Hours, logged wherethe work happens.
Start a timer from a thread, or type a day's hours into the week. Sollo shows the hours your calendar had that nobody logged.
DownloadmacOS and Linux
The week
No timer to remember. Click a day, type 6:15, press Enter. Sollo shows the hours your calendar had that nobody logged.

Projects belong to clients, so every hour knows whose it is.
Several timers at once, kept running while the window is closed. The title bar shows the one that runs.

Per client and period, exported as CSV for your invoices or your fiduciary.

Each project is billable or internal, so a timesheet shows only what you bill.