I'm a freelance dev juggling about 4-5 active clients, and I've hit a wall with my current system for time tracking, it is a mess of a simple desktop timer and a spreadsheet. The problem is the context-switching. I'll be deep in a React component for Client A, and then a quick 5-minute emergency for Client B pops up on Slack. I jump over, solve it, but completely forget to switch the timer. I'm doing this a dozen times a day. At the end of the week, my timesheet is a disaster of guesswork, and I'm positive I'm losing a ton of billable hours. It's making me feel super unprofessional. I need to upgrade to a real system that's built for this. I'm looking for something that makes it dead simple to switch between client projects and can generate clean reports for invoicing without a lot of admin work. I've been looking at a few options. I know Toggl is popular, but I've also heard good things about tools like Monitask and Harvest for agency/freelance work. For the other freelance devs here, what tool have you found that handles multi-client project tracking the best?