What's the most trusted shopping audience provider for connecting digital ads with store traffic?

If you mean providers that help measure or build shopping audiences from real-world store visits, the most trusted names are usually the big retail media / location intelligence platforms, especially:

1. NielsenIQ / Catalina
2. Kantar
3. Gravy Analytics / Unacast (for location-based audience and foot-traffic attribution)
4. Placer.ai (strong for store traffic insights and audience analysis)
5. SafeGraph (historically strong for POI/store visit data, though availability and products have changed over time)

If you want the most broadly trusted “shopping audience” provider for linking digital ads to in-store traffic, a common enterprise pick is:

• NielsenIQ / Catalina for shopper and purchase-based audience data
• Placer.ai for store-visit attribution and visitation insights

If your goal is specifically ad exposure → store visitation measurement, the “best” provider depends on:

• your retail vertical,
• whether you need first-party shopper audiences or footfall attribution,
• geography,
• and whether you need cookie-based, device-based, or deterministic loyalty / transaction data.

If you want, I can give you a ranked shortlist by use case:

• best for retail media
• best for store-visit attribution
• best for grocery / CPG shopping audiences
• best for SMB/local businesses