LISNR

LISNR is a Cincinnati-based technology company that moves data through sound. Its Radius ultrasonic SDK lets ordinary speakers and microphones transmit inaudible 'Smart Tones' between devices, enabling secure proximity detection, identity verification, and contactless transactions without Wi-Fi, Bluetooth, NFC, or QR codes. Founded in 2012 out of a 72-hour Startup Bus ride to SXSW, LISNR has grown into a data-over-audio leader backed by Visa, Mastercard, and Intel, serving payments, retail, mobility, and live-event clients.