That's the short version of what happened when we ran WPS Office on popunder traffic through Adsterra in Vietnam during March 2026. We went in planning to test our way to a winning combo - GEOs, zones, prelanders, funnel variations. We came out with a working bundle, and the main insight had nothing to do with what we added.
It had to do with what we removed.
The Setup
Offer: WPS Office
Traffic source: Popunder - Adsterra
GEO: VN (Vietnam)
Period: March 1–31, 2026
WPS Office is a solid worldwide offer with consistent conversion rates across a wide range of GEOs. We'd worked it before - back in September 2025, Colombia was the standout. It was good enough that we kept it in rotation and kept looking for the next geo to own. Vietnam turned out to be worth the test.
What We Tested
We ran through the usual suspects: different GEOs, traffic zones, and a set of custom prelanders designed to warm up the user before hitting the main page. The prelanders were built carefully. They were supposed to add context, build intent, and smooth the path to conversion. Standard playbook. They didn't help.
The direct advertiser landing - no prelander, no intermediate step - outperformed everything else we tested. CR stabilized at 0.4% and ROI landed at 30%. The funnel that performed best was the simplest one.
The Numbers
Metric
Result
CR
0.4%
ROI
30%
EPC
$0.001
Why This Happens
Popunder traffic has a specific character. The user didn't click an ad - a new window appeared. Their intent is low, their patience is short, and any additional step between the initial impression and the offer is another place where they can leave.
When you add a prelander, you're betting that the extra friction is worth the added context. With cold traffic on a WW software offer, that bet often doesn't pay. The advertiser's landing is already optimized for conversion - it's been tested against more traffic than we'll ever send it.
The lesson isn't that prelanders never work. It's that testing them is the only way to know, and sometimes the answer is: don't bother.
The Risk to Know About
WPS Office is a WW offer, which is both the opportunity and the constraint. GEOs burn. Vietnam is working now - Colombia was working in September 2025 and the numbers have dropped significantly since then. Running a WW offer without rotating GEOs means betting on a single market staying stable. That's not a strategy, it's a countdown.
The same applies to traffic sources. Every network has volume limits on specific zones. A bundle that's working on Adsterra will hit a ceiling. Testing the same setup on a second source before you need to is how you scale without starting over.
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What to Do With This
If you're looking for a stable software offer to test on popunder traffic, WPS Office is worth your time. The conversion logic is clean, the advertiser's landing does the work, and the GEO flexibility gives you room to move when one market softens.
Our approach:
Start with the direct advertiser landing before building prelanders
Rotate GEOs actively - don't wait for a working one to die
Run at least two traffic sources in parallel once you find a converting zone
This case study is based on CIPIAI team traffic data for March 2026. Results are specific to this period, GEO, and traffic source. Your numbers will vary - that's what testing is for.
