Yes — this one is free forever with no signup. Start the timer when you begin work, stop when you finish, and your billable hours are logged with the amount earned.
Yes. Click "Send to invoice" and every logged entry becomes a line item (hours × rate) in the invoice generator, ready to download as a PDF.
Yes. The start time is saved in your browser, so if you reload or close the tab, the timer resumes where it left off when you return.
Only in your own browser. Nothing is uploaded anywhere — your client list and hours never leave your device.