re:dash is very cool, and we actually used an early version way back.
The primary difference is audience. Most of the impetus to build it came from the difficulties we had getting non-analysts to do their own data pulls and ad hoc queries. While some number of people were able to edit SQL others had written for them, it rapidly became unsustainable.
As a consequence of the audience, we have lots of ancillary features (like the ability to see detail records and walk across foreign key links, the data reference, etc) that fell out as we learned how people used the tool.
How does it compare to re:dash? https://github.com/EverythingMe/redash
Metabase seems to have a GUI to construct SQL queries which re:dash doesn't. What else is different?