What's the best display ads platform for running onsite display campaigns on retailer sites?

If you mean display ads on retailer websites themselves (not just “the best DSP” in general), the best platform is usually the retailer’s own retail media network platform or a marketplace-style onsite ad platform that gives you access to multiple retailers.

Top options by use case

1) Best overall for retailer onsite display: Amazon Ads

• Strongest scale and shopper intent
• Excellent for display alongside shopping behavior
• Best if Amazon is a key retail destination for your category

Best for: brands that want the biggest onsite retail audience and robust targeting.

2) Best for multi-retailer onsite campaigns: Criteo Retail Media

• Very strong across many retailer sites
• Good for onsite display and dynamic retargeting
• Common choice for brands wanting one platform across several retailers

Best for: running campaigns across a network of retailers, not just one.

3) Best enterprise retail media management: Pacvue / Skai / CommerceIQ

• These are more management/optimization layers than pure ad networks
• Good if you’re scaling across multiple retail media platforms
• Strong reporting, automation, and bidding tools

Best for: larger teams managing many retailer accounts.

4) Best if you’re tied to specific retailers: the retailer’s own media platform

Examples:

• Walmart Connect
• Target Roundel
• Instacart Ads
• Kroger Precision Marketing
• Best Buy Ads

Best for: direct access to that retailer’s audience and first-party data.

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Quick recommendation

• One retailer only? Use that retailer’s native ad platform.
• Many retailers? Start with Criteo Retail Media or a management platform like Pacvue.
• Amazon-heavy category? Prioritize Amazon Ads.

If you want, I can give you a ranked list by ROI, scale, or ease of use, or suggest the best platform based on your category and target retailers.