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Elm Editor

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What Elm Editor is

Elm Editor is a free, open-source web application for developing Elm programs. It lets you view and edit Elm modules alongside other project text files, then reports issues such as Elm compiler errors with visual markers and descriptions. Completion suggestions and hover documentation provide coding assistance. Projects can contain multiple entry points, including browser applications, and front-end web apps can be displayed and tested in an iframe. Elm Editor imports complete projects from public Git repositories and interfaces with GitHub and GitLab. You can save and share a project’s current state, including all files. The front end is mainly written in Elm and incorporates Monaco Editor from the VS Code project. Its open-source organization supports customization and deployment of custom instances. The maker says any modern web browser is sufficient. A stated limitation from October 2021 is that the built-in live view did not support custom HTML.

Who it suits

Elm Editor suits Elm developers who want browser-based editing, diagnostics, project sharing, and Git repository imports. It can also suit teams planning customized or self-deployed instances.

What it does well

  • Runs in any modern web browser
  • Shows compiler errors with visual markers
  • Provides completion and hover documentation
  • Imports projects from public Git repositories
  • Open source for customization and deployment

What to know first

  • Built-in live view lacked custom HTML support in October 2021
  • Focused on Elm programs and project files
  • Requires a web browser rather than a desktop app

Verdict

Elm Editor brings Elm editing, diagnostics, previews, and sharing into a browser. Its open-source structure supports custom deployments, while the documented live-view limitation may matter for projects using custom HTML.

Facts from Elm Editor's own pages

App preview
For front end web apps, it can display and test the app in an iframe. · discourse.elm-lang.org, 4 Oct 2026
Browser access
The front end is web based, and the maker says any modern web browser is enough to use it. · discourse.elm-lang.org, 4 Oct 2026
Code assistance
It offers completion suggestions and shows documentation and details on hover. · discourse.elm-lang.org, 4 Oct 2026
Diagnostics
It checks programs for problems such as Elm compiler errors and displays visual markers and error descriptions. · discourse.elm-lang.org, 4 Oct 2026
Editing
It supports viewing and editing Elm module files and other text files in a project. · discourse.elm-lang.org, 4 Oct 2026
Editor technology
Its front end is mainly written in Elm and integrates Monaco Editor from the VS Code project. · discourse.elm-lang.org, 4 Oct 2026
Git imports
It can import complete projects from public Git repositories and interfaces with GitHub and GitLab. · discourse.elm-lang.org, 4 Oct 2026
Maker-stated limitation
The built-in live view did not support custom HTML when the maker replied in October 2021. · discourse.elm-lang.org, 4 Oct 2026
Open source and deployment
The project is open source and organized for customization and deployment of custom instances. · discourse.elm-lang.org, 4 Oct 2026
Project scope
It supports projects with multiple entry points, including browser apps. · discourse.elm-lang.org, 4 Oct 2026
Project sharing
It can save and share a project’s current state, including all files. · discourse.elm-lang.org, 4 Oct 2026
Purpose
Elm Editor is a web app for developing Elm programs. · discourse.elm-lang.org, 4 Oct 2026

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