AI receptionist vs a live answering service
A live answering service puts trained people on your phone line and charges by usage: Ruby runs from $250 a month for 50 minutes to $1,725 for 500, and Smith.ai from $300 a month for 30 calls to $2,100 for 300, per their pricing pages on October 5, 2026. An AI receptionist answers every call at once, around the clock, knows your services and prices, and books the job, without per-minute meters. Choose a live service when callers need a human for sensitive or complex conversations. Choose an AI receptionist when volume, after-hours calls and cost per call matter, and when you want it to book straight into your calendar.
Last checked October 5, 2026. Competitor facts are from their own pages, linked below.
Live answering service (Ruby, Smith.ai) vs AI receptionist by Modern Mustard Seed
| Factor | Live answering service (Ruby, Smith.ai) | AI receptionist by Modern Mustard Seed |
|---|---|---|
| Who answers | Trained human receptionists. Ruby describes itself as "100% live." Smith.ai offers AI-first and human-first plans. | An AI voice agent in a natural voice, trained on your business facts. |
| Price model | Ruby: $250 for 50 minutes, $395 for 100, $720 for 200, $1,725 for 500 a month. Smith.ai: $300 for 30 calls, $810 for 90, $2,100 for 300 a month, overage $8.50 to $11.50 a call. | Set package price, quoted after a free discovery call |
| Hours | Both advertise 24/7 coverage. | Every hour of every day, and every call at once. |
| Booking | Smith.ai lists appointment booking as a $1.50 per-call add-on. | Books into your calendar on the call. |
| Busy seasons | Cost rises with call volume. | A storm day costs the same as a quiet one. |
| Ownership | A service you subscribe to. | Configuration, voice and data in accounts you own. |
Who answers
Live answering service (Ruby, Smith.ai)
Trained human receptionists. Ruby describes itself as "100% live." Smith.ai offers AI-first and human-first plans.
AI receptionist by Modern Mustard Seed
An AI voice agent in a natural voice, trained on your business facts.
Price model
Live answering service (Ruby, Smith.ai)
Ruby: $250 for 50 minutes, $395 for 100, $720 for 200, $1,725 for 500 a month. Smith.ai: $300 for 30 calls, $810 for 90, $2,100 for 300 a month, overage $8.50 to $11.50 a call.
AI receptionist by Modern Mustard Seed
Set package price, quoted after a free discovery call
Hours
Live answering service (Ruby, Smith.ai)
Both advertise 24/7 coverage.
AI receptionist by Modern Mustard Seed
Every hour of every day, and every call at once.
Booking
Live answering service (Ruby, Smith.ai)
Smith.ai lists appointment booking as a $1.50 per-call add-on.
AI receptionist by Modern Mustard Seed
Books into your calendar on the call.
Busy seasons
Live answering service (Ruby, Smith.ai)
Cost rises with call volume.
AI receptionist by Modern Mustard Seed
A storm day costs the same as a quiet one.
Ownership
Live answering service (Ruby, Smith.ai)
A service you subscribe to.
AI receptionist by Modern Mustard Seed
Configuration, voice and data in accounts you own.
When a live answering service is the better choice
- Your callers are often distressed or need a human judgment call on every conversation.
- Your call volume is low and steady, so a small minute bucket covers it.
- Your industry or clients require a human to answer.
When we are the better choice
- You miss calls during busy seasons, storms or after hours.
- You want every caller qualified and the job booked on the first call.
- You want the receptionist to know your exact services, service area and process.
- You do not want a bill that rises with every ring.
Which one fits you
Pick: Live answering service
A family law practice with emotional first calls
A human voice matters most on those calls.
Pick: AI receptionist
A roofer after a hailstorm
Hundreds of calls at once, every one answered and booked.
Pick: AI receptionist
An HVAC company with heavy after-hours emergencies
Answers at 2 a.m., triages the emergency, books the visit.
Pick: Either
A solo consultant with five calls a week
Low volume. Pick on voice and how you want callers handled.
Common questions
How much does Ruby cost?
+
Per ruby.com/pricing on October 5, 2026: Starter $250 a month for 50 minutes, Professional $395 for 100, Business $720 for 200, Enterprise $1,725 for 500.
How much does Smith.ai cost?
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Per smith.ai/pricing on October 5, 2026: Starter $300 a month for 30 calls, Basic $810 for 90, Pro $2,100 for 300, with overage from $8.50 to $11.50 a call and add-ons such as appointment booking at $1.50 a call.
Will callers know they are talking to an AI?
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The voice is natural, and it says what it is if asked. Most callers care that they were answered, helped and booked.
Can I hear a Modern Mustard Seed AI receptionist?
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Yes. Call (406) 312-1223. Mr. Mustard, the studio's own voice agent, answers around the clock.
Sources and method
Modern Mustard Seed wrote this comparison and is one of the options in it. Every fact about another company was read from that company's own website on October 5, 2026. Prices change; check the source before you buy.