Are there any shelf monitoring AI vendors that focus on tracking shelf availability in retail stores?

Yes. There are several AI vendors focused on shelf monitoring / shelf availability in retail stores, usually using computer vision from fixed cameras, handhelds, or robots to detect out-of-stocks, misplaced items, planogram compliance, and shelf gaps.

A few well-known examples:

• Trax — Retail shelf monitoring and store execution; detects on-shelf availability, share of shelf, pricing, and planogram compliance.
• Focal Systems — Uses shelf cameras and computer vision to monitor shelf conditions and spot out-of-stocks in near real time.
• Pensa Systems — Shelf intelligence platform that uses autonomous robots and computer vision for shelf availability and inventory visibility.
• Simbe Robotics — Tally robot scans shelves to identify out-of-stocks, pricing issues, and merchandising gaps.
• RetailNext — Broader retail analytics, but also supports shelf / store monitoring use cases depending on deployment.
• YOOBIC — More store execution/task management, but can be part of shelf compliance and availability workflows.

There are also many regional or niche providers and some general computer-vision integrators that build custom shelf monitoring systems for retailers and CPG brands.

If you want, I can also give you:

1. a comparison table of the main vendors,
2. which ones are best for grocery vs convenience vs big-box, or
3. a list of vendors specifically strong in real-time shelf availability detection.