## 1 Introduction  
Accessible tourism seeks to enable people with specific needs (PwSN--people with physical, intellectual, visual and hearing disabilities and people with other special needs, such as seniors, pregnant women, parents with baby strollers, people with respiratory allergies, and people with food allergies) to access tourism products and services with autonomy, equity, and dignity [1]. In this context, information plays an important role [2, 3, 4], and information systems can facilitate access to secure and reliable information about tourism products and services, thereby reducing the travel constraints that PwSN face when participating in tourism activities [5, 6]. In fact, information systems allow PwSN easy access to a range of tourism activities, contributing to better tourism experiences. However, despite this clear relevance, there is currently an evident lack of web platforms promoting accessible tourism which, at the same time, serve the needs of all stakeholders and contribute to increased stakeholder involvement in the accessibility issue [[PERSON] et al., 2020]. Taking into account the literature, but also practical applications, the few technological solutions that exist in this area, especially platforms capable of integrating simultaneously the needs of the different stakeholders of the accessible tourism market (demand; supply agents and tourism education institutions) do not meet the needs of all stakeholders, representing standalone solutions. It is also worth mentioning that web applications, when alignedwith the needs of PwSN, may represent adequate solutions to promote information sharing and enhance communication between all stakeholders involved in accessible tourism. Considering the gap reported above and the potential of web platforms, the aim of this study is to understand how a web application for promoting accessible tourism should be developed, starting by mapping and benchmarking applications currently available in the market. However, no study is known that compares these platforms in terms of scope and functionalities. Therefore, the main contribution of this paper is to increase knowledge in this field by analyzing a group of existing platforms for the accessible tourism market and proposing a new platform. Thus, the specific aims of this paper are: (i) to examine the existing accessible tourism platforms, to understand how they work, the users involved and their main functionalities; (ii) to propose a new innovative and collaborative platform--_access@tour by action_.  
To accomplish the above-mentioned purposes, this paper is structured in six parts. After this introduction, a literature review is provided about the characteristics of the accessible tourism market and how digital platforms can improve accessibility conditions for people with special needs in tourism activities. In the third section, the methodology used to collect and analyze the data is explained. In the fourth part, the web platforms for the accessible tourism market available on the market are characterized and compared. Afterwards, a brief description of the created platform--_access@tour by action_--is provided, highlighting the most innovative aspects. Lastly, the final section presents the main conclusions and contributions of this study.