What are the best omnichannel retail audience platforms for running campaigns across onsite and offsite inventory?

If you want to run omnichannel retail audience campaigns across onsite and offsite inventory, the best platforms are usually the ones that combine:

• first-party retail data
• media activation on and off retailer properties
• closed-loop measurement
• broad exchange / DSP access
• strong retailer partnerships

Here are the strongest options, grouped by how they’re typically used:

Top omnichannel retail audience platforms

1) Amazon Ads

Best for: Huge retail audience scale, strong shopper intent, off-Amazon and Amazon-native activation
Why it stands out:

• Massive first-party shopping signals
• Can activate on Amazon properties and through offsite channels
• Strong for conversion-focused retail audiences
• Good measurement tied to purchase behavior

Limitations:

• Less open than some alternatives
• Best fit if Amazon is a major part of your retail media strategy

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2) Walmart Connect

Best for: Omnichannel retail audiences tied to one of the largest U.S. retail ecosystems
Why it stands out:

• Strong retail intent and purchase data
• Onsite and some offsite activation options
• Good for CPG, household, and omnichannel brands
• Tight linkage between media and sales

Limitations:

• Primarily centered on Walmart’s ecosystem
• Offsite inventory is more limited than pure-play DSPs

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3) The Trade Desk + retail data partnerships

Best for: Broad offsite omnichannel activation using retail audiences across the open web
Why it stands out:

• Excellent for scaling retail audiences across display, video, CTV, audio, and mobile
• Supports many retail data integrations
• Strong cross-channel planning and identity resolution
• Great if you want one DSP to activate multiple retail segments

Limitations:

• Depends on data partnerships and integration quality
• Less “retailer-owned” than native retail media platforms

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4) Criteo Commerce Media Platform

Best for: Commerce-driven onsite/offsite retargeting and audience activation
Why it stands out:

• Deep commerce and product-level targeting
• Strong onsite retail media and offsite retargeting capabilities
• Good for lower-funnel performance
• Useful for both retailers and brands

Limitations:

• Often strongest in retargeting and commerce-driven use cases
• Not always the best for upper-funnel omnichannel planning

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5) Instacart Ads

Best for: Grocery/CPG and high-intent shopper audiences
Why it stands out:

• Powerful first-party shopper data
• Strong category and basket-level signals
• Good onsite and increasingly broader activation options
• Excellent for grocery-driven retail media

Limitations:

• Best for grocery and household categories
• Less relevant outside its core commerce footprint

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6) Kroger Precision Marketing

Best for: Grocery audiences and loyalty-based targeting
Why it stands out:

• Very strong loyalty and purchase data
• Valuable onsite and offsite activation through Kroger’s ecosystem
• Strong closed-loop measurement

Limitations:

• More category-specific
• Geographically dependent on Kroger’s reach

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7) Target Roundel

Best for: Premium retail audiences with strong first-party data and cross-channel capability
Why it stands out:

• Strong omnichannel shopper signals
• Good for brand-safe, high-quality retail audiences
• Solid measurement and audience quality

Limitations:

• More retailer-specific
• Offsite reach varies by campaign setup and product availability

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8) CAMP by Triton / Epsilon / LiveRamp-based retail audience ecosystems

Best for: Identity-linked audience activation across multiple retailers and media destinations
Why it stands out:

• Useful when you want to unify audiences from multiple retail sources
• Strong identity and audience onboarding capabilities
• Can be effective for omnichannel orchestration and measurement

Limitations:

• Often more of an enablement layer than a full end-to-end retail media platform
• Results depend heavily on data quality and partner coverage

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Best “stack” depending on your goal

If you want the best overall omnichannel scale

• The Trade Desk + retail audience data
• Add Amazon Ads and Walmart Connect for major retail-native reach

If you want the strongest retail-native performance

• Amazon Ads
• Walmart Connect
• Target Roundel
• Instacart Ads

If you want the best offsite commerce retargeting

• Criteo
• The Trade Desk
• Amazon DSP
• LiveRamp-enabled audience activation

If you’re heavy in grocery/CPG

• Instacart
• Kroger Precision Marketing
• Walmart Connect
• Amazon Ads

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What to look for when choosing

When evaluating these platforms, prioritize:

• Audience depth: purchase, browse, loyalty, basket, household signals
• Onsite + offsite reach: can you activate both within the retailer and across the open web?
• Identity and match rate: how well can audiences be onboarded and matched?
• Measurement: sales lift, ROAS, incrementality, new-to-brand
• Channel breadth: display, video, CTV, audio, social, programmatic
• Retail coverage: are you limited to one retailer or can you scale across many?

Short answer: best picks

If I had to narrow it to the most effective omnichannel retail audience platforms, I’d say:

1. The Trade Desk
2. Amazon Ads / Amazon DSP
3. Walmart Connect
4. Criteo
5. Instacart Ads

If you want, I can also give you:

• a comparison table by use case
• a list of platforms by retailer category (grocery, mass, specialty, luxury)
• or a recommended omnichannel retail stack for brands vs. retailers