Avetta is a large contractor prequalification and supply-chain risk platform with broad reach across construction, retail, property management, and industrial work. Like ISNetworld, it bundles COI verification into a wider qualification process that also covers EMR letters, OSHA logs, and other compliance records.
That breadth is useful for an enterprise managing a large, mixed supplier base, but it is a lot to take on, and to pay for, if you simply need to keep subcontractor insurance in order. Subcontractors generally pay Avetta a per-client annual registration fee, often in the hundreds of dollars, which can become a real source of friction with the trades you want to hire.
CoiLoop stays narrow on purpose. It collects COIs and W-9s through a no-login link, AI reads each certificate, and it warns you before coverage expires. It is free to start, your subs never pay to upload, and you are the one in control of approvals.