What should a genuinely free employee time clock include?

For small teams, a time clock should be useful before it asks for a credit card. We built TotemClock AI around that idea: a free daily calculator for clock-ins, clock-outs, breaks and potential overtime, plus an optional free cloud app for employees and whole months.

A practical example: 08:00–12:30 and 13:30–17:30 = 8h30 worked, with a 1h break.

You can try the calculator without signing up: https://totemclock.com/en/worked-hours-overtime-calculator/?utm_source=producthunt&utm_medium=forum&utm_campaign=prelaunch

What is the one feature a genuinely free employee time clock must get right?