Time tracking sounds simple. Start a timer when you work. Stop it when you don't. But the difference between a good time tracking app and a bad one is the difference between actually using it and abandoning it after a week.
Clockify
Clockify is free for unlimited users and unlimited tracking. No catches, no time limits, no feature gates on the core tracking. It has a browser extension, desktop app, and mobile app. Reports are clean enough for client invoicing. The free tier is genuinely generous. Most solo freelancers will never need to upgrade. Where it's weak: project profitability analysis and invoicing require paid plans. Best for freelancers who want a simple, free timer.
Toggl Track
Toggl Track has the most polished interface of the three. The one-click timer, keyboard shortcuts, and idle detection (it notices when you stop working and asks what to do with that time) make it the easiest to actually use consistently. The free tier supports up to 5 users with basic reports. Paid plans ($10–$20/user/month) add billable rates, project budgets, and client invoicing. Best for freelancers who want the best tracking experience and don't mind paying for it.
Our pick for best experience
Toggl Track
The most polished time tracker of the three. One-click timer, idle detection, and clean reports make it the easiest to actually stick with.
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Harvest
Harvest combines time tracking with invoicing and expense tracking in one tool. You track time, generate invoices from tracked hours, , all in the same place. Integration with Stripe and PayPal means you can accept payment directly from invoices. Pricing is $10.80/month per seat. Best for freelancers and small agencies who want time-to-invoice in a single tool.
The Link to Your Rate
Time tracking only matters if you know what your time is worth. Use our Freelance Rate Calculator to set your rate, then use your time tracker to make sure you're billing for every hour. At $60/hour, one unbilled hour per week costs you $3,120/year.
Our recommendation: Start with Clockify (free, no commitment). If you find yourself wanting a better experience, try Toggl's free tier. If you need invoicing built in, go with Harvest.