At i-dest.com, sustainability in tourism is assessed through a transparent methodology aligned with internationally recognised principles. The evaluation is based on the criteria of the GSTC (Global Sustainable Tourism Council), which examine environmental, social, economic and governance aspects, in line with the United Nations Sustainable Development Goals (SDGs). All destinations, attractions and service providers are assessed using a unified framework. The results are presented through a 1–4 level sustainability rating, offering a quick and comparable overview of overall performance, while also showing percentage scores by thematic area to highlight strengths and areas for improvement.

In addition to numerical and visual indicators, I-DEST places strong emphasis on clear, accessible explanations. For each location, we describe what the destination or service provider actively does to support sustainability—such as nature conservation, support for local communities or responsible operations—and what visitors can do to make conscious, environmentally and socially responsible choices during their travels.