Karbon is a practice management and workflow tool built around team collaboration — shared email, task management, and a client portal for document requests. ClientBrief takes just the document-collection piece and keeps it simple.
Karbon's Team plan runs $59/user/month on annual billing ($79/month if billed monthly), and the Business plan is $89/user/month annual ($99/month monthly, 3-user minimum). If your team just needs client documents in — not a full workflow and email-collaboration system — that's a lot of per-user cost for a piece ClientBrief covers for a flat $7.99/month.