We introduce the new, improved version of the Haskell Equational Reasoning Assistant, which consists of an Ajax application for rewriting Haskell fragments in their context, and an API for scripting non-trivial rewrites. Categories and Subject Descriptors D.2.6 [Software Engineering]: Programming Environments – Interactive environments, Programmer workbench. General Terms Design, Experimentation, Languages, Performance, Reliability. Keywords Equational Reasoning, Transformation Tools, Ajax Applications.