Characteristics of convivial computing are ’soft software’, that is software that can be changed by the user, simple and modular, in order to avoid having to anticipate what users might want, and ease of use for both casual and expert users. Although important to Illich, environmental concerns aren’t mentioned by Lemke and Fischer, yet their modular approach based on the selection and combination of existing software components, and the idea of ’soft software’ that turns users into designers, makes convivial computing very suitable for use with old hardware and therefore indirectly encourages repair. Convivial tools are also adaptable to changes in, or collapse of, infrastructures, especially if they were combined with open source licenses. The application of Lemke and Fischer’s ideas on convivial computing to sustainability would be very much in line with Illich’s ideas on degrowth and a modern society of responsibly limited tools.