You built a sheet. It works. It also doesn't text the customer.
Research on construction spreadsheet use is sobering: roughly 88% of construction spreadsheets contain errors, and the U.S. construction industry loses billions a year to spreadsheet mistakes (source). But that's not really the issue for a 1-truck plumber. The issue is your sheet doesn't have a phone number for the customer, and even if it did, it can't send a text. CurbBid can.
Your sheet is your 'system.' Your phone has no record.
A spreadsheet keeps a list. It doesn't keep a conversation. When a homeowner says, 'you said the water heater install was $1,800,' your sheet has the number — but it doesn't have the quote you sent, the date, or whether they approved it. CurbBid keeps the whole thread, with timestamps, in one place.
You spend Sunday updating the sheet. Your wife's tired of it.
Manual data entry into a spreadsheet eats hours every week. Industry research shows business owners commonly spend 4–6 hours per week per employee on spreadsheet babysitting (source). CurbBid is built to be fast to set up and almost nothing to maintain — the daily upkeep is roughly: send a quote, send an invoice, get paid. The follow-ups, reminders, and review requests run themselves.