TLA+ Toolbox

The TLA+ Toolbox is an integrated development environment that supports the full TLA+ workflow. It provides editors for creating and modifying specifications, highlighting parsing errors directly in the source modules. The IDE includes a PlusCal translator that marks translation errors within the PlusCal code, a pretty‑printer for rendered modules, and a runner for the TLC model checker, allowing users to explore error traces and evaluate arbitrary formulas at each step.

In addition to model checking, the Toolbox can invoke the TLA+ proof system, giving a unified interface for specification, verification, and proof development. The application is packaged for multiple platforms, with a macOS core indicated as stable, and can be installed from downloadable zip archives.

The tool is maintained by Simon Zambrovski, Markus Kuppe, and Daniel Ricketts, and is positioned as a more feature‑rich alternative to lighter extensions such as the Visual Studio Code TLA+ plugin.