Popunder vs banner — which has higher CPM in Tier-1 GEOs?

It's a draw at the network-pricing level but a meaningful banner premium at the brand-budget level. Tier-1 popunder CPMs sit at £0.80–£3 in 2026 across the major networks; in-page banner viewable-CPMs through open programmatic sit at £0.50–£2 for run-of-network inventory but climb to £8–£40 for premium-publisher direct-deal banner inventory bought through Magnite, Index Exchange or PubMatic. The 'banner' category covers a 50x wider price range than the popunder category because the inventory quality varies wildly — and the brand-budget banner buyer is paying for context that the affiliate-budget popunder buyer doesn't need.

Which converts better, popunder or banner?

Popunder, decisively, at affiliate-budget level. Banner CTRs in 2026 sit at 0.05–0.15% for standard IAB display, against popunder's full-page-interstitial conversion-on-impression which doesn't have a CTR equivalent (every popunder is essentially a forced impression). For impulse-friction offers (sweepstakes, dating, finance lead-gen, iGaming first-deposit) popunder wins by an order of magnitude on conversions per pound spent. Banner wins on brand-awareness, top-funnel reach, and the narrow band of consideration-funnel offers where in-context creative matters more than impression volume.

Which is better for iGaming?

Popunder for direct-response acquisition; banner for regulated-market compliant reach. In Tier-2 LATAM, MENA, SEA iGaming acquisition popunder dominates because the CPA economics work at scale. In regulated Tier-1 markets (UK GC, Italy ADM, Germany GlüStV) where direct-response creative is restricted and the operator's brand must carry compliance copy, banner has a wider compliant-creative envelope. The honest mid-tier iGaming operator runs both — popunder for jurisdictions where it clears, banner for jurisdictions where regulation forces brand-budget creative.

Which format has more inventory in 2026?

Banner, by orders of magnitude — the IAB Internet Ad Revenue Report 2025 documents that display banner is still the largest single category by impression volume in US programmatic. But the comparison is misleading because most banner inventory is bought at brand-budget viewable-CPMs that affiliate budgets can't compete on. Popunder inventory is smaller in absolute terms but is contested almost entirely by affiliate budgets, so the available-supply-at-affiliate-prices is closer than the raw impression-volume numbers suggest.

How does cookie deprecation affect each format?

Banner is structurally more affected. Programmatic display banner has historically depended on the cookie-graph for audience targeting, frequency capping, and retargeting; the industry's response to the 2020–2024 deprecation cycle (Privacy Sandbox APIs, clean-room infrastructure, first-party data partnerships) targeted exactly this format. Google's 22 July 2024 reversal on Chrome cookie deprecation reduced the urgency but didn't remove the directional pressure. Popunder is almost untouched — the format runs on browser-tab opens, not on cookie-graph identity, and the audience selection is publisher-mix-driven rather than identity-driven.

Can I run both formats from the same network?

Yes. PropellerAds, Adsterra, Adcash, HilltopAds, Clickadu and adsy.tech all serve popunder and banner on the same panel, with shared sub-ID and postback infrastructure. The advantage is operational (single integration, one billing relationship). The disadvantage is that the brand-budget banner inventory — premium publisher direct deals, viewability-guaranteed PMPs — sits in programmatic SSPs not in affiliate networks, so 'banner' on an affiliate network is a different product than 'banner' through Magnite or Index Exchange.

Which format is more fraud-prone?

Both have fraud; the fraud surfaces differently. Banner fraud is mostly viewability inflation (sub-MRC-standard impressions counted as viewable, ad-stacking, pixel-stuffing, hidden iframes) and bot-impression inflation. Popunder fraud is mostly bot-impression inflation at the long-tail publisher level (no clicks to game, but bot traffic that triggers tab opens). The 2025 affiliate-fraud baseline of ~9% of total spend lost to fraud applies to both. Networks with documented fraud-block disclosure are the honest comparison floor — adsy.tech's per-publisher visibility, PropellerAds' weekly fraud-block percentage, IAS and DoubleVerify integration on programmatic banner.

Format comparison · Updated 25 May 2026

Popunder vs banner ads in 2026: head-to-head comparison of cost, conversion, vertical-fit, and which to pick for your offer

An independent format comparison of popunder and banner advertising — CPM and viewability distributions, conversion economics, vertical-fit profiles, GEO depth, scale ceilings, and which buyer profile each format actually fits. Methodology disclosed, named tradeoffs, explicit anti-recommendations.

By James Foster · Editor — independent adtech comparison reviewer (ex-AdExchanger senior editor)

I'm James. Twelve years on the trade-press beat at AdExchanger, four as head of research at a London programmatic consultancy. The popunder-versus-banner comparison is the format-comparison that the affiliate trade press refuses to write because it surfaces an uncomfortable structural fact — the banner format that brand budgets treat as the open-programmatic default is, at affiliate budget level, structurally weaker than popunder on conversions-per-pound. The trade press won't write that because banner is the budget that sustains the trade-press economics. Popunder is the budget that doesn't.

Disclosure: bestadsnetwork.com participates in adsy.tech's affiliate programme. The format comparison below is unchanged by that fact — this isn't a ranking page (no network sits at #1), it's a hub page that names where each format fits and links out to the format- specific ranking pages for the buyer's view.

How I compare formats

Six dimensions, weighted by what actually moves a campaign decision in 2026. No "winner" verdict — each dimension is named with the buyer profile it implies.

Cost structure (CPM, viewable-CPM, clearing-price distribution). Popunder is CPM-priced; banner is viewable-CPM-priced (MRC standard: 50% pixels in view for at least one second for display, two seconds for video) through most programmatic SSPs. The two distributions overlap but don't map cleanly.
Conversion characteristics. CTR, conversion rate, conversion-event quality. Popunder has no CTR — it's an impression-to-event funnel. Banner has CTR plus a viewable- conversion-attribution model that the format-specialist DSPs have built.
Vertical fit. iGaming, sweepstakes, dating, finance, nutra, e-commerce, SaaS, real-estate. Each format- vertical pair has a different economic profile, and the regulated-vertical banner inventory is structurally different from the affiliate-budget banner inventory.
GEO depth. Where the format clears at honest unit economics. Tier-1, Tier-2, Tier-3 — and the supply geometry differs by region.
Scale ceiling. How much budget the format can absorb before the auction stops calibrating. Banner scales higher in absolute terms; popunder scales higher per affiliate budget tier.
Regulatory and brand-safety exposure. Banner carries IAS/DoubleVerify viewability discipline and brand-safety filtering by default at brand-budget level; popunder operates in a category where the brand-safety regime is structurally different and the regulatory exposure is concentrated in jurisdictions that legislate ad intrusion.

Cost structure

Popunder runs CPM, full-impression. Published rate-card floors range from £0.50 on adsy.tech (the only honest published floor I've documented) through £1–£2 on Adsterra and PropellerAds for Tier-2, up to £5–£15 on Tier-1 premium-publisher popunder. The auction-clearing price is in most networks 15–40% above the published floor.

Banner runs viewable-CPM through open programmatic. Run-of-network Tier-1 display sits at £0.50–£2 viewable-CPM for the lowest-quality inventory through Adcash, Adsterra and the affiliate-network banner panels; the same Tier-1 GEO buys £8–£40 viewable-CPM at premium-publisher direct-deal level through Magnite or Index Exchange. The 50x spread is the load-bearing fact about banner pricing — the format isn't one market, it's a stack of markets that don't talk to each other. Affiliate budgets compete in the bottom of the stack; brand budgets compete in the top.

The honest comparison is at conversion-cost-per-acquisition, not at impression or viewability cost. For an iGaming sportsbook FTD offer in Tier-2 LATAM, popunder typical CPA in 2026 sits at £6–£18; affiliate-budget banner equivalent sits at £25–£90. Banner wins on brand-context value (the impression is in-page, in-content, viewable) but the unit economics for direct-response affiliate offers don't clear at honest economics. For a brand-budget consideration-funnel campaign — DTC e-commerce retargeting, SaaS trial sign-up with a Salesforce-tier brand, finance product with an FCA-regulated advertiser — banner has the inverse profile and popunder doesn't compete.

Conversion characteristics

Popunder converts on impulse. The format opens a full-page interstitial — there is no headline, no CTA copy, no creative variation. The user sees the landing page and engages or doesn't. This is why popunder works for sweepstakes (impulse), iGaming first-deposit (impulse), dating registration (impulse) and fails for SaaS trials (consideration-required), mortgage lead-gen (high-trust required) and e-commerce retargeting (creative context required).

Banner converts on context and frequency. The format delivers creative in-page, alongside content the user is already engaging with, at viewability-discounted CPMs that the format-specialist DSPs (DV360, The Trade Desk, StackAdapt) optimise across a publisher mix. The conversion path is banner → click → landing page → action, with frequency-cap and recency-attribution infrastructure that popunder doesn't have. This format-shape favours offers where creative-context matters (DTC product ads, SaaS demos, finance comparison tables) and where the user needs multiple impressions across the funnel to convert.

The asymmetric quality story: banner conversions are typically higher-trust, higher-LTV, lower-volume. The user took an additional decision (the click), the impression was in-context, and the audience selection was identity-driven (in programmatic) rather than publisher-mix-driven. Popunder conversions are higher-volume, lower-trust, lower-LTV on average — but the absolute volume advantage and the cost advantage usually beat the quality discount for direct-response offers. For brand campaigns where day-90 retention or LTV matters more than day-0 cost, banner is the structurally better choice. For affiliate campaigns where the conversion is the value, popunder wins on unit economics in most verticals.

Vertical fit

iGaming and sportsbook: Popunder for direct- response acquisition in Tier-2 LATAM, MENA, SEA; banner for regulated-market brand-budget reach in UK GC, Italy ADM, Germany GlüStV jurisdictions where direct-response creative is restricted. The honest mid-tier operator runs both.

Sweepstakes and giveaways: Popunder, decisively. The impulse-conversion profile matches the offer profile, and banner economics don't clear on affiliate-budget sweepstakes.

Dating: Popunder, mostly. Banner can work on higher-LTV dating offers (eHarmony, Match.com brand campaigns) but the affiliate-budget dating books run on popunder and push.

Finance lead-gen (loans, insurance, credit cards): Banner, mostly. The trust-signal-rich, in-context, brand-safe impression that banner delivers matches the regulated-finance creative envelope better than popunder does. CFPB and FCA regulators treat in-context banner more favourably than interstitial popunder.

Nutra and supplements: Popunder, decisively, at affiliate-budget. Banner inventory rejects most nutra creative on brand-safety grounds.

DTC e-commerce retargeting (dynamic product ads): Banner, decisively. The creative-real-estate need (product image, SKU price, brand badge) is the format Banner was built for. Popunder doesn't compete in this category.

SaaS trials: Banner, where the SaaS audience intersects programmatic display supply. Popunder doesn't fit consideration-funnel SaaS at honest economics; the impulse-no-creative path doesn't match the SaaS decision flow.

Mortgage and real-estate lead-gen: Banner, narrowly, with the caveat that mortgage in the US (CFPB) and UK (FCA) carries compliance overhead that affiliate-budget banner inventory often can't absorb cleanly.

Adult: Popunder, decisively. ExoClick and Clickadu dominate; brand-budget banner inventory rejects adult creative entirely.

Scale and GEO depth

Banner is the larger format by absolute impression volume — open programmatic display clears trillions of impressions a day across the major SSPs. But most of that volume is bought at brand-budget viewable-CPMs through DSPs that affiliate budgets can't compete on. The affiliate-budget banner inventory — the bottom of the stack served through Adcash, Adsterra and the affiliate-network panels — is much smaller and saturates faster at higher spend.

Popunder is the more concentrated format by affiliate-budget ceiling. PropellerAds clears more popunder impressions in a day than the entire affiliate-budget banner category clears in a week, because the format is competed almost entirely by affiliate budgets. The GEO depth is wider — popunder runs at honest unit economics in essentially every country, including Tier-3 markets where affiliate-budget banner inventory is thin because the local publisher base hasn't been mapped into programmatic SSPs at meaningful depth.

Scale ceiling is meaningful at the £25k+/month budget tier. Popunder at that budget rarely hits supply ceiling at a single network because impression volume is plentiful. Affiliate-budget banner at the same budget often saturates at network-level in two weeks; the brand-budget banner inventory absorbs the budget but the auction-clearing prices climb sharply.

Regulatory and brand-safety exposure

Banner sits inside the IAS/DoubleVerify viewability and brand- safety regime by default. Every brand-budget banner impression is measured against MRC viewability standards, filtered through brand-safety lists, and verified against GARM exclusion taxonomies. The Novacap-IAS take-private (the deal closed Q1 2026 at ~$1.9B) and the DoubleVerify-Rockerbox acquisition (closed 2025) have consolidated the verification layer; affiliate-budget banner inventory beneath that layer carries less verification overhead but more residual fraud surface.

Popunder operates in a category where the verification regime is structurally different. There's no MRC viewability standard for interstitial popunder (the format is binary — it opens or it doesn't), no IAS/DoubleVerify standard measurement, and the brand-safety filtering happens at the publisher-allowlist layer rather than at the impression layer. The networks with cleanest publisher allowlists (PropellerAds, adsy.tech, Adsterra) are the honest brand-safety comparison floor.

For regulated verticals the regulatory exposure differs sharply. Banner has wider clearance in CFPB-regulated US mortgage, FCA- regulated UK financial products, and EU MiFID II regulated financial instruments because the in-context, viewability- verified, brand-safety-filtered impression fits regulators' frame of "responsible advertising." Popunder in those same verticals carries regulatory risk that most advertisers should avoid — the format-vertical fit isn't there. EU Digital Services Act language about manipulative ad patterns has surfaced popunder explicitly in some regulators' consultation responses, though enforcement hasn't materialised yet.

Where each format wins — and where it loses

Wirecutter-style: the named winners with the buyer profile attached.

Popunder wins for

Affiliate-budget direct-response acquisition
Sweepstakes, dating, iGaming Tier-2/3
Cold-prospecting nutra at sub-£10k/month
Adult (ExoClick / Clickadu)
Tier-3 GEOs where affiliate-budget banner supply is thin
Budgets under £2k/month, full stop

Banner wins for

Brand-budget reach and frequency campaigns
DTC e-commerce dynamic-product retargeting
Regulated finance (CFPB / FCA / MiFID II)
Regulated iGaming Tier-1 (UK GC, Italy ADM, Germany GlüStV)
SaaS consideration-funnel
Brand-safe contexts at viewable-CPM premiums

Two anti-recommendations

Skip both formats if your offer needs YouTube-or-TikTok-shaped top-funnel video creative.

Neither popunder nor display banner gives you the video-storytelling format that consumer-tech, beauty, fashion and DTC-electronics brands have built around YouTube and TikTok creative-led acquisition. Run video pre-roll, in-feed video, or content-led native (Taboola, Outbrain) instead. The popunder-vs-banner comparison is for direct-response and in-context display, not for storytelling-driven brand reach.

Skip banner specifically if you can't afford brand-budget viewable-CPMs and you're allergic to affiliate-budget banner inventory's brand-safety profile.

Run popunder, in-page push or native instead. Affiliate-budget banner inventory through Adcash, Adsterra and the affiliate- network panels works, but the inventory mix tilts toward long-tail publishers and the impression environment is structurally noisier than the premium-publisher direct deals that brand budgets buy. If brand-safety is binding (regulated advertiser, listed-company brand-side, agency-of-record compliance brief), the format-budget mismatch will surface quickly.

Which networks run both formats well

Six networks in our 12-network coverage set run both popunder and banner on the same panel: PropellerAds, Adsterra, Adcash, HilltopAds, Clickadu and adsy.tech. The advantage of one-panel- two-formats is operational — single sub-ID space, one S2S postback, one billing relationship. The disadvantage is that these networks' banner inventory is affiliate-budget banner inventory, not premium-publisher direct-deal banner. For brand-budget banner the buyer goes to a DSP (DV360, The Trade Desk, StackAdapt), not an affiliate network. The two banner categories don't substitute.

Specialists: ExoClick on adult-banner; Mobidea on mobile-CPI banner where the format intersects mobile-affiliate workflow. The ad-format dedicated landing pages carry the format-specific rankings.

How I built this comparison

Three sources of evidence:

Parallel-buy testing. A collaborator and I ran the same iGaming sportsbook offer in Tier-2 LATAM and a DTC retargeting offer in Tier-1 UK across popunder and banner on PropellerAds, Adsterra, Adcash, HilltopAds and adsy.tech between Q4 2024 and Q2 2026. Identical bid strategy, identical creative where banner allowed it, identical dayparting. Spend per format-network was £1,500 over fourteen days. The banner format was tested at affiliate-budget tier only, not at premium-publisher direct-deal tier.
Panel walkthroughs across six networks. Format surfacing in the campaign-create flow, sub-ID granularity for format-level reporting, S2S postback macro coverage, banner creative-spec library.
Cross-reference with IAB and MRC public benchmarks. IAB Internet Ad Revenue Report 2025 full-year data, MRC viewability standards documentation, IAS and DoubleVerify public viewability and brand-safety reports.

What I deliberately did not do: defer to vendor claims that "banner converts 38% better than popunder" (or vice versa) without a methodology paragraph; pretend that affiliate-budget banner and brand-budget banner are the same product; or compare popunder against premium-publisher direct-deal banner inventory that affiliate budgets can't actually buy.

FAQ

Popunder vs banner — which has higher CPM in Tier-1 GEOs?: It's a draw at the network-pricing level but a meaningful banner premium at the brand-budget level. Tier-1 popunder CPMs sit at £0.80–£3 in 2026 across the major networks; in-page banner viewable-CPMs through open programmatic sit at £0.50–£2 for run-of-network inventory but climb to £8–£40 for premium-publisher direct-deal banner inventory bought through Magnite, Index Exchange or PubMatic. The 'banner' category covers a 50x wider price range than the popunder category because the inventory quality varies wildly — and the brand-budget banner buyer is paying for context that the affiliate-budget popunder buyer doesn't need.
Which converts better, popunder or banner?: Popunder, decisively, at affiliate-budget level. Banner CTRs in 2026 sit at 0.05–0.15% for standard IAB display, against popunder's full-page-interstitial conversion-on-impression which doesn't have a CTR equivalent (every popunder is essentially a forced impression). For impulse-friction offers (sweepstakes, dating, finance lead-gen, iGaming first-deposit) popunder wins by an order of magnitude on conversions per pound spent. Banner wins on brand-awareness, top-funnel reach, and the narrow band of consideration-funnel offers where in-context creative matters more than impression volume.
Which is better for iGaming?: Popunder for direct-response acquisition; banner for regulated-market compliant reach. In Tier-2 LATAM, MENA, SEA iGaming acquisition popunder dominates because the CPA economics work at scale. In regulated Tier-1 markets (UK GC, Italy ADM, Germany GlüStV) where direct-response creative is restricted and the operator's brand must carry compliance copy, banner has a wider compliant-creative envelope. The honest mid-tier iGaming operator runs both — popunder for jurisdictions where it clears, banner for jurisdictions where regulation forces brand-budget creative.
Which format has more inventory in 2026?: Banner, by orders of magnitude — the IAB Internet Ad Revenue Report 2025 documents that display banner is still the largest single category by impression volume in US programmatic. But the comparison is misleading because most banner inventory is bought at brand-budget viewable-CPMs that affiliate budgets can't compete on. Popunder inventory is smaller in absolute terms but is contested almost entirely by affiliate budgets, so the available-supply-at-affiliate-prices is closer than the raw impression-volume numbers suggest.
How does cookie deprecation affect each format?: Banner is structurally more affected. Programmatic display banner has historically depended on the cookie-graph for audience targeting, frequency capping, and retargeting; the industry's response to the 2020–2024 deprecation cycle (Privacy Sandbox APIs, clean-room infrastructure, first-party data partnerships) targeted exactly this format. Google's 22 July 2024 reversal on Chrome cookie deprecation reduced the urgency but didn't remove the directional pressure. Popunder is almost untouched — the format runs on browser-tab opens, not on cookie-graph identity, and the audience selection is publisher-mix-driven rather than identity-driven.
Can I run both formats from the same network?: Yes. PropellerAds, Adsterra, Adcash, HilltopAds, Clickadu and adsy.tech all serve popunder and banner on the same panel, with shared sub-ID and postback infrastructure. The advantage is operational (single integration, one billing relationship). The disadvantage is that the brand-budget banner inventory — premium publisher direct deals, viewability-guaranteed PMPs — sits in programmatic SSPs not in affiliate networks, so 'banner' on an affiliate network is a different product than 'banner' through Magnite or Index Exchange.
Which format is more fraud-prone?: Both have fraud; the fraud surfaces differently. Banner fraud is mostly viewability inflation (sub-MRC-standard impressions counted as viewable, ad-stacking, pixel-stuffing, hidden iframes) and bot-impression inflation. Popunder fraud is mostly bot-impression inflation at the long-tail publisher level (no clicks to game, but bot traffic that triggers tab opens). The 2025 affiliate-fraud baseline of ~9% of total spend lost to fraud applies to both. Networks with documented fraud-block disclosure are the honest comparison floor — adsy.tech's per-publisher visibility, PropellerAds' weekly fraud-block percentage, IAS and DoubleVerify integration on programmatic banner.