Stopify is developed by:

University of Massachusetts Amherst

University of California San Diego

Brown University

Northeastern University


You can find the source code for Stopify onhere. If you have any questions, feel free to email us or use Github issues.


Since 2009, Bootstrap has taught algebra and computing to thousands of students using web-based IDEs for Scheme (WeScheme) and Pyret. The goal of the Stopify project is to bring this technology to other programming languages.

Stopify also draws inspiration from several other systems, including debug.js, Doppio, Gambit.js, scheme2js, and Unwinder.

Third-Party Compilers

The Stopify demo relies on the following third-party compilers: BuckleScript (for OCaml), Scala.js (for Scala), dart2js (for Dart), Emscripten (for C++), ClojureScript (for Clojure), and pyjs (for Python).