for consultancies, agencies and anyone who quotes and invoices. write the proposal, get it e-signed, do the work, send the invoice, get paid — all on one customer record. no copy-pasting the same details into a separate quoting tool and a separate accounts package.
the customer portal and your public website run on your own domain, with your branding. clients log in to see proposals, invoices and tickets in one place — not five different vendor logins with five different passwords.
begin on the crm-first tier at £19 a seat. when the work grows into support contracts or field jobs, the helpdesk and dispatch are already there on the same record — you turn them on, you don't migrate again.