You don’t think you need one, but you do.
Something to manage all your projects, your tasks, your ideas, your deliverables, your leads, your contacts, your customers.
Did I forget anything?
How much of that is rummaging around across a variety of disparate tools that you can barely manage on your desktop?
Pick a tool, use it for everything, get all your information together, make sure it works across all platforms you use (if it fails on one, don’t bother with it, move on).
Download everything in your head and start working on what you really should be doing, not what you’re trying to keep together.