contractor on-site

temmet is a free browser-based timer with no accounts and no data sent anywhere. This recipe shows how to use it for site-based hourly work. Plumbers, electricians, gardeners, IT consultants on-site, anyone who arrives somewhere, does work, and leaves. The session is the visit.

for who

Trades and field consultants who bill by the hour and need a record of time spent on each job site.

the job

Track each job by address and customer, with start time, end time, and total labor cost. Roll up monthly for invoicing.

how to map it

1. One template per (job type, rate) pair. "Standard call-out · £75/hr", "Emergency · £120/hr", "Apprentice work · £40/hr". Single participant — yourself — at the relevant rate.
2. At the start of a visit, load the right template. One tap.
3. Set the session label to the address or job number. "12 Acacia Avenue" or "JOB-2024-0312". Keep it consistent so search works later.
4. Press TIME = MONEY when you arrive. Press esc when you leave.
5. At month end, export CSV. Every row is a visit with the rate, the duration, the address, and the labor total.

the remix

• Travel as separate sessions. Run a session for each leg of travel at your travel rate, labeled "travel · ". When you arrive, end that session and start a labor one. The CSV shows both lines per job.
• Multiple visits to the same job. The session label keeps them grouped — search by address to total up the labor across all visits.
• Add an apprentice as a second participant. When you bring help, add them as a second row at their rate. The total reflects both your time and theirs.
• Use history sorted by cost to find the high-revenue jobs. Useful when you're considering specializing or raising rates.

tips

• Mobile browsers can sleep mid-session. Turn on the wakelock setting before starting if you'll be off-screen for a while.
• The active session survives a tab refresh, so a phone restart at the customer's house won't lose your time.
• Back up data via JSON export at least monthly — your time records are also your tax records.
• The PDF report at the end of a visit makes a tidy customer receipt if you don't have a separate invoicing tool.