INDperform is an R package for validating the performance of ecological state indicators and assessing the ecological status based on a suite of indicators. It implements a novel quantitative framework for selecting and validating the performance of state indicators tailored to meet regional conditions and specific management needs as described in Otto *et al.* (2018). The package builds upon the tidy data principles and offers functions to * identify temporal indicator changes, * model relationships to pressures while taking non-linear responses and temporal autocorrelation into account, and to * quantify the robustness of these models. These functions can be executed on any number of indicators and pressures. Based on these analyses and a scoring scheme for selected criteria the individual performances can be quantified, visualized, and compared. The combination of tools provided in this package can help making state indicators operational under given management schemes such as the EU Marine Strategy Framework Directive.