This was (understandably) requested many times, so we of course built it. If you want to persist a chart, just hit save. You'll find your saved charts in the Manage charts view or through a project directly.
Do you have custom weights you want to apply to your visualizations, to scale your sample correctly? Given you have a column with the weights in the file you uploaded, you'll be able to chose that in the visualizations.
Custom chart colors
Want to create your charts in colors that match your corporate identity? Send our team one or more color palettes and we'll set your account up accordingly.