Ruby vs Smith.ai: Which Is Cheaper?

Ruby is cheaper than Smith.ai when your average call is under about two minutes. Smith.ai is cheaper when it runs longer. That is the whole answer, and it falls out of the fact that the two services bill on different units: Ruby charges for receptionist minutes, Smith.ai charges per call. At Ruby's published rates a minute costs $3.45 to $5.00, and at Smith.ai's a call costs $7.00 to $11.50, so the two lines cross at roughly two minutes of talk time no matter which tier you compare. Most small business calls run three to five minutes, which is why Smith.ai usually wins on paper and why neither wins against a flat plan once volume climbs.

Prices below were read from each vendor's own pricing page in August 2026. Both companies change rates, so confirm at the source before you sign anything.

Ruby and Smith.ai are the two names that come up most often when a US business goes shopping for a live virtual receptionist, and they are genuinely the strongest human services in the category. They are also priced in units that cannot be compared side by side without doing arithmetic, which is presumably not an accident. This walks through the published numbers, works out where the crossover actually sits, and is honest about the cases where the answer is neither of them.

How much does Ruby answering service cost?

Ruby publishes four virtual receptionist plans, priced by receptionist minutes: $250 a month for 50 minutes, $395 for 100, $720 for 200 and $1,725 for 500. Ruby states plainly that there are no additional or hidden fees for activation, onboarding, setup or customization, which is a genuinely good commercial term and rarer in this category than it should be. Above 500 minutes you are directed to sales.

The number Ruby does not publish is the overage rate. If you run past your minute allowance, the pricing page does not tell you what the next minute costs. That is the single biggest unknown in a Ruby quote and it is worth pinning down in writing before you commit, because minute plans are the ones most likely to be exceeded in a good month.

Divide each plan by its minutes and the effective rate is $5.00, $3.95, $3.60 and $3.45 a minute as you move up the tiers. That is the most expensive published per-minute rate of any answering service we track, and it buys you a trained human being in the United States answering your phone, which is a real product and not a rip-off. It is simply a different thing from software.

How much does Smith.ai cost per month?

Smith.ai prices by call, not by minute. The published plans are $300 a month for 30 calls, $810 for 90 calls and $2,100 for 300 calls, with an enterprise tier by quote. Overage is published, which is a point in Smith.ai's favor: $11.50, $10.50 and $8.50 per extra call as you move up the tiers.

The complication is the add-on menu. A long list of things that other services fold into the base price are billed per event at Smith.ai, and the ones that catch people out are appointment booking at $1.50 per booking, conflict checks at $0.50, call recording with transcription at $0.25, a Spanish language line at $1.00 per call, complex call routing at $1.50 and extended intake at $1.50. None of these are large on their own. Together, on a firm that books most of its callers and runs a Spanish line, they can add two to three dollars to every call.

So the honest effective figure at Smith.ai is $7.00 to $11.50 for the call itself, plus whatever your add-on profile costs. If you are booking appointments on most calls, model $8.50 to $13.00.

Ruby vs Smith.ai: which is cheaper?

Because one bills minutes and the other bills calls, the comparison only resolves once you fix your average call length. Set Ruby's cost at its per-minute rate times your call length, set Smith.ai's at its per-call rate, and find where they meet.

The crossover lands within a few seconds of two minutes at every tier, which is a tidier result than you would expect from two companies pricing independently. It gives you a rule you can apply in one step: if your calls average under two minutes, Ruby costs less. If they average over two minutes, Smith.ai costs less. Add appointment booking to the Smith.ai side and the crossover moves out to roughly 2.3 minutes at the entry tier, which still sits well under a typical call.

The catch is that most small business calls are not two minutes. A new patient asking about insurance, a homeowner describing a leak, a prospective client explaining what happened: those run three to six minutes once the receptionist has taken details. At four minutes a call, Ruby's entry tier is charging $20 for a call Smith.ai would handle for $10.

What does 100 calls a month actually cost?

Per-unit rates understate the problem, because you do not buy minutes and calls one at a time. You buy blocks, and the block sizes do not line up with each other. Here is the same volume, 100 answered calls a month, priced at three different call lengths.

Two things show up here that the per-minute rates hide. The first is Ruby's block problem: at 300 minutes you are over the 200 minute plan and the only published option above it is 500 minutes at $1,725, so you either pay for 200 minutes you will not use or you pay an overage rate Ruby does not publish. The second is that Smith.ai's per-call billing is indifferent to call length, which is exactly why it wins on longer calls and why it is the better fit for intake-heavy work.

The third column is there for scale rather than as a trick. A flat AI plan is a different product with different limits, and the comparison is only fair for the portion of your calls that are routine. It is also the reason both of these services now face a price question they did not face five years ago.

Which is better for a law firm?

Both companies sell hard into legal, and this is where the add-on menu decides it. Smith.ai bills conflict checks at $0.50 and extended intake at $1.50, and it is built around structured intake with a defined set of questions per matter type. Ruby is built around the receptionist relationship: message taking, warm transfers, and a consistent voice answering your line. If your intake script is long and standardized, Smith.ai's model fits it and the per-call price stops punishing you for a thorough call. If your calls are short and you mainly need a professional human picking up, Ruby's per-minute plan will cost less.

Either way, get the overage terms in writing. A personal injury firm running a campaign can double its call volume in a fortnight, and that is precisely the month where an unpublished per-minute rate becomes an unpleasant surprise. Our page on legal answering service options covers what to require in an intake script, and the deeper vendor breakdowns sit on the Ruby alternative and Smith.ai alternative pages.

Do Ruby or Smith.ai use AI?

Both have added AI features, and both remain fundamentally human answering services. That is the product you are buying and it is the reason the price sits where it does. A trained receptionist in the United States costs real money to employ, and $3.45 to $5.00 a minute is roughly what that works out to once you include the company running it. Anyone telling you these services are overpriced is comparing them to software rather than to staff.

The genuine question is not whether humans are better. It is what share of your calls actually need one. For most businesses the honest answer is a minority: the bulk of inbound calls are hours, pricing, availability and rescheduling, and those end best with something written to the calendar rather than a message emailed to your front desk. Work out your true cost per booked appointment rather than your cost per call, and put that figure into your monthly operating numbers where it belongs alongside every other line in your monthly financial statements. It is usually the number that changes the decision.

When neither one is the right answer

Three situations, and they are common.

If your call volume is under about thirty calls a month, both services are expensive per call because you are paying a monthly minimum against very little use. A pay as you go option or a flat entry plan will beat both.

If your volume moves with your marketing, a minute meter or a per-call meter means your phone bill rises exactly when your advertising works. That is the wrong incentive to have running underneath your business, and it is the most common reason people leave both services.

If what you actually need is the appointment on the calendar rather than the message in your inbox, check carefully what each service does at the end of the call. Ruby's core service is message taking and transfers. Smith.ai books, at $1.50 a booking. An AI answering service books during the call at no per-event charge, and the tradeoff is that it will hand off the genuinely unusual caller instead of handling it. Which of those matters more is a question about your call mix, and it is answered by listening to a week of your own recordings rather than by reading anybody's comparison page, including this one.

The short version

Ruby wins under two minutes a call, Smith.ai wins over it, and the gap widens fast as calls get longer. Ruby's published terms are cleaner, with no setup or activation fees, but it hides the overage rate. Smith.ai publishes its overage but charges separately for booking, conflict checks, transcription and Spanish. At 100 calls a month you are looking at $720 to $1,725 with Ruby and about $915 with Smith.ai, against $199 for a flat AI plan covering the routine share of that traffic. Every published price in the category, human and AI, sits in one table in our best AI answering service comparison.