Christoph Trappe
Last reviewed 29 July 2026
Christoph Trappe is a content strategist, author and speaker who has built and run content and digital marketing programs across healthcare, SaaS and publishing. He writes about content performance and how it gets measured. On this site he maintains the comparison of popunder ad networks.
What he covers here
The brief is narrow on purpose. Entry costs and payout terms across eleven networks, what popunder inventory actually pays per thousand visits, how much of the cheap traffic is invalid, and the policy and browser constraints that decide whether the format is available to a given publisher at all. That last part is where most guides stop short — a site earning through Google's ad products cannot add popunder scripts, and the section on the AdSense policy documents it from Google's own pages rather than from hearsay.
How he works
Three rules govern what appears under this byline on popunder-ads.io.
Primary sources outrank everything. A network's own pricing page beats a review site quoting it, and a policy document beats a summary of that policy. Where the two disagree, the disagreement itself gets printed — the comparison currently carries an unresolved conflict on one network's deposit minimum rather than picking a number and hoping.
No invented measurements. There is no first-person campaign data on this site because no campaigns have been run yet, and dressing published benchmarks up as personal results would be the easiest way to make the whole thing worthless. When live testing happens, it will be labelled as such and dated.
Marketing claims get separated from contractual ones. Deposit floors are verifiable; impression counts are not. Both appear, labelled differently. The methodology page explains the check applied to volume claims that do not add up.
What he has published on this site
One piece, kept current rather than replaced: the comparison of eleven popunder ad networks. It carries the sections most often cited elsewhere — the table of entry costs and payout terms, what popunder CPM actually pays per thousand visits, invalid-traffic rates by country, and the browser and consent constraints that decide whether the format works at all.
What he does not cover
Creative production, tracker configuration and campaign management for hire are outside the brief. Neither is this a place to get an account unbanned or a balance released — the contact page explains why writing here about a dispute with a network only adds a step. Requests for help placing pop scripts in ways that breach a publisher network's policies get no answer.
Elsewhere
He publishes on Instagram and Facebook. Corrections and questions about anything on this site go through the contact page, and the terms under which the content is published are on the terms page.