The short answer
Retell is the faster route to production: managed pipeline, bundled telephony, $0.07 to $0.31 per minute. Vapi is the lower meter, $0.05 per minute plus provider costs, for teams wanting per-stage control. Pick Retell for speed, Vapi for control, or a done-for-you agent if you want the appointments.
Key takeaways
- Retell bundles the pipeline and telephony; Vapi passes every provider bill through to you.
- Retell's default build prices at $0.11/min inside its published $0.07 to $0.31 band.
- Vapi's $0.05/min is the platform fee only; HIPAA adds $2,000/mo.
- Platform fees are the small line; engineering time is the expensive one.
- If the goal is booked appointments, a trained done-for-you agent beats either platform.
Retell and Vapi both put AI voice agents on the phone, and both charge by the minute. The resemblance ends there. Retell sells a managed pipeline you configure from a dashboard. Vapi sells an orchestration layer where you pick the speech-to-text engine, the model, the voice, and the telephony, and own whatever you assemble.
Pick Retell if you want a production agent live this week and can live with its defaults. Pick Vapi if your engineers want per-stage control and will keep owning the pipeline after launch. Every number behind that call comes from the two vendors' own pricing pages, linked at each claim.
What each platform is#
Retell is a finished platform. Agents are built in its dashboard or through its API, with the model, voice, and telephony drawn from an integrated catalog, and Retell operates the whole pipeline on its own infrastructure. Telephony is bundled: US calling through Twilio at $0.015 per minute, SIP trunking at no added charge, phone numbers at $2 a month.
Vapi is the parts counter. The $0.05 per minute on Vapi's pricing page buys the plumbing between your providers: your transcription account, your LLM key, your voice, your carrier. Model costs pass through at cost, or $0 if you bring your own API keys, and transport is billed by the provider, not Vapi. You can swap any stage. You also have to.
What a minute really costs#
The headline rates measure different things, and comparing them directly is the most common mistake in this evaluation.
Retell publishes a pay-as-you-go band of $0.07 to $0.31 per minute on its pricing page. The spread is mostly the model: GPT 5 nano runs $0.003 per minute, while GPT Realtime runs $0.345. The page's own default build, $0.055 voice infrastructure plus $0.04 LLM plus $0.015 TTS, totals $0.11 per minute, which puts 10,000 conversational minutes near $1,100 on a single invoice. New accounts get $10 in credits and 20 concurrent calls included; extra concurrency is $8 per line per month. Usage add-ons stack on top: knowledge base at $0.005 per minute, branded caller ID at $0.10 per outbound call, PII removal at $0.01 per minute.
Vapi's $0.05 is the platform meter only. Providers bill on top, so transcription, model, voice, and telephony each arrive as their own line item from their own vendor. Ten thousand minutes costs $500 of platform fees plus whatever those four providers charge. Wire components at rates similar to Retell's published component list and the total converges on Retell's; the savings live in choosing cheaper components and doing the integration work yourself. Vapi includes 10 concurrent lines, then charges $10 per line per month, and lists two add-ons regulated teams should price in up front: HIPAA at $2,000 a month and zero data retention at $1,000 a month. Retell's pricing page publishes no compliance add-on line.
Default build against default build, the meters land close. Vapi gets cheaper when an engineer tunes it to be cheaper. For the deep dives, see our breakdowns of Vapi pricing and Retell AI pricing.
The production gap#
Both platforms demo well. The difference shows up at call volume.
A voice pipeline has the same stages everywhere: transcribe the caller, generate the reply, speak it back. Each stage adds its own delay, and each handoff between vendors adds a little more. Retell pre-integrates the chain and tunes it as one system, so the party responsible for a slow agent is Retell. On Vapi the seams belong to you. When the agent starts feeling sluggish, your team isolates which of the four providers degraded and fixes or replaces it.
That arrangement is exactly what some teams want. Swapping in a new voice model the week it ships, routing around a provider outage, tuning pause lengths per campaign: all of it is possible because every stage is exposed. The same exposure makes Vapi the wrong purchase for a team without an engineer assigned to it. A voice agent at 10,000 calls a day is infrastructure, and infrastructure needs an owner.
Side by side#
Sourced from Retell's and Vapi's pricing pages.
| Retell AI | Vapi | |
|---|---|---|
| What you buy | Managed voice pipeline | Orchestration layer, bring your own providers |
| Platform meter | $0.07 to $0.31/min, pay as you go | $0.05/min, providers billed separately |
| Published default build | $0.11/min estimator total | None; the total depends on your providers |
| Telephony | Twilio US at $0.015/min, SIP trunking included | Charged by your carrier |
| Concurrency | 20 included, then $8 per line/mo | 10 included, then $10 per line/mo |
| Free start | $10 in credits | 60+ included minutes |
| Compliance add-ons | None listed on the pricing page | HIPAA $2,000/mo; zero data retention $1,000/mo |
| Enterprise | Custom pricing, concurrency from 50+ | Fixed platform fee plus committed volume |
| Best fit | Teams who want the agent running this week | Engineering teams who want per-stage control |
Who should pick which#
Choose Vapi if someone on the team will still own this pipeline next quarter. The per-stage control is the product: swap models, tune latency, negotiate provider rates, build a voice product of your own on top. The $0.05 meter rewards that work.
Choose Retell if the goal is a working agent, fast, with one vendor to call when something breaks. The dashboard builder, integrated catalog, bundled telephony, and single invoice are what the higher band pays for.
The mistake to avoid is shopping this as a pricing question. Platform fees are the small line in a voice program. The expensive line is the engineering time to design, test, and maintain the agent, and if nobody on your team has those hours, the managed option is the honest one.
Skip the build
Rezora IO puts a trained agent on your phone for a live demo call before you buy anything. Judge the conversation first, then decide whether a pipeline project is even necessary.
Book a demoThe question behind the question#
Most teams running this comparison do not want a voice platform. They want answered calls, qualified leads, and booked appointments, and a platform is a means to those ends that you then operate yourself: prompt design, flow testing, monitoring, provider management.
When operating the stack is the plan, the profiles above are the right frame. When the outcome is the plan, there is a shorter route. Rezora IO occupies that third slot: an autonomous voice agent that arrives already trained. Instead of prompting a general-purpose model, its voice models were trained in-house on real sales conversations, through supervised fine-tuning and then preference optimization, so objection handling and booking behavior come from training data instead of a prompt you maintain. There is nothing to assemble: upload a list or wire in HubSpot, GoHighLevel, or Zapier, and calls start in minutes. Pricing is public: $289 per month plus $0.20 per conversational minute. The plan runs month to month, and enterprise plans extend the training to your own recorded calls, any industry. Today the deepest training corpora sit in real estate and home services; the platform itself is general purpose.
For the field beyond these two vendors, the Vapi alternatives guide compares eight options by build effort and cost, and our AI cold calling software roundup covers outbound-specific tools.
Common questions#
Is Retell cheaper than Vapi?#
Default against default, they land close. Retell's own estimator prices its standard build at $0.11 per minute, inside the published $0.07 to $0.31 band. Vapi charges $0.05 per minute plus whatever your speech, model, voice, and telephony providers bill. Vapi wins on price only when someone tunes the component choices; Retell wins on invoice simplicity.
Do you need developers to use Retell or Vapi?#
Vapi, yes. It is API-first and assumes your team wires the providers, handles failures, and maintains the integration. Retell can be driven from its dashboard with far less code, though engineering help still matters once you connect CRMs, webhooks, and custom logic. Neither platform removes the need for someone technical to own the deployment.
Does Vapi include HIPAA compliance?#
Not in the base meter. Vapi's pricing page lists HIPAA compliance as a $2,000 monthly add-on, with zero data retention at another $1,000 a month. Retell's pricing page publishes no compliance add-on line; if your calls touch regulated data, confirm the specifics with its sales team before you build.
Can Retell or Vapi make outbound sales calls?#
Both platforms support outbound dialing. The harder question is what the agent says once someone answers: outbound performance depends on training, prompts, list quality, and compliance with calling rules, and on either platform those sit with you. Teams buying outbound outcomes rather than dial tone usually end up comparing done-for-you agents instead.
What are the alternatives to Retell and Vapi?#
Bland, Synthflow, and a half-dozen others compete in the same category, and the done-for-you layer replaces the category for teams that want outcomes. The Vapi alternatives guide compares eight options by build effort, cost, and control, and the Retell AI alternatives guide prices seven of them against Retell's own meter.
