What retargeting actually looks like.
The hardest thing about blocking trackers is that when it works, nothing happens. No alert, no blocked-page notice — just an advert you never saw, about a thing you never told anyone. It is difficult to be grateful for an absence.
So here is the absence, photographed. One of our owners sent us these two screenshots the other night. Same phone, same page, the same minute — the clock reads 11:10 in both.
The same page, on two networks.
Bilal had recently ordered a CO2 cylinder for his aquarium. Then he opened a gaming wiki — nothing to do with fish, aquariums or shopping.
On home Wi-Fi, behind the Shield
The article, and no advert block. Look at the status bar: Wi-Fi.
On mobile data, without it
Six adverts for aquarium CO2 gear, in the middle of a gaming article. Status bar: 4G LTE.
“The difference between using shield vs not using shield. I recently ordered a CO2 cylinder for my aquarium and on a gaming website, the ads for CO2 cylinder and related items can be seen when not on shield.”
Bilal, Shield Vault owner — his full review. He is a keystone founding member, a friend of the founder who took an early unit on founding-member terms.
What that actually tells you.
His aquarium shopping and that gaming wiki have no connection to each other. The link between them is a profile — one that follows a person between unrelated sites and is detailed enough to know he was mid-purchase. Nobody told him it existed, and the only reason he can see it here is that he happened to look at the same page twice on two different networks.
That is the ordinary state of the web, not a malfunction. The adverts are the visible part; the profile underneath is the part that keeps working whether or not anyone is buying a fish tank. It is also, incidentally, the same machinery that follows children between a game and a homework site.
Being straight about what this does and does not prove.
It is one owner, one page, one night. It is not a benchmark, and we did not stage it — he sent it to us unprompted. Ad networks vary what they show, so a second attempt would not look identical.
What it does show is a network-level filter doing the thing that is otherwise impossible to notice. You can run the same test in two minutes: open any page on your phone on mobile data, then on a network with filtering, and compare. That is also the honest limit — a filter stops the request, so what you get is the absence. There is never a notification, which is exactly why the second screenshot is worth more than any sentence we could write.
And one thing we will not claim: filtering does not make you invisible. Your internet provider still sees which sites you connect to. What it stops is everyone else building the picture.
Try it on your own network.
A Shield sits behind your modem and does this for every device in the house — with a 30-day home trial for AU & NZ households, so you can run the comparison yourself.