Cosign is an AI-focused legal technology brand designed to help small law firms organize matter context and produce review-ready legal work while keeping attorneys in control. Its approach connects information about clients, matters, and sources, supporting continuity as legal work develops. Users can choose how a matter begins, and Cosign says it keeps the relevant context connected from that point onward.

The service is presented for lawyers and also offers an entry point for individuals, with a sample matter available to explore. The site additionally lists Cosign References, Agent Commerce, and Cosign License Records as other offerings, alongside legal and privacy resources. These include terms of use, a privacy policy, a disclaimer, a Trust Center, and information about subprocessors.

Cosign positions its tools around matter-aware AI for small law firms, emphasizing organized context and attorney oversight rather than autonomous legal decision-making. The available information does not specify pricing, integrations, or detailed functionality, but describes a platform intended to support law firm workflows and legal work preparation