and Yahoo. Additionally, the program offers password protection for both accessing the tool and uninstalling it, enhancing security measures against unauthorized changes.

However, BlockAllow's efficacy is limited by its sole compatibility with Internet Explorer. While it successfully blocks designated pages, its security can be circumvented by utilizing alternative browsers such as Mozilla Firefox. Despite its effectiveness within its designated scope, users should be aware of its limitations when considering comprehensive website restriction solutions.