Live version on free hosting: https://woj.heliohost.org/
The application is written in Javascript with React.js framework and lets you create and manage tasks and its operations. You can set time needed for completing an operation. You can also mark tasks as done.
It uses CodersLab API for storing data.
To work, you need to request API key here: https://todo-api.coderslab.pl/apikey/create and paste it in constants.js
file.
Example usage below.