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Advertisers choosing a demand-side platform (DSP) are deciding more than where ads run: they are allocating budget among platforms with different inventory, data, measurement, fees and operating requirements. Google Display & Video 360 (DV360), Amazon DSP and The Trade Desk are prominent scaled competitors, but none is the universal best choice. The right fit depends on the advertiser’s channels, customer data, measurement standards, budget and ability to manage programmatic buying.
The U.S. advertising market is expanding: IAB forecast 9.5% growth in total U.S. ad spend in 2026 and more than $80 billion in U.S. digital video ad spend that year. Those are forecasts for the advertising market—not DSP revenue or market shares. IAB’s 2026 ad-spend outlook and its digital-video forecast help explain why platforms are competing for budgets in video, connected TV (CTV) and commerce media.
What a DSP does—and what it does not do
A demand-side platform automates the purchase of digital advertising inventory for an advertiser or agency. It can help set up campaigns, select audiences and inventory, manage bids and budgets, control frequency, deliver creatives, negotiate or activate deals, and optimize toward chosen outcomes such as reach, completed views, clicks or conversions.
A DSP is not the same thing as an ad exchange or supply-side platform (SSP), which helps publishers offer inventory; an ad server, which delivers and records ads; a retail media network, which sells a retailer’s advertising inventory and audiences; or a social-media buying interface, which generally buys within that platform’s own environment. An agency or trading desk may operate a DSP for a client, but is not itself the DSP.
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A simplified buying path is: advertiser budget → agency or trading desk, if used → DSP and its fees → exchange, SSP or publisher supply → auction or negotiated deal. The actual path can involve intermediaries and different commercial arrangements, so buyers should ask which parties are paid and for what.
Separate the media from the fee stack
The amount spent on impressions is only one part of the campaign’s cost. Depending on the platform, contract and buying route, the total can include media cost, a DSP platform fee, audience or data charges, verification and measurement, ad serving, marketplace or deal costs, agency or managed-service fees, and applicable taxes or surcharges. DV360 documentation, for example, distinguishes platform fees from third-party fees, add-on fees and other billable costs; its rates are not a universal public price card. See DV360’s billable-cost explanation and its contract-based billing information.
For budgeting, ask for an all-in view: media cost + DSP fee + data + verification + ad serving + deal or marketplace charges + agency or service fee + taxes and surcharges. A low quoted CPM does not necessarily mean a lower total cost or better business result.
How the DSP market is organized
The market is best understood by strategic position, not as a single ranking. Scaled platforms compete across overlapping categories: open-web display and video, CTV and streaming, retail and commerce media, audio, mobile apps, digital out-of-home (DOOH), private marketplaces and programmatic guaranteed deals. Platforms do not offer identical access to every publisher, audience or buying method.
Scaled generalists and vertically integrated platforms
DV360, Amazon DSP and The Trade Desk are among the most visible scaled options, but their strengths differ. Google’s platform benefits from connections to Google Marketing Platform workflows and access to YouTube and other programmatic inventory. Amazon’s proposition centers on shopper and purchase-related signals, Amazon properties and off-Amazon media. The Trade Desk emphasizes independent omnichannel buying and open-internet access.
A 2026 SEC filing includes an estimate attributing roughly 86% of DSP share to DV360, Amazon DSP and The Trade Desk, with approximate shares of 47%, 20% and 19%, respectively. Treat that as an attributed estimate, not settled industry consensus: market share depends on the definition and denominator, and the filing does not establish a universal industry methodology. It may not capture the same market as a measure of gross advertiser spend, platform revenue, impressions, CTV, social media or retail media. The filing should not be used as a definitive ranking without that qualification.
Challengers, specialists and service-led options
Other contenders include StackAdapt, Yahoo DSP, Viant, Basis Technologies, Simpli.fi, Nexxen, Adform, Equativ, Quantcast, Liftoff and regional or vertical specialists. Their relevance varies with geography, channel mix, advertiser size, minimums, service model, industry, data needs and access through an agency or reseller. A smaller or more specialized platform may be a better practical fit for a particular campaign, but a vendor name alone does not establish inventory quality, performance or total cost.
StackAdapt’s 2026 programmatic report draws on research involving 484 senior marketers in North America and the United Kingdom, as well as platform data from more than 6,000 advertisers. It is useful as vendor-sponsored perspective on challenger positioning, not as independent proof that one DSP performs better. The report is available from StackAdapt and as a PDF.
How the major platforms differ
Google Display & Video 360
Core proposition: DV360 combines enterprise programmatic buying with connections to Google Marketing Platform workflows and YouTube. Google documents YouTube and programmatic guaranteed deals as distinct inventory categories, with fee treatment that varies by inventory type. See its documentation on partner fees and inventory rates, DV360 fees, and programmatic guaranteed deals.
Potential fit: Large advertisers and agencies already using Google Marketing Platform, buyers that need YouTube alongside broader programmatic buying, and teams managing complex enterprise campaigns or deal workflows.
Questions and cautions: Contract terms and fees require direct review, and the interface and workflows can be demanding for smaller teams. Some buyers may also weigh ecosystem dependence and questions about platform conflicts or measurement neutrality. Custom bidding has feature-specific limitations: Google says it is unavailable on YouTube, programmatic guaranteed and Demand Gen inventory. Its documentation also specifies model data requirements for certain custom-bidding uses, including at least 10,000 scored impressions and 500 positively scored impressions; assigning an untrained model to a live campaign can stop spending. Check the current feature rules and campaign eligibility in Google’s custom-bidding documentation before relying on it.
Amazon DSP
Core proposition: Amazon positions its DSP around shopper and purchase-related signals, Amazon properties including Prime Video, and third-party inventory. Amazon describes support for audio, display, online video, streaming TV and physical-store advertising, with self-service and managed-service routes. See Amazon DSP’s product page.
Potential fit: Ecommerce, retail and consumer packaged goods advertisers seeking shopper audiences or evaluating sales, repeat purchases and new-customer outcomes. It can also be considered by brands seeking to combine Amazon properties with off-Amazon reach.
Questions and cautions: The value of purchase-related signals may be less compelling for advertisers without a meaningful Amazon commerce relationship. Buyers should compare Amazon-reported conversions with an independent measurement approach and distinguish Amazon DSP from other Amazon Ads campaign products. Amazon announced in June 2025 that it charged 0% for programmatic guaranteed deals on Amazon properties and 1% for publishers across the open internet. Those are specific announced fee policies, not an all-in campaign price: data, verification, service, deal, creative and other costs may still apply, and policies can change. See Amazon’s fee announcement.
The Trade Desk
Core proposition: The Trade Desk presents itself as an independent omnichannel DSP focused on open-internet buying, CTV, identity and supply-path choices. Its Kokai initiative is described by the company as using AI to evaluate individual impression opportunities against advertiser criteria such as audience, geography and inventory. That is vendor positioning, not independent evidence of superior campaign performance. See The Trade Desk’s Kokai materials.
Potential fit: Enterprise brands and agencies buying across multiple channels, especially those seeking an alternative to a vertically integrated media platform or managing substantial CTV activity.
Questions and cautions: Do not assume independence means neutrality, lower fees or better outcomes. Contractual access and managed-service arrangements can be complex, and there is no universal public price card for comparing total costs. CTV inventory access is not the same as deduplicated incremental reach; ask how the platform handles overlap and measurement.
What platforms compete on
Inventory and supply paths
Inventory access can include open auctions, direct publisher relationships, premium CTV, retailer-owned media, YouTube or other platform-specific inventory, programmatic guaranteed deals, private marketplaces, DOOH, audio and mobile apps. A large count of available impressions does not prove unique reach or quality. Ask whether the supply is incremental, available only through that DSP, duplicated through multiple SSPs, transparent at the publisher or app level, and subject to meaningful quality controls.
Buyers should evaluate direct versus reseller paths, ads.txt and app-ads.txt compliance, sellers.json and SupplyChain Object support, invalid traffic, viewability, made-for-advertising exposure, and CTV app and content transparency. Also ask whether publisher-level reporting and deduplicated reach are available. For DV360, Google’s guidance says non-guaranteed fixed deals commonly have CPMs of $4 or more and often require minimum-spend commitments. This is platform guidance, not a universal market benchmark; see Google’s fixed-deal documentation.
Data and identity
Platforms may differentiate through retail purchase data, search or browsing signals, logged-in audiences, advertiser first-party data, commerce audiences, contextual models, identity graphs and conversion or customer-value signals. More data is not automatically better targeting. Test whether a signal is recent, lawfully usable in the relevant geography, large enough to scale, associated with incremental outcomes, and independently auditable. Ask for match-rate information and whether the data fee is inside or on top of the quoted CPM.
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Optimization and AI
Most major DSPs promote machine learning or AI. The meaningful comparison is what the system optimizes—clicks, conversions, revenue, reach, completed views or predicted value—how much data it needs, whether the buyer can inspect or constrain decisions, and whether it can concentrate spending in cheap but low-quality supply. Ask how the platform handles sparse or delayed conversions, proxy metrics and changes during its learning period. Where possible, use holdouts or incrementality tests rather than treating a vendor’s AI claim as proof of business impact.
Measurement and attribution
DSPs compete on reporting as well as buying. Relevant measures may include platform-attributed conversions, view-through and click-through attribution, media-mix modeling, geo experiments, holdouts, reach and frequency, completed-view cost, sales lift, new-customer rate, lifetime value, attention and independent verification.
Platform-reported return on ad spend (ROAS) can be useful within a campaign, but it is not automatically comparable across platforms. Attribution windows, identity coverage, conversion definitions, viewability rules, deduplication, post-view credit and household or cross-device exposure can differ. Any comparison should align these definitions and the campaign period before interpreting a difference as performance.
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Service, transparency and access
Self-service gives a capable team more direct control; managed service can reduce the workload for advertisers without trading expertise. The trade-off is that fees, account ownership, data access and optimization decisions need explicit terms. Confirm whether the account belongs to the advertiser, whether campaign data can be exported, how media is priced, whether the service fee or markup is disclosed, and whether the advertiser can move to self-service. Access may also depend on geography, minimum spend, contracts, agency relationships, verification and technical setup; the largest platform is not necessarily commercially accessible to every buyer.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to compare platforms for your business
Use a weighted scorecard rather than a generic “best DSP” ranking. Set the weights to reflect the campaign’s actual purpose; a CTV reach plan, ecommerce acquisition campaign and regional lead-generation program should not be scored identically.
| Evaluation area | Questions to answer |
|---|---|
| Advertiser objective | Is the priority direct response, brand reach, CTV reach and frequency, ecommerce sales, new-customer acquisition, app installs, B2B leads, regional targeting or brand safety? |
| Channel requirements | Does the plan need display, online video, CTV, audio, mobile apps, DOOH, native, programmatic guaranteed or private-marketplace inventory? |
| Data strategy | Can the platform use advertiser first-party data? What onboarding, clean-room, identity, contextual, consent and audience-licensing options are available? |
| Measurement independence | Can the buyer use independent verification, server-side conversion feeds, media-mix modeling, incrementality testing, clean-room analysis and exportable event-level data where available? |
| Commercial model | Is the route self-service, managed service, agency or reseller access? What are the contract, minimum, fee, support and spending-flexibility terms? |
| Supply quality | Can the buyer inspect sellers and apps, direct versus reseller paths, invalid traffic, viewability, MFA exposure, CTV content and duplicated auctions? |
| Operational burden | How long are onboarding and creative approval? Are reporting, APIs, bulk editing, billing reconciliation, troubleshooting and training adequate? |
Starting points by advertiser situation
| Situation | Starting point to evaluate | Why it may fit | Main caution |
|---|---|---|---|
| Large enterprise already using Google Marketing Platform | DV360 | Integrated workflow, measurement connections, YouTube and broader programmatic buying | Contract complexity and ecosystem dependence |
| Ecommerce or CPG advertiser | Amazon DSP, compared with an independent platform | Shopper and purchase-related signals and Amazon-owned inventory | Validate incrementality and off-Amazon performance |
| CTV-heavy enterprise brand | The Trade Desk, DV360, Amazon DSP or a controlled multi-DSP test | Options for broad CTV access and cross-channel planning | Reach duplication, supply transparency and inconsistent measurement |
| Agency managing many clients | DV360, The Trade Desk or a specialist with strong agency support | Potential scale, account structure, workflow and reporting | Service model and markup can change economics |
| Mid-market advertiser without a large trading team | StackAdapt, Basis, Simpli.fi or a managed-service provider | Potentially more accessible activation and operational support | Verify controls, access and total cost for the specific buyer |
| Performance marketer with limited programmatic expertise | Managed-service DSP or agency partner | Reduces setup and optimization burden | Service fees and less direct buyer control |
| Advertiser prioritizing open-internet independence | The Trade Desk or another independent DSP | Alternative to depending entirely on a vertically integrated media platform | Independence does not guarantee lower fees or better performance |
| Regional or specialized campaign | Specialist DSP or local provider | Potentially relevant local inventory, service or targeting knowledge | Check scale and measurement consistency |
These are starting points for evaluation, not performance rankings. Confirm availability and commercial terms with the provider for the advertiser’s geography, account type and service arrangement.
When one DSP is enough—and when to test more
Concentrating spend in one DSP can simplify reporting, frequency management, operations and algorithmic learning; it may also help a buyer negotiate terms based on volume. The trade-off is greater dependence on one platform’s inventory, identity system, attribution and commercial incentives. A single platform can also miss incremental reach available elsewhere.
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The useful test is not simply one DSP versus several: does the second platform’s incremental reach, data or performance exceed its added platform and operating costs? Run a controlled comparison where possible, with aligned audience exclusions, periods, conversion definitions and measurement rules. CTV deserves particular care: households may be duplicated across services, co-viewing assumptions can differ, user-level conversion data may be limited, and available inventory does not equal incremental audience reach. IAB’s 2026 video materials discuss buyer concerns around transparency and audience information alongside growth: see its video ad-spend report and findings on business outcomes.
A practical DSP evaluation checklist
Use these questions in a vendor review or RFP. Ask each provider to answer for the proposed geography, channels, service model and contract rather than relying on generic product claims.
- Access: What inventory is actually available to this advertiser, through which buying paths, and with what eligibility or minimums?
- Unique reach: How will overlap across publishers, apps, devices and other DSPs be measured or controlled?
- Supply transparency: Can reports show publisher, app, content, seller and reseller path, and identify MFA or invalid-traffic exposure?
- Data: Which audiences use first-party, platform, retail or third-party data? What is the match rate, recency, geographic availability and separate cost?
- Optimization: What objective will the model optimize, what data threshold is required, and how can the buyer constrain or validate delivery?
- Measurement: What are the attribution windows and conversion rules? Can the advertiser use independent verification, a holdout or incrementality study?
- Economics: Provide a line-item estimate for platform, data, verification, serving, deal, agency and other fees, plus minimums and termination rules.
- Service and ownership: Who owns the account and data? What is exportable? Are markups, incentives and optimization decisions disclosed?
- Operations: What are onboarding timelines, creative requirements, reporting latency, API access, billing support and training?
- Evidence: Separate vendor case studies and product claims from independently validated results; specify the test design and comparable outcome.
For DV360, platform and third-party charges may be presented separately, and Google says applicable rates are contract-based rather than universal public rates. For Amazon, the announced 0% and 1% policies apply to specified deal and inventory categories, not every cost associated with a campaign. Ask every vendor for a comparable all-in proposal before moving budget.
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