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Per minute, per call or flat rate: which is cheaper?
Picking the wrong billing model costs more than picking the wrong vendor. Every model has a crossover point where it stops being the cheap option, and those points are calculable from published prices. Here they are, with the working shown, so you can put your own volume against them.
Short answer: per minute wins below your vendor's crossover, which sits between 500 and 1,000 minutes a month depending on who you pick. Flat rate wins above it: NextPhone is $199 for unlimited calls. Per call wins once your average call passes about 5.7 minutes. Per customer wins when calls run long and the same people call back.
When does a flat rate beat a per-minute plan?
NextPhone Pro is $199 a month for unlimited calls with no overage line at all. That gives us a fixed yardstick. For every per-minute vendor there is a minute count where their cheapest possible bill reaches $199, and past that point you are paying more for less. Each threshold below comes from the vendor's own plan ladder and overage rate.
| Vendor | Crossover against $199 flat | The working |
|---|---|---|
| Dialzara | 500 minutes | Business Plus is $199 for 500 minutes, the same price as flat rate but capped. Minute 501 costs $0.40 on top. |
| Answrr | 750 minutes | Growth is $199 for 750 minutes (12.5 hours), matching flat rate exactly until the allowance runs out at $0.22 a minute. |
| Rosie | 1,000 minutes | Scale is $149 for 1,000 minutes, cheaper than flat rate. The next tier up is $299, which is not. |
| My AI Front Desk | 600 minutes | $99 covers 200 voice minutes, then credits work out near $0.25 a minute: $99 + 400 x $0.25 = $199. |
| Nextiva XBert | 201 conversations | $99 covers 100 interactions, then $0.99 each: at 201 conversations you pay $198.99, one cent under flat rate. |
Read the Rosie row carefully, because it is the exception that proves the point. Rosie Scale is $149 for 1,000 minutes, which is $0.15 a minute and cheaper than flat rate the whole way. Flat rate only wins at Rosie because the next tier jumps to $299. Crossovers are set by where a vendor puts its steps, not by the model in the abstract.
When does per-call billing beat per-minute?
Divide the price of one extra call by the price of one extra minute. That gives the call length at which the two models cost the same. Below it, per minute is cheaper. Above it, per call is. Smith.ai is the clearest per-call vendor in this market, so we priced its marginal call against the marginal minute at three human competitors.
| Per call | Per minute | Crossover |
|---|---|---|
| Smith.ai Starter, extra call $11.50 | AnswerConnect Growth, extra minute $1.85 | 6.2 minutes |
| Smith.ai Basic, extra call $10.50 | AnswerConnect Growth, extra minute $1.85 | 5.7 minutes |
| Smith.ai Pro, extra call $8.50 | AnswerConnect Growth, extra minute $1.85 | 4.6 minutes |
| Smith.ai Basic, extra call $10.50 | PATLive Standard, extra minute $2.20 | 4.8 minutes |
| Smith.ai Pro, extra call $8.50 | PATLive Pro, extra minute $2.00 | 4.3 minutes |
| Smith.ai Basic, extra call $10.50 | Ruby Receptionist 200, plan rate $3.60 | 2.9 minutes |
The spread matters more than the average. Against AnswerConnect, the cheapest per-minute human service, per-call billing needs calls of 4.6 to 6.2 minutes to win. Against Ruby, whose plan rate is $3.60 a minute, the crossover drops to 2.9 minutes, which every real conversation clears. So per-call versus per-minute is really a question about which per-minute vendor you were going to use, and we work through those rates in answering service pricing.
One warning specific to Smith.ai: the extra call always costs more than the calls inside your plan. Basic includes 90 calls at $9.00 each, and call 91 costs $10.50. Forecast high, not low.
When does paying per customer win?
Goodcall charges for unique callers instead of time: $79 for 100 unique customers with unlimited minutes, then $0.50 per additional caller. At 300 unique callers the cheapest combination is Growth at $129 plus 50 extra callers at $0.50, so $154 a month. That figure does not move if every call runs fifteen minutes.
| Vendor | 300 callers at 1 minute each | 300 callers at 4 minutes each |
|---|---|---|
| Goodcall (per customer) | $154 Growth $129 + 50 x $0.50 | $154 Identical. Minutes are not billed. |
| Answrr (per minute) | $99 300 minutes on Starter | $298 1,200 minutes: $199 + 450 x $0.22 |
| Dialzara (per minute) | $135 300 minutes: $99 + 80 x $0.45 | $419 1,200 minutes: $349 + 200 x $0.35 |
| NextPhone (flat rate) | $199 Unlimited | $199 Unlimited |
The crossover is call length, and it is lower than people expect. At 300 unique callers, Answrr only beats Goodcall while the average call stays under 1.7 minutes. Above that, per-customer billing wins and keeps winning, because Goodcall's price is flat in the dimension that grows. Two caveats before you switch: Goodcall's price is quoted per agent, and its cheapest tier keeps call records for seven days.
What about per-conversation billing?
Nextiva bills per conversation rather than per minute or per call, at $99 for 100 interactions then $0.99 each. The definition is unusually fair: a conversation only counts when a call runs 30 seconds or longer, or a text thread receives three or more AI responses. Wrong numbers, hangups and one-line confirmations cost you nothing, which is the opposite of Ruby's rounding up to the next full minute.
The trap is volume. At 201 conversations you pay $198.99, a cent under NextPhone's flat rate. Two conversations later flat rate is cheaper and stays cheaper forever. At 300 conversations Nextiva costs $297, which is $98 more than unlimited answering. Fair unit, punishing slope.
What does an unpredictable month cost on each model?
This is the argument flat rate actually wins, and it is not about the average month. Take a business that normally runs 300 minutes and has one bad month at 1,200 minutes: a burst of press, a storm, a competitor closing. On Dialzara the bill moves from $135 to $419. On Answrr it moves from $99 to $298. On NextPhone it stays at $199.
That difference of $220 in a single month is what you are buying when you pay more for flat rate up front. If your call volume is seasonal, tied to weather, or driven by marketing you cannot time, price the spike rather than the average. If your volume is genuinely steady, the flat-rate premium is money spent on insurance you will not claim.
Which model fits which business?
| Model | Fits | Breaks when |
|---|---|---|
| Per minute | Steady volume, short calls, below your vendor's crossover in the table above | Volume spikes, or the vendor does not publish an overage rate |
| Flat rate | High or unforecastable volume, from $199 a month | You are quiet: at 300 minutes you pay $100 more than Answrr |
| Per call | Long calls, high value per caller, over 5.7 minutes average | Lots of short calls, and overage per call runs above the in-plan rate |
| Per customer | Long conversations with a predictable set of callers | A surge of new callers: $0.50 each adds up, and pricing is per agent |
| Per conversation | Many short or abandoned calls that never reach 30 seconds | Past 201 conversations a month, where flat rate takes over |
One vendor per model, if you already know your volume
Under 500 minutes and steady: Answrr Starter at $99 for 300 minutes (5 hours), every feature on every tier. Over it, or unforecastable: NextPhone Pro at $199 for unlimited calls. Long calls with repeat callers: Goodcall at $79 for 100 unique customers.
Check Answrr pricing Check NextPhone pricing Check Goodcall pricing
Some links here are affiliate links. NextPhone and Goodcall pay us nothing and still won two of the three cases above.
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Frequently asked questions
Is a flat rate cheaper than per-minute billing?
Only above your crossover, and every vendor has a different one. Against NextPhone at $199 a month for unlimited calls, Dialzara stops being cheaper at 500 minutes, Answrr at 750 minutes, Rosie at 1000 minutes and My AI Front Desk at 600 minutes. Under those numbers a per-minute plan wins. Over them you are paying overage for nothing.
When is per-call billing cheaper than per-minute?
When calls run long. Smith.ai charges $10.50 for an extra call on its Basic plan while AnswerConnect charges $1.85 for an extra minute, so per-call wins once your average call passes 5.7 minutes. Against Ruby's plan rate of $3.60 a minute the crossover falls to 2.9 minutes, which almost any real conversation clears.
What is per-customer billing and when does it win?
Goodcall charges for unique callers rather than time: $79 for 100 unique customers with unlimited minutes, then $0.50 per extra caller. At 300 unique callers a month it costs $154 whether each call lasts one minute or fifteen. A per-minute plan only beats that if your average call is under about 1.7 minutes. Note that Goodcall prices per agent.
Which billing model should a small business choose?
Steady volume and short calls: per minute. Long calls or a fixed set of regular callers: per customer. High or unpredictable volume: flat rate, because it is the only model where a busy month costs the same as a quiet one. High-value calls where one booking pays for the year: per call, since the price stops mattering.
Prices come from vendor pricing pages and change without notice. Confirm the current price with the vendor before buying.