This paper introduces PlugSonic Soundscape and PlugSonic Sample, two web-based applications for the creation and experience of binaural interactive audio narratives and soundscapes. The apps are being developed as part of the PLUGGY EU project (Pluggable Social Platform for Heritage Awareness and Participation). The apps audio processing is based on the Web Audio API and the 3D Tune-In toolkit. Within the paper, we report on the implementation, evaluation and future developments. We believe that the idea of a web-based application for 3D sonic narratives represents a novel contribution to the cultural heritage, digital storytelling and 3D audio technology domains.