Manual Overtime Tracking Add-On

I want a straightforward add-on that lets my team log overtime hours by hand and see the totals at a glance. Time tracking is the only function I need—the tool does not have to handle tasks, reporting, or anything else.

Platform is flexible. If you can build this in Excel, Google Sheets, Asana, or another familiar workspace, I’m open to whichever option delivers the smoothest manual entry experience.

Core expectations
• Simple input form or fields where users type date, hours worked, and a short note
• Automatic calculation of daily and cumulative overtime based on a configurable threshold (e.g., anything over 8 h/day)
• Clear summary view that refreshes instantly so managers can review weekly or monthly totals
• Basic safeguards against accidental overwrites or duplicate entries

Deliverables
1. Fully functional add-on installed in the agreed-upon platform
2. Brief setup guide plus one-page user instructions
3. Source file or code so we can adjust thresholds later

Acceptance criteria
• Manual entry works in the live environment without errors
• Totals update correctly after each save
• No dependency on paid third-party services

If you have experience building lightweight time trackers and can turn this around quickly, I’d like to get started right away.