This on-line application provides a standard dose-response analysis of growth toxicity test data under a Bayesian framework, including the automatic estimation of the x% effective toxicity value. Growth measurements used as inputs might be any quantitative continuous variable describing growth of organisms ( e.g., shoot length, dry weigh, size, weight…). This application makes it possible to analyse one single or multiple data sets and to get various outputs, such as a summary table of toxicity values estimates for a collection of several species.