Many people claim to dislike pop ads, yet they engage with them. This paradox pretty much sums up aggressive advertising as a whole: people spurn anything that seems forced down their throats, yet they pay attention to ads that come at the right place and time. Pop ads are all tarred with the ‘annoying’ brush, when in fact the ad that stealthily reveals itself beneath your browser window is not the same as the one that slams the brakes on your scrolling and blocks your screen.
Table of Contents
Why “pop ads” is too broad a term
Pop ads generally refer to pop-ups, pop-unders, and interstitials. But many campaigns fail because they are not designed based on the unique user behavior of each ad type. For example, a pop-up literally pops up in a user’s face and must be closed before the user can view the page they were trying to view. An interstitial ad is a full-page ad that appears before the page the user wants to visit is displayed. A pop-under ad opens a new browser window under the active window a user is currently browsing and displays an ad. This type of ad is less obtrusive than a pop-up ad, which appears over the active window, but can still be quite annoying.
The attention paradox behind high-volume campaigns
Users have become accustomed to ignoring elements that look like advertisements which in turn makes them less effective. The more an ad format tries to grab the user’s attention, the more likely it is that they will learn to ignore it. This poses a problem for advertisers: the more prominently an ad is displayed, the more it risks being overlooked.
However, it’s not that users are paying less attention overall, they’re just being more selective about what they pay attention to. Users are more likely to notice ads during natural breaks, such as when they’ve just finished a task, closed a window, or when a page is loading. Popunder ads take advantage of these natural breaks, as they do not interrupt users while they are consuming content. Instead, they create ads that appear once the user has completed the task, so the user’s focus is already available.
The underlying principle of the attention economy in relation to pop-ads is that advertising space is limited, but there are certain times during the browsing experience when users are more likely to notice the ads. Most users will have some free “cognitive cycles” while browsing – times when they are not already focused on consuming content. The key to effective advertising is to make use of these free cognitive cycles rather than overloading users with more visual and textual information.
Timing and triggers matter more than volume
It’s not just about volume either – a pop strategy needs to take the most invasive and misused ad format and make it as unobtrusive as possible. Popads, especially popunders that open behind the active browser window, are potentially the most hated form of ad out there. Beyond just being another interruption, they feel like you’re being forced to interact because leaving them open would be just as irritating. It’s essential to change as many variables as possible in order to avoid that.
The single most important element of any pop ad plan should be not when the ad appears, but the circumstances under which it does. People who see pop ads but don’t immediately close them still often have a short negative reaction to the site they were on when the ad fired. It’s hard to build a positive brand from that negative base. Ads rarely get seen in a vacuum, so good pop ad plans make the ad itself the only constantly annoying part of the experience.
How pop ads and popunders differ in practice
Media buyers often overlook this detail: they consider all pop traffic the same, and then they are surprised when some campaigns perform really well while others have high complaint rates. Remember that pop-ups and interstitial ads are designed to appear in front of the content and force the user to interact with them or close the window before they can view the content. This is not the case with popunder ads. The user sees the ad after browsing the content they requested.
This difference may seem small, but in terms of building a relationship with the potential customer, it’s huge. In-your-face advertising is easy to ignore or forget. Subtle brand exposure while surfing or shopping around can have a big impact that builds over time. For performance advertisers, popunders remain the most reliable option, able to deliver the most conversions for every impression shown because the brand message doesn’t have to battle the user’s immediate annoyance at being affected.
Frequency capping is what keeps the format usable
Ad exhaustion is a concept that is not easy to define. It shows a decrease in response rates and an increase in annoyance which occur when an audience is excessively over-exposed to a particular ad format. For pop ads, in particular, uncontrolled high volume delivery is what leads to ad fatigue and eventually, a bad reputation for the ad format. If you show the same pop-under ad to a user five times during a single session, you are probably turning a tolerated ad format into a reason for this user to use an ad blocker.
Frequency capping is designed to prevent this from happening. You can limit the exposure for a user during a single session or across days. You can rotate creative so that users are shown different ads. And you can hide the ad completely after it has converted, as there is no need to keep showing an ad to someone who has already engaged with the product. The GlobalWebIndex figure on ad blocker adoption is quite revealing in this respect: 42.7% of internet users were blocking ads in 2021. This cumulative exhaustion is how large sections of the web decide to unofficially exit your market. So, besides saving a bunch of money on wasted impressions, frequency capping helps keep you in the game.
Designing creative for low cognitive load
Cognitive load refers to the mental energy used in the processing of information. A popunder ad that immediately makes sense requires less cognitive load than one where the user has to spend extra mental energy trying to understand it before being able to close it.
With creative of this type, less really is more, and the simpler the design, the better for everyone. But the siren song of the dark pattern promises easy clicks at ever-increasing cost. Temptation to trick users is high. A countdown timer that appears pro forma increasing urgency and pressure for a click, an alert creative you know isn’t real but stands out well, a fake close button opt-out. They’re just an extra two or three lines of Javascript on the serving page away.
Honest, low-effort creative isn’t just an ethics position, it’s a performance one. Users who feel tricked don’t convert, they bounce and remember the brand negatively. Users who understand the offer in two seconds and choose to engage are the ones who actually move down the funnel.
Contextual relevance beats broad targeting
Behavioral targeting is when an ad is chosen for you based on what websites you’ve visited in the past. Like all ads, it can be done well, but it’s not hard to overdo it, especially when every new website you visit immediately tries to show you a popunder ad for the last website you looked at. Now it feels like you’re being followed, and the ad you’re about to be shown wasn’t something you requested on the spot; both of those put people on edge.
Contextual targeting solves two of those problems in one go. If the algorithm guessed at the ad you’d be most interested in by looking at the site you’re on right now, or by guessing what you’re interested in right around the moment the ad appeared, there’s none of this retargeting goop to sense directly or get creeped out over.
The more relevant you feel an ad is to the site you’re using, or to the thing you’re trying to do this very minute, the more those interruptions find ways to justify themselves. Someone reading a product comparison article is a reasonable audience for a related offer. They don’t have to guess your favorite product category because you’re reading a review of it. That bridge often won’t be far from your behavior and yet still offers a clear, rational reason for the ad to appear.
This also matters for compliance. Consent fatigue is real, and regulations like GDPR and CCPA have made users more aware of how their data gets used. A pop ad strategy leaning on contextual signals rather than deep behavioral profiles is easier to run inside those consent frameworks and less likely to trigger the kind of backlash that gets a domain blocklisted.
Measuring quality, not just clicks
The most straightforward measure to use while evaluating a popunder seems to be the click-through rate. In a digital marketing world that is obsessed with statistics and quantifiable information this makes sense. However, these are also some of the least valuable numbers you can look at.
Click-through rate is the easiest metric to report. It’s also the worst to judge a popunder by. High CTR from accidental or confused clicks is a vanity number, it looks good in a deck and tells you almost nothing about whether the user got value from what they saw.
Better metrics tend to be viewability, since a popunder that never gets brought to the foreground never really reached anyone. Dwell time on the landing page shows whether people who did click stayed and engaged, or bounced within a second. Bounce rate and conversion rate together tell you whether the traffic quality matches the volume. Assisted conversions matter too, since a popunder that doesn’t convert directly but shows up earlier in a user’s path can still be doing real work.
Balancing publisher revenue with audience trust
Publishers with a large amount of popunder inventory have to make a difficult decision. Popunders can generate revenue from low-intent traffic that is virtually unreachable by display ads. For quite a lot of sites, pop advertising is a potentially lucrative revenue stream. However, the choice to generate that revenue comes with responsibilities. Advertiser quality floors matter. So does investing significant resources to actively block malware-laced creative (which will always seem to find a home in pop inventory if you leave the door open).
Complaint monitoring needs to be a regular part of your week, not something you do after the fires have started. A sudden increase in paid search costs due to a massive wave of negativity around an unmonitored ad over the past few weeks or months continues to hurt long after the campaign’s over.
The publishers who do well with this format treat it as inventory to be carefully managed, not inventory to be blindly maximized. The ones who get burned are usually the ones who sold every available impression without checking what was actually running.
A simple framework: relevance, timing, control, cap
Responsibly running pop ads requires that you consistently apply four checks. Relevance – the offer is a good fit for that specific visitor, and the ad only appears on relevant pages. Timing – the ad only appears after the visitor has arrived and become engaged. Control – the ad should be easy to read and easy to close. Cap – the ad should not be shown to the same visitor more than a set number of times.
Before launching your popup test, be sure to: Check that your campaign logic and triggers are well-matched. Create well-designed pop advertisement images that feature one clear message. Make sure your new close buttons are included. Set your caps before these prove necessary. Create a new report that shows the success measure (the time spent on an ad and whether it was visible) and compare the results directly.
The bottom line on high-volume, low-intrusion advertising
Pop ads do not necessarily lead to pop-up ambushes. Popunders are somewhat in-between the formats that users easily ignore and the formats that users strongly dislike. This middle ground offers a real opportunity. If the timing is correct, if the creative is clean, if the frequency is capped, and if the targeting is based on context rather than generalized behavioral profiling, the format can perform its function.
