Do “Web of Things platforms” truly follow the Web of Things?

The Web of Things (WoT) aspires to bring interoperability at the application layer, on top of the Internet of Things. Many state of the art platforms and frameworks claim to support the WoT, following its principles towards the seamless integration of heterogeneous physical devices and real-world services at the web. But do these platforms truly comply to the concepts of the WoT or only follow some of its characteristics? Do designers understand the WoT when claiming that their products follow the WoT specifications? This paper lists the main elements of the WoT, as defined by pioneering works in the field and examines 26 popular platforms and frameworks, aiming to shed light on how the WoT is understood and applied, both in academia and commerce.