Smith.ai vs. Ruby vs. an AI Receptionist: Which Fits a Small Business?

If you've researched answering services, you've met the two best-known live-agent brands — Smith.ai and Ruby — and, more recently, a wave of AI receptionists. They solve the same problem (never miss a call) in very different ways and at very different prices. Here's how to think about the three for a small business.

The two models

Live-agent services (Smith.ai, Ruby) staff real people who answer in your business name. The appeal is a human on every call; the trade-offs are price and the limits of staffing.

AI receptionists use natural-voice software trained on your business. The appeal is 24/7 coverage, simultaneous calls, and flat pricing; the trade-off is that the rare call needing a human gets transferred or taken as a message rather than handled start-to-finish by a person.

How they compare

	Smith.ai / Ruby (live agents)	AI receptionist
Who answers	Trained human agents	Natural-voice AI, your rules
Hours	Business hours; after-hours often costs more	24/7, included
Simultaneous calls	Limited by staffing	Many at once
Books on your calendar	Sometimes, higher tiers	Yes
Pricing model	Per call / per minute, premium	Flat monthly, low overage
Typical cost	Several hundred to $1,000+/mo	~$49–$300/mo
Best at	Complex, high-touch, emotional calls	Routine calls, booking, 24/7 coverage

(For live-agent pricing specifics, check each provider directly — plans and per-call rates change.)

Where live agents win

• Complex or sensitive conversations that need human judgment or empathy.
• Brand feel — some firms want a person on every call as a point of principle.
• High-touch intake where an experienced agent adds real value.

Where an AI receptionist wins

• 24/7 coverage without after-hours surcharges — nights and weekends included.
• Call volume spikes — it answers many calls at once instead of queuing.
• Booking on the call against your real calendar.
• Cost and predictability — a flat monthly fee instead of a per-minute meter that punishes busy months.

How to choose

Ask what most of your calls actually are:

• If they're mostly routine — hours, pricing, booking, messages — and you want round-the-clock coverage at a predictable price, an AI receptionist is usually the better fit.
• If nearly every call is complex, high-touch, or emotional, and your margins support a premium per-call price, a live-agent service may be worth it.
• Many businesses do best with a hybrid: AI answers everything 24/7 and handles the routine 80%, transferring the few calls that genuinely need a person.

See the detailed breakdowns

GreetWise is an AI receptionist built for small business — 24/7 answering, booking, and a flat plan from $49/month. We keep head-to-head pages with sourced details: GreetWise vs. Smith.ai and GreetWise vs. Ruby. For the money side, see how much an answering service costs, or start a free 14-day trial.