ASTRAEA (Adaptive System for Transformational Resilience and Analytical Equity Assessment), an innovative digital tool, functions as a Climate Equity Index (CEI) to improve urban equity and sustainability, as well as resilience. By pinpointing city areas with limited opportunity access, it utilizes 30 carefully chosen indicators based on international best practices research. These indicators assess various city-wide equity aspects, offering an in-depth understanding of disparities and guiding focus areas, including strategic measures, fund distribution, and implementation efforts.At the heart of ASTRAEA's utility is its support in decision-making for both public and private organizations. The tool's detailed, data-driven insights bolster the city's efforts to safeguard vulnerable communities. It steers policymakers and stakeholders toward crafting and applying resource-focused policies. ASTRAEA strives to enhance public facilities and services e.g. boosting accessibility and mobility for the elderly, disabled, low-income, and other marginalized groups, addressing issues like urban heat, optimal resources utilization etc. Furthermore, ASTRAEA is instrumental in evaluating and recommending actions to counteract climate change’s effects on human health, social inequities, critical infrastructure, environmental, and economic imbalances. It offers a framework for city planning to enhance preparedness and resilience adaptation strategies, emphasizing the mitigation of risks and lack and vulnerabilities of specific communities. A key feature of this tool is its directive for city staff to focus on 'Communities of Concern' when investing in green, climate-neutral, and smart initiatives, thereby ensuring a fair and equitable distribution of benefits and overcoming historic obstacles that have led to disparities.The climate equity index (CEI) of ASTRAEA calculated here is a composite score that aims to represent the relative status of different neighborhoods in terms of climate equity. A higher CEI score indicates better climate equity, considering factors like green space, transportation, existing infrastructure and socio-economic factors. Lower scores signal areas needing targeted interventions. It's a relative measure, not absolute, facilitating comparisons between neighborhoods. Context matters, and weight adjustments can emphasize specific sustainability and equity aspects. Additionally, ASTRAEA integrates the use of participatory tools, including questionnaires, to gather feedback and engage with citizens effectively. These questionnaires are available for both decision-makers and citizens, enhancing stakeholder engagement. Initially applied in the city of Athens, ASTRAEA is designed to be scalable, replicable and adaptable, allowing for potential duplication in other cities. The approach is against multi-hazard scenarios, ensuring comprehensive coverage and responsiveness to a variety of climate-related challenges.