On making tools for things I once had to do iteratively. I want to use some of my free time to see if people will use my programs. The last one I have been work

On making tools for things I once had to do iteratively. I want to use some of my free time to see if people will use my programs. The last one I have been working on is a curve-fitting web app (https://fittapp.streamlit.app/ https://fittapp.streamlit.app/). I do a lot of data science and analytics in my real job.