Display your landing page in a second browser window that opens behind the active tab when a user clicks the page. They see your full landing page when they close their current tab. ~95% view rate. Among the highest-CPM formats for volume verticals.
Popunder ads — sometimes called pop-under, popunder traffic, or below-page ads — open a new browser window or tab behind the user's current window when they click anywhere on a publisher page. Unlike pop-ups (which appear over the current page and are widely blocked), popunders appear below the active window and are only revealed when the user closes or minimizes their current tab. The format is decades old and remains one of the most cost-efficient volume formats in display advertising — high view rate, low CPC equivalent, and direct response to a fully rendered landing page rather than a constrained creative.
The reason popunder still works in 2026 is the math. View rate sits around 95% because the user sees the landing page eventually (when they close their tab or shut down), which is dramatically higher than the 30-50% viewability of standard banner. CPMs are low ($0.50-$2.50 average) because the format doesn't require creative — your landing page is the creative. And conversion economics favor popunder for any vertical where attention is valuable but cheap clicks need to be converted via a full-page experience: streaming, downloads, gaming, sweepstakes, sometimes dating. The format isn't appropriate for premium brand campaigns or content sites where intrusion matters more than impressions.
Visitor clicks anywhere on a publisher site in Mondiad's popunder network.
A new browser window opens behind the active window, navigating to your landing URL.
Default 1 popunder per 24h per user — protects against spam, configurable up to 6/24h.
When the user closes their current tab, your fully rendered landing page is revealed.
The verticals and campaign types where this format consistently outperforms alternatives.
Best-fit vertical for popunder. Users on streaming sites often have multiple tabs; popunder reveal is contextually appropriate.
Sweepstakes converts well on popunder — full-page reveal gives space for the prize hook + signup form.
Adult dating in particular — full-page landing avoids creative restrictions that other formats apply.
iGaming popunder works for casino lobbies and sportsbook offers; full-page lets you show real product.
If you want to test a landing page at scale without paying for creative refinement, popunder gives you cheap, viewable traffic.
Many verticals that don't qualify for native or push are accepted on popunder — full disclosure on the landing page satisfies most ad-network policies.
Every campaign supports our full targeting stack: GEO, device, OS, browser, language, ISP, custom audiences, and behavioral segments.
Launch a campaign →Real performance averages across our 10B+ daily impressions in the past 90 days.
The honest take on when this format wins — and when another format wins.
Popunder appears behind the active window — less intrusive, not blocked by browser pop-up blockers. Pop-up is essentially obsolete; popunder remains effective.
Popunder shows a full landing page; banner shows constrained creative. CPMs are higher for popunder but viewability is dramatically higher too.
Both are full-attention formats. Interstitial blocks current content; popunder reveals after current content. Different user-experience contracts.
Native blends with content for engagement quality. Popunder is pure volume + view rate. Pick by vertical: nutra → native; streaming → popunder.
"Popunder is still our best-performing format for sweepstakes in Tier 2 and Tier 3. Scaled a single MX sweepstakes campaign from $50/day to $1,800/day in five weeks. Other formats couldn't keep up on volume."
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