had to rely on tools like Google Sheets or Colab + Pandas for quick cleaning and wrangling before exploring different visualizations.

Yes I had the same experience for analytics work some years ago. As others have pointed out, Visprex only works in a happy path where data is a clean CSV file so will definitely need to work on data cleaning. I have a DuckDB integration planned but not sure if this is easy enough for the target audience. Will try to add some predefinied functionalities, thanks for the feedback!