LISNR ANNOUNCES OFFICIAL RELEASE OF RADIUS SDK FOR WEB BROWSERS
The new SDK lets web applications transmit and receive data over sound directly in standard web browsers, without requiring native mobile app downloads.
CINCINNATI, OH ā October 13, 2026 ā LISNR, a global leader in ultrasonic data-over-sound technology, today announced the official release of its Radius SDK for Web. This software development kit lets web applications transmit and receive Radius ultrasonic tones directly in standard web browsers, expanding web capabilities without requiring end users to download native mobile applications.
The Radius Web SDK enables developers and businesses to integrate proximity-based functionality into web applications. Primary use cases include web-based transit ticketing validation, interactive second screen media engagement, and proximity-validated retail-enabled experiences. Ultrasonic tones are a powerful tool for customer identification; they let businesses know who the consumer is when they are near the speaker and enable these personalized experiences.Ā
"Bringing Radius to web browsers represents a significant milestone in physical web technology. By enabling web applications to process data over sound, we are removing technical barriers and making proximity interactions accessible across standard web browsers."
Eric Allen, CEO of LISNR
The Radius Web SDK is available immediately for deployment. Organizations interested in evaluating or integrating LISNR web capabilities can learn more and contact us at www.lisnr.com or connect@lisnr.com.
About LISNR
LISNR powers secure and seamless data transmission using sound for ID verification, proximity marketing, and device-to-device transactions. Its patented ultrasonic RadiusĀ® SDK both challenges and complements conventional modalities (Bluetooth, NFC, QR codes), offering a versatile, offline-capable alternative requiring no special hardware.
LISNRās technology is critical to providing real-world context at the edge, converging physical and digital experiences in mobility, finance, broadcast media, hospitality, and live events. Learn more at lisnr.com.Ā
LISNR is privacy-first by design. The Radius SDK is built solely for real-time, data-over-audio transmission and does not record or store any audio. Presence is detected without GPS or background tracking; instead, a brief, inaudible audio signal is transmitted only at the moment of interaction. All integrations with consumer mobile applications strictly follow Apple and Google platform standards, requiring explicit user permission for microphone access. This ensures transparent, consent-based operation and full compliance with iOS and Android privacy requirements.
FOR MORE INFORMATION, CONTACT:
LISNR Marketing
Email: connect@lisnr.com
Website: www.lisnr.com












































































































