When you install Qustodio, you must close all your browsers to enable the program's security features and toolbar icon. And even Little Einstein will have a hard time cracking Qustodio's shell.
You can configure separate accounts with different settings for each child, so the 13-year-old doesn't have to share the 8-year-old's security levels, even if you think they should. It covers social media sites, e-mail, and the sites kids visit, not to mention the ones they shouldn't Qustodio blocks access to those sites, and you know which ones we mean, plus any you deem inappropriate for the progeny. Even the cleverest little minds will find it all but impossible to bypass Qustodio's constant monitoring of their online activity: What sites they visit, who they visit with, and what they say and do. Qustodio helps parents keep their kids safe online by leveling the playing field against the biggest threat: your tech-savvy kids, themselves.