Project management software

I'm looking for an iOS app or a website where I can manage the tasks and estimate the time for my projects.

Features I'm looking for :

• List of task to do
  
• Number of days or hours for each task
  
• Estimated date to complete the project according to the number of hours per week spent on the project
  
• Issue tracker
  

That's about it. I don't need team management of collaborative features because it's for my personal projects.
What do you use to plan and manage your projects? Any suggestions?