Looker isn't no-code. A lot of people consider Looker a slightly more robust Tableau, but the visualization aspect is almost inconsequential. It's the data modeling part, the "this is exactly what structure my data takes and we define that in code", that matters. Otherwise what you get is "Here's my Tableau workbook with an unholy pile of hand-written untested SQL as custom data sources"

Incidentally I'm all ears if there's a good open-source LookML style project out there.