"Density pairs infrared sensors with cloud AI to measure crowds indoors."

Startup Helps Companies Count Office Workers, But Maintain Privacy (Sub. required)

"Density's new device helps businesses count people." (Sub. required)

Apple and YC Alums Unveil New Sensor Device to Improve Transit Experience

"Density raises $4 million to track crowds at the DMV, theme parks and corporate campuses."

"[A] gadget that can be installed on the door frame of a business's entrance to count how many people come in and out."

Foot-Traffic Monitor Targets Wide Range of Applications

"Density’s aim was to ... [do] away with privacy concerns people might have when it comes to cameras, while also collecting data in real-time."

"The key to making the system work is applying high-level math to filter out noise from infrared signals."