Almost every general contractor starts COI tracking the same way: a spreadsheet, a shared folder, and a lot of email. It is free, familiar, and genuinely adequate when you have a handful of subs.
The trouble is what the spreadsheet cannot do. It does not collect documents, it does not store the actual PDFs, it does not read an ACORD form, and it will never warn you the night before a policy lapses. It depends entirely on a person remembering to look, which is exactly how coverage expires quietly and shows up at an audit or a claim.
CoiLoop keeps what works about the spreadsheet, a simple at-a-glance view of who is covered, and adds the parts a spreadsheet structurally cannot: no-login collection, AI that reads each certificate, and reminders before anything expires. It is free to start, so the upgrade does not have to come with an enterprise price tag.