I began by explaining that in the experience of religion there is a contradiction between the individual’s desire for authentic experience and their need for relevant tools to engage individual growth vis-à-vis the project of Judaism. This contradiction is actually a design challenge for useful tools in Judaism’s toolkit of educational and spiritual resources for its participants. The imperfect present is expressed in many current expressions of the Siddur. Although a siddur’s nusaḥ is an authentic expression of a tradition, its utility as a static tool for engaging the creative improvisation required for sinciere spiritual expression (as well as its ability to serve as the traditional tool for educating Jews in sourcetext) is certainly questionable. Our solution is a siddur that is a Siddur that users can build for themselves. Ingredients from all available siddur texts (i.e., copyright permitting) will be available for building siddurim ranging from unchanged nusaḥ Ashkenaz, to mashups of different nusḥaot with additional prayers and art added by the user, with user edited translations they contribute to, and with commentary they share with other users. In this way, a siddur user becomes a sophisticated master of t’fillah, seriously engaged in the prayer authored and offered by Jewish tradition with the freedom to enrich the tradition from their own experience privately or publicly. . . .