Qustodio can detect and block almost any apps that are popular with kids and teens — in my tests, it was able to block apps like YouTube, Discord, Netflix, Twitter, Instagram, TikTok, Facebook, WhatsApp, and more. A support rep told me that Qustodio can block all apps on Android, Windows, and macOS, and that it can block 9,000+ apps on iOS (some parental controls, like Webwatcher, can’t restrict iOS apps at all).