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 brings document status, no-login collection and AI-prefilled review together. Both plans track separate GL and workers' comp dates; Pro adds scheduled expiry emails and work-period audit exports. Free includes 20 subs, one project and one user.