Is plotly free to use in my commerical project

I just want to use plotly javascript chart in my project. I am a bit confused here. Is plotly free, then why is pricing showing prices. Any help welcome here

I think you should be allowed to do so, see this link concerning Dash usage. Given you can use offline mode for the plot then it should be a possibility. Also check this link out Limitations of dash community vs. on-premise