How publishers maximise popunder CPM

Popunder is the highest-earning format for most publishers, but two sites with the same traffic can earn very different amounts. The difference is in how you tune frequency, fill and format mix. Here is how to get the most from every visit.

Frequency is a revenue dial, not a switch

Show a user too many popunders and the later ones earn almost nothing while annoying your audience. Too few and you leave money on the table. Start with one or two per user per day, then watch how revenue per visit changes as you adjust - there is usually a clear sweet spot.

Let the auction work

• Run popunder alongside push and in-page push so more advertisers compete for your traffic.
• Keep your tag up to date so you are always in the live auction, not an old static fill.
• Do not hard-block whole verticals unless you must - more demand means higher CPMs.

Mind the user experience

Revenue and retention are not opposites. A sensible frequency cap and clean, malware-free ads keep users coming back, which is what actually compounds your earnings over months. Voltraff screens every advertiser so the ads on your site stay safe.

The takeaway

Treat CPM as something you tune, not something you are handed. Small changes to frequency and format mix, watched over a week, routinely lift revenue per visit without costing you a single user.