Colab have become integral to this research landscape, offering powerful environments for running tutorials, complex simulations and computational workflows. However, these platforms are not without their challenges, including the management of server resources, potential latency issues, re-installations of packages for every new launch, and privacy concerns when handling sensitive data. In response to these challenges, we introduce SLMat-a serverless materials design toolkit that offers a scalable, efficient, persistent and user-friendly alternative for computational materials science, accessible directly from a web browser. SLMat is based on rapidly evolving platforms such as Pyodide and JupyetrLite . A schematic for SLMat and its features are shown in Fig. .