ISNetworld (ISN) is a heavyweight contractor and supplier prequalification network, strongest in oil and gas, utilities, and heavy industrial, where facility operators run strict safety programs. It does far more than COI tracking: safety statistics, training, OSHA logs, financial review, and qualification across a network of tens of thousands of contractors.
If that is the problem you have, ISN is built for it. But it comes with weight and cost that do not fit most building general contractors. Subcontractors typically pay an annual subscription, often several hundred to a few thousand dollars per year, plus a setup fee, just to be in the network, and the platform is far broader than collecting and checking certificates.
CoiLoop collects COIs and W-9s through no-login links, prefills certificate reviews with AI and tracks separate GL and workers' comp dates. Pro adds scheduled expiry emails and audit exports. It is free to start, your team approves each certificate, and subs do not pay to upload documents.