Martí Blanes
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Voice Agent Cost Calculator: Retell vs ElevenLabs vs Kallflow

Enter your monthly call volume, pick your stack, and see exactly what each platform costs, and where the breakeven flips.

retellelevenlabskallflowpricingvoice-agents

Voice Agent Cost Calculator

Your setup
Monthly minutes
1,000
100typical dental ≈ 2,00010k
Retell stack

GPT-4o · ElevenLabs Flash · platform Twilio

ElevenLabs Agents tier

$0.12 bundled + LLM $0.015 + SIP $0.007

Kallflow plan

€49/mo · 3 agents · 5 concurrent calls

Monthly cost at 1,000 min

RetellTypical
$200/mo
ElevenLabs AgentsPremium
$145/mo
KallflowStarterCheapest
$116/mo
Kallflow breakeven

Kallflow Starter becomes cheaper than Retell Typical at:

387min / month

≈ 6h of calls · 97 calls at 4 min avg

Past breakeven. Kallflow saves $84/mo at this volume

Inside the community

You have your cost per minute. Here's how to cut it, price it, and protect it.

  • Dial audit spreadsheet: find your real cost/min across all 5 dials in 10 minutes
  • Telnyx SIP config: 4 fields to paste, cuts $0.008/min off every call immediately
  • Client pricing formula: enter their monthly minutes, get your retainer floor with margin
  • Kallflow switch pitch: 3 sentences, insert your breakeven figure, ready to send
  • Retainer scope guard: the NOT INCLUDED clauses that kill scope creep before it starts
Get the 5 templates: audit, cut, price, pitch, protect. Free trial inside.
12-month projection
RetellTypical
$2.4k
ElevenLabs AgentsPremium
$1.7k
KallflowStarter
$1.4k

Assumes flat monthly volume of 1,000 min/mo.

The Five Dials: reference rates
Platform: Retell
$0.07/min
LLM: GPT-4o mini
$0.003/min
LLM: GPT-4o full
$0.015/min
TTS: ElevenLabs Flash
$0.045/min
TTS: Multilingual v2
~$0.12/min
STT: Deepgram Nova-3
$0.0077/min
Telephony: own SIP
$0.007/min
Telephony: Twilio relay
$0.015/min

The kitchen, not the door

Got your cost per minute? Now cut it, price it, and protect it.

Five copy-paste templates inside: dial audit spreadsheet, Telnyx SIP config, client pricing formula, Kallflow switch pitch, and retainer scope guard. Free trial.

Get the 5 implementation templates