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Pi-hole
Blocks ads and trackers for every device on the network, no per-device app needed.
Pi-hole works as the network's DNS server. Every device that asks "what's the address for this domain?" asks Pi-hole first. If that domain is a known ad or tracker network, Pi-hole just refuses to answer. No ad ever loads, because the device never even gets its address.
The nice part is it's invisible: no per-device app, no browser extension to install on a TV or game console. Set it once at the router level and every device on the network is covered automatically.