Choose Free if you want to test Docsiv with a small number of clients and documents before paying.
Choose Pro if you need branded client delivery, reusable signing templates, document analytics, and more room to operate day to day.
Choose Agency if you run many client brands, need a custom domain, the highest AI allowance, unlimited signing, custom email sending, or higher-touch support.
The simple rule is: Free = trial the workflow, Pro = run client work end to end, Agency = run client work at agency scale.