Need help with elm-reactor?
Click the “chat” button below for chat support from the developer who created it, or find similar developers for support.

About the developer

418 Stars 62 Forks Other 625 Commits 45 Opened issues


Interactive development tool that makes it easy to develop and debug Elm programs.

Services available


Need anything else?

Contributors list

Merged into

Historical Note

In 2013, Laszlo Pandy figured out how to make a reliable Time Traveling Debugger for Elm. It became part of

in 2014 thanks to Michael James who adapted it for how we thought people would work with it in practice. Since then (1) the internal implementation of Elm has changed a decent amount and (2) we have learned a lot about what production users need to use this tool seriously. So time travel is not available in
right now, but it will be coming back with a new design focused on real workflows. I think this will lead us to a tool that is both more reliable and more broadly useful whether you are making games or web apps.

For now, the

module still makes it easy to peek at values in your program.

We use cookies. If you continue to browse the site, you agree to the use of cookies. For more information on our use of cookies please see our Privacy Policy.