AdGuard Pro can do DNS blocking on iOS. The default AdGuard server selection will block tracking requests. If you only want to block malware, or other more ser

AdGuard Pro can do DNS blocking on iOS. The default AdGuard server selection will block tracking requests. If you only want to block malware, or other more serious badness, you can opt for others servers such as Quad9 or OpenDNS . Edit: AdGuard is also (partially?) opensource - https://github.com/AdguardTeam https://github.com/AdguardTeam