The Data Visualizer

for most time i need show multi column as y axis

This is my favorite app to input data onto by far. It is very easy to use and the graphs turn out great. I bought the premium version and it is totally worth it because you have a lot of options to customize your charts. I do wish that they would add an option to change the color of the data line on the line graphs, but other than that you can customize everything. It has one major flaw. Sometimes, one of your saved charts will lose all of its data. You’ll open up the app and the file will be there but all the data and options are gone. I really hate it because I put in a lot of data and have to spend a lot of time to make the chart again. Please fix this because otherwise it is an amazing tool compared to similar apps. It always happens if my device dies with the chart open. It has also happens sometimes with no apparent cause.