Omnichannel Advertising Platforms

The category Forrester scores in this Wave used to be called a DSP, until the label went shopworn. The newest edition, The Forrester Wave: Omnichannel Advertising Platforms, Q1 2026, is the first under the new name, and it scores seven platforms in a market where the top three hold roughly ninety percent of the share.

The label that died before the scorecard

Principal analyst Nikhil Lai announced the renaming on October 16, 2025, with a diagnosis worth quoting in full. "Real-time bidding is broken," trust eroded by allegations of fraud and privacy violations. "AI agents obviate DSPs," because agents can interact with and recognize patterns across publishers simultaneously, removing the need for a centralized interface.

The conditions that sustained the classic demand-side platform are gone: standalone ad exchanges absorbed, fraud-plagued ad networks obsolete, and the buyer's workflow now spans planning, buying, measurement, and optimization across online and offline channels, with AI agents, audience creation, automated creative production, and cross-device identity resolution inside the platform.

The Landscape that preceded the Wave, Q4 2025, profiled twenty seven vendors. The Wave scored seven. The category consolidated as it renamed.

The report under the new name: The Forrester Wave: Omnichannel Advertising Platforms, Q1 2026

The Q1 2026 Wave scores seven providers on current offering, strategy, market presence, and customer feedback, with criteria running through onboarding, training, ongoing support, pricing flexibility and transparency, and self-serve capabilities.

The market context Lai supplies is the real preamble. Advertisers typically use three to five platforms to reach closed and open ecosystems, and they "don't want to be systems integrators." The platforms that win are the ones that unify the most of the buyer's workflow, because every seam left open is another tool the advertiser must staff.

The concentration is structural: Amazon, Google, and The Trade Desk command nearly ninety percent of market share, and the tailwinds, connected TV, commerce media, out-of-home, audio, are growing fastest inside the closed ecosystems the giants own.

The portfolio reality cuts against the consolidation. Lai's market context says advertisers typically use three to five platforms to access closed and open ecosystems, which means the scorecard's job is not to crown a single winner but to tell the buyer which platforms earn a seat in the portfolio. The seven scored vendors are competing for portfolio slots, not for the whole budget, and the tier table should be read that way.

The Leader and its authenticated graph

Amazon Ads announced the Leader placement on March 27, 2026, and the citation's strongest claim is a data asset no other platform can copy: its authenticated graph lets advertisers deterministically reach approximately ninety percent of United States households.

The rest of the citation describes the convergence the category name promises. Amazon unified its demand-side and commerce media platforms behind a "full-funnel advertising at scale for everyone" vision, and its AI capabilities, the Ads Agent for audience creation and targeting and the Creative Agent for production workflows, are the agentic layer Lai's blog said would obviate the old DSP.

The commerce-media detail is the market's future in miniature. An advertising platform that can see the purchase, not just the impression, is the only kind of platform that can close the loop the broken real-time bidding market could not, and the scorecard's Leader is the platform that owns the loop.

The strong performer with the low-TCO scores

StackAdapt announced a Strong Performer placement on March 30, 2026, with above-average customer feedback and the highest possible scores in three criteria: self-serve capabilities, onboarding, training, and ongoing support, and pricing flexibility and transparency.

Forrester's verdict: "favored for its low total cost of ownership and transparent pricing," with a channel span running through connected TV, native, display, video, audio, in-game, and digital out-of-home.

The contrast is the edition's lesson. The Leader wins on closed data and commerce scale. The Strong Performer wins on openness, self-service, and cost. In a market where the top three hold ninety percent, the independent's entire position is the remaining ten percent plus the buyers who refuse the giants' terms, and the scorecard records both positions honestly.

The honest limits of a seven-vendor field

Seven vendors is a small scorecard for a market whose landscape lists twenty seven, and the gap between the two numbers is the category's tension. The Wave scores the platforms with the scale and data to be scored; the long tail of channel-specific and region-specific platforms lives in the Landscape, unscored.

The seven-versus-twenty-seven gap is also a warning about the category's trajectory. The renaming from DSP to omnichannel advertising platforms was, in Lai's framing, the market admitting the old label described a dying product, but the new label describes a product class that may consolidate further before it stabilizes. A scorecard taken at the start of that consolidation is a map of the current leaders, not a prediction of the final field.

There is also the closed-ecosystem paradox. The report's own market context says advertisers need three to five platforms because no single platform reaches everything, yet the scoring rewards the platforms that unify the most. The buyer's actual answer is a portfolio, and the tier table can only grade its components, not the portfolio itself.

Three questions for the post-DSP buyer

Which loop are you actually buying: the impression or the purchase? The Leader's commerce data is the differentiator, but it only closes the loop for commerce-adjacent budgets. For brand advertising, the graph matters less, and the tier column will not tell you that.

What does your platform portfolio look like after this purchase? The report says advertisers run three to five platforms. Score the candidate against the portfolio it joins, not against the tier table alone, because no single row covers your full mix.

What does the agent actually do, and can you see its decisions? The report's own diagnosis is that agents obviate the old interface. Ask for the agent's decision logs on your campaigns, and treat a platform that will not show its agent's reasoning as one that has not finished building it.

Forrester does not endorse any vendor named here, and tier placement should not be read as a recommendation to buy.

The natural next comparison is Commerce Solutions: forrester merged its separate B2B and B2C commerce evaluations into one Wave for the first time, because most buyers now say they are not planning to replatform at all.

Buyers evaluating this should also weigh Creative Advertising Technologies, the closest coverage already published on this site: digital advertising spent twenty years optimizing everything except the advertisement itself. Three Forrester evaluations across six years read like a graveyard of independent vendors absorbed by bigger neighbors.

The neighboring coverage here is Advertising Platforms. Gartner skipped the quadrant for this category entirely and published a warning instead: by 2028, over 70 percent of ad spend will run through AI-priced self-serve platforms nobody independently audits.