[1] For much of its history, it was partnered with another EveryWare product, Tango (released 1995),[2] that built dynamic database pages from SQL data.
Butler SQL ceased development when Pervasive Software acquired EveryWare in 1998;[3][4] Tango was sold by Pervasive to Australian firm Witango Technologies in 2001 and renamed to Witango,[5] then subsequently acquired by Tronics Software in 2010 and renamed to TeraScript.
To address the concern that a single DAM program might want to work with different back-end databases, Apple used a second system known as the Data Access Language (DAL), which was a variant of SQL that included additional flow-control and data manipulation instructions.
Butler suffered from performance problems due to the single-user nature of the Mac OS.
The review called the Butler-Tango suite useful for small databases but "cumbersome for building and managing large databases containing many tables, largely due to the tools' inability to display relationships between tables graphically.