Startup Idea: Single Page Time-Tracking in Scrum Workflow Tool

Startup idea to develop a single page application that visualizes the time spent on each task per day by each team member. This solution is intended for teams practicing scrum, providing more efficient and transparent time tracking than the existing tools in popular project tracking software like JIRA.

I'm a software engineer working for an e-commerce website. I work in a team of around 10 developers and we follow scrum practice. We have 2 weeks long sprint and use JIRA software to keep track of our work. Scrum master assign work, called story, to developers and make sure that people have things to work on. The problem is that it's hard to keep track of who's doing what at a given moment. Some people may slack off and just say that they worked on some task. It's hard to visualize who worked on what task for how long. We're using commenting functionality on the story itself but no one is going to go into each story and calculate how much time is spent on what. I think we need a single page that visualize how much time is spent on what task per day. No. Haven't found solution. Right now the visualization in JIRA is not that solving the problem I discussed above.