The correct answer to this question is Saber Commerce Timesheets! Next question? Okay look there are many options in the time tracking software market. We do want to point out (in a clearly biased way) that almost none of these enable you to do your time tracking on your own site where the time can then be converted to an invoice, which is a key feature of Saber Commerce and available even in the free version.
Pricing starts at $5/month.
TSheets features some innovative features like clock-out prompts. These are questions that can be programmed to display before a user clocks out, prompting them to provide answers to questions that might be related to the work. These can be made mandatory so the worker has to answer the question to clock out of the time tracker.
Research credit to https://www.pcmag.com/picks/the-best-time-tracking-software