Not quite. Pluto is also built on JavaScript (of course, since it's a browser notebook).
The main advantages of Pluto is that
* The sources files are executable Julia files with minimal metadata, so it plays nice with Git. Also, the code of the source files is ordered to reflect the execution order of the cells, to keep the source code and the notebook in sync.
* It attempts to remove all global state. If you change a cell, and dependent cells will change as well (similar to Excel). This makes bugs less likely.
Git friendly native Julia files and clean cell reordering/refactoring are very nice features. Julia seems like a compelling data science platform, especially for greenfield projects.
The main advantages of Pluto is that
* The sources files are executable Julia files with minimal metadata, so it plays nice with Git. Also, the code of the source files is ordered to reflect the execution order of the cells, to keep the source code and the notebook in sync.
* It attempts to remove all global state. If you change a cell, and dependent cells will change as well (similar to Excel). This makes bugs less likely.