For existing SQL tools there's currently basically two approaches: where either the full application is hosted, or where the full application is local.
Jupyter and Zeppelin generally fall into the second category— you have to set up Docker (or the myriad of dependencies), and edit a bunch of configuration files to launch a local server before getting started. If someone sends you a notebook, and you just want to read its contents and see the interactive charts, you still have to go through this ordeal.
On the other hand, there's Mode, Redash, and PopSQL, which are hosted solutions. Editing configuration files is replaced with a one-time setup and registration, but you have to entrust these startups with access to all your data.
Franchise takes a hybrid approach— it's a hosted static web page that contains all of the display logic, so if you save a notebook and share it with a friend, you can open it and it just works. To connect to a database, you start a local bridge which tunnels data from Franchise directly to your database through your computer.
We spent a lot of time thinking about the interface and trying to make it easy to use, but still powerful. We built a new notebook layout engine that allows you to run two queries and see the results side-by-side. Deleting a cell sends it to an archive, so you don't have to worry about losing data. Data visualizations are accessible with one click. And if you're just trying to query data on a CSV or JSON file, you can just drag and drop it onto the page.