First AI Employee vs. Ruby: which receptionist is right for you?

Start with the call you are not thinking about: the one that rang while you were on a job, went unanswered, and quietly became your competitor's customer. You never got an invoice for it, which is exactly why it is the most expensive call you take. Both First AI Employee and Ruby exist to make sure that call gets answered. What separates them is what you pay, and whether you can predict the bill before it arrives.

The short version

Ruby answers with real people and bills by the minute, around $250 a month for 50 minutes, close to $5 a minute. That is the catch worth sitting with: the busier your month, the bigger your Ruby bill, and you only learn how big after the calls are done. First AI Employee is a flat $99 to $999, about $0.33 a minute on the entry plan (less on higher tiers), and it does not move when you get busy. If your calls genuinely need a human's judgment and the budget is there, Ruby is a capable premium service, and we will say so plainly. But if you want every call answered at a price that does not punish you for a good month, this is not a close call.

Cost: flat fee vs. by the minute

Ruby bills by receptionist minutes. Its entry plan is around $250 a month for 50 minutes, and higher tiers climb to $720 for 200 minutes and beyond. That works out to about $5 a minute, and the meter runs every time someone calls. First AI Employee is flat ($99 a month for 300 minutes, about $0.33 a minute), so a busy month doesn't spike the bill.

What the meter actually counts

Two details in Ruby's own Terms of Use (retrieved June 2026) shape that bill more than the headline rate does. Ruby states billable time 'includes hold time,' so the minutes a caller spends waiting on hold count against your plan even though no receptionist is talking. And every call is 'rounded up to the next 60-second mark,' so a call that runs a few seconds past a minute is billed as two. A flat plan sidesteps the question entirely: there is no meter to round and no hold clock to run.

There is also the part you can't see before you sign. Ruby's published FAQ (retrieved June 2026) says additional minutes bill at 'the overage rate associated with your plan' without listing a public per-minute figure, and it describes overage warnings inside the Ruby app at 85% and 100% of your minutes, so you have to log in to learn you're close. None of that exists on a flat plan, where quiet months cost the same as busy ones: nothing extra.

Coverage: around the clock vs. set hours

First AI Employee answers calls around the clock, including nights and weekends, instead of sending them to voicemail. Ruby's receptionists are real people working set hours, which is part of what the premium pays for. If a real share of your calls land after five, the AI closes that gap without overtime.

Texting and setup

First AI Employee bundles SMS into its flat plans (unlimited inbound plus a generous outbound allowance on Basic and Standard) and builds your agent for you, answering your calls in minutes after a short consultation, with no setup fee. Ruby includes onboarding too, though more complex setups can take a few business days.

Where Ruby is stronger

Credit where it's due: Ruby's receptionists are trained humans, and a person still reads an unusual or emotional call better than today's AI. If most of your calls are delicate and you can absorb the per-minute cost, that's a real reason to choose Ruby. For the routine majority of calls, First AI Employee covers them around the clock for a fraction of the price.

You do not have to take our word for any of this. Put it on your own line for seven days, free, and listen to it answer your calls. Start the free trial and decide with your own ears.