If you're looking for a no-frills tracker, Google Sheets has a free to-do list template with columns for tasks and due dates. Clicking the checkbox beside the task indicates that it is complete.

Google Sheets excels (no pun intended ... Next, add columns for each day and use the checkbox to track its progress. You ...

However, do you know that you can make a curved line graph in Excel or Google Sheets ... After that, make a tick in the Smoothed line checkbox. You can find the conversion immediately.