LAPSyD, the Lyon-Albuquerque Phonological Systems Database, is an online phonological database equipped with powerful query, mapping and visualization tools. It stems from the UPSID and WALS databases, enhanced with newly validated data not only covering segmental inventories but also syllable structures, stress and tonal systems. In its current version it covers around 700 languages and it is accessible at http://www.lapsyd.ddl.ish-lyon.cnrs.fr. This paper provides a description of the data structure in LAPSyD and the features of the interface. Brief illustrations of the types of analysis that can be done with this tool are provided, exploiting the ability to cross-reference data on segments, other phonological properties and language location.