I run two businesses — is one account enough?

One account, yes — but two lines: each business keeps its number, script, business identity in texts and separate lead accounting. Company A's calls never arrive signed with company B's name: the line carries the identity. The single dashboard gives you the overview, with per-business filters, and the monthly report distinguishes the two activities. That's the multi-line tier, from $499/month for two lines; if the two activities are very different — 24 h emergency and an appointment-based practice — thresholds and hours are set separately for each.