Glotaran is a Java-based graphical user interface (GUI) for the R package TIMP, designed to simplify the analysis of multi-dimensional data, particularly in time-resolved spectroscopy. TIMP is a command-line tool for fitting superposition models to multi-way spectroscopic data, but it lacks a user-friendly interface. Glotaran addresses this by providing an interactive GUI that allows users to explore data, build models visually, and inspect results dynamically. It is built on the NetBeans RCP platform and communicates with R via Rserve, enabling seamless integration with R's computational capabilities. Glotaran offers interactive data exploration, visual modeling, and interactive result visualization, making it easier for users to analyze complex datasets. It supports both time-resolved spectroscopy and microscopy data, with specialized editors for each. The application allows users to pre-process data, define models, and perform analysis with minimal effort. It also provides tools for inspecting results, including singular value decomposition (SVD) of data matrices and residual matrices, which help in assessing model fit and identifying potential misfits. The application is modular, allowing for easy extension and customization. It supports a project-based structure, enabling collaboration and sharing of datasets, models, and analysis schemes. Glotaran is open-source and cross-platform, available under the GNU GPL license. It is designed to be user-friendly, reducing the need for users to learn R syntax or TIMP-specific commands, while maintaining compatibility with existing TIMP models. Glotaran's design emphasizes modularity, ease of use, and integration with R. It uses JFreeChart for visualization and Rserve for communication with R. The application is intended for use in biophysics, particularly for analyzing time-resolved spectroscopy and microscopy data. Future work includes enhancing visual modeling, integrating with databases, and improving reporting functionality. Overall, Glotaran provides a powerful, user-friendly interface for advanced data analysis, making it accessible to a broader audience.Glotaran is a Java-based graphical user interface (GUI) for the R package TIMP, designed to simplify the analysis of multi-dimensional data, particularly in time-resolved spectroscopy. TIMP is a command-line tool for fitting superposition models to multi-way spectroscopic data, but it lacks a user-friendly interface. Glotaran addresses this by providing an interactive GUI that allows users to explore data, build models visually, and inspect results dynamically. It is built on the NetBeans RCP platform and communicates with R via Rserve, enabling seamless integration with R's computational capabilities. Glotaran offers interactive data exploration, visual modeling, and interactive result visualization, making it easier for users to analyze complex datasets. It supports both time-resolved spectroscopy and microscopy data, with specialized editors for each. The application allows users to pre-process data, define models, and perform analysis with minimal effort. It also provides tools for inspecting results, including singular value decomposition (SVD) of data matrices and residual matrices, which help in assessing model fit and identifying potential misfits. The application is modular, allowing for easy extension and customization. It supports a project-based structure, enabling collaboration and sharing of datasets, models, and analysis schemes. Glotaran is open-source and cross-platform, available under the GNU GPL license. It is designed to be user-friendly, reducing the need for users to learn R syntax or TIMP-specific commands, while maintaining compatibility with existing TIMP models. Glotaran's design emphasizes modularity, ease of use, and integration with R. It uses JFreeChart for visualization and Rserve for communication with R. The application is intended for use in biophysics, particularly for analyzing time-resolved spectroscopy and microscopy data. Future work includes enhancing visual modeling, integrating with databases, and improving reporting functionality. Overall, Glotaran provides a powerful, user-friendly interface for advanced data analysis, making it accessible to a broader audience.