The quality of RDF based solutions requires the possibility to describe and validate RDF graphs. In the recent years, two technologies have been proposed for RDF validation: ShEx and SHACL. RDFShape is a web service that can be used as an RDF playground to validate RDF with those technologies, but can also be used as a general RDF playground allowing to parse, convert, visualize and query RDF data. The validation engine supports both ShEx and SHACL, allows the conversion between different schema formats, and is able visualize schemas using UML-like class diagrams. The system offers the possibility to play with different RDF technologies in a unified setting and has already been used to teach RDF technologies in several courses and tutorials. It has also been employed in industrial RDF workflows that needed a web service for RDF data validation and management.