AdvertiseCast

One of the largest independent podcast advertising marketplaces prior to acquisition by Libsyn, now operating as Libsyn Ads within the Libsyn ecosystem

AdvertiseCast, acquired by podcast hosting giant Libsyn in 2021 for approximately $30 million, operated as a specialized podcast advertising marketplace that bridged the gap between podcast creators and brands seeking engaged audio audiences. The platform centralized the historically fragmented podcast ad-buying process by offering tools for advertiser discovery, campaign booking, audience targeting, and performance reporting — all within a single unified interface. At its peak, AdvertiseCast represented one of the largest independent podcast ad networks, giving advertisers access to thousands of shows across a wide range of genres and audience demographics. Following the acquisition, AdvertiseCast was integrated into Libsyn's broader ecosystem, which already served as one of the world's leading podcast hosting and distribution platforms. The combination allowed Libsyn to offer end-to-end services for podcasters — from hosting and distribution to monetization via advertising. AdvertiseCast's technology and inventory were leveraged to strengthen Libsyn's ad sales capabilities, serving major media partners including ABC Audio. By early 2024, Libsyn formally rebranded AdvertiseCast as Libsyn Ads, folding the brand more plainly into the parent company's identity. While the AdvertiseCast brand has been retired, its infrastructure, marketplace model, and advertiser relationships continue to power Libsyn's advertising business. AdvertiseCast's legacy lies in helping professionalize and scale podcast advertising at a time when the medium was experiencing explosive growth, demonstrating that purpose-built AdTech could bring efficiency and transparency to audio media buying.