Last verified: October 12, 2026. This pricing guide uses current vendor documentation and clearly labeled cost scenarios. It is not a hands-on product benchmark.
Quick answer: Retell AI lists its pay-as-you-go voice agents at $0.07–$0.31/minute. A business with 500 connected call minutes could therefore model $35–$155 in voice-minute charges, before any applicable extra features, phone service, setup or maintenance. Vapi advertises a $0.05/minute hosting fee plus voice, transcription, AI model and transport charges. The headline rates do not describe identical bundles.
This guide explains the actual cost drivers, compares the two platforms with Synthflow’s current enterprise offering, and shows how to estimate your own AI receptionist spend before buying.
Retell AI pricing 2026: 100, 500 and 1,000 minutes
Retell’s official pay-as-you-go offering currently advertises $10 in starting credits and a voice-agent range of $0.07–$0.31/minute. There is no mandatory fixed platform subscription advertised for this tier, but the components and optional features you choose affect the invoice.
| Monthly minutes | $0.07/min | $0.15/min* | $0.31/min |
|---|---|---|---|
| 100 | $7 | $15 | $31 |
| 500 | $35 | $75 | $155 |
| 1,000 | $70 | $150 | $310 |
*$0.15/minute is an illustrative configuration displayed in Retell’s calculator during research, not a guaranteed default, actual average or fixed price. All amounts are calculated examples, not quotations. Check the current official Retell calculator for the voice, model, country and add-ons you choose.
What affects the real Retell AI bill?
The public Retell pricing calculator separates voice infrastructure, text-to-speech, AI language model, telephony and add-ons. Before budgeting, investigate each line:
- Voice infrastructure: Retell’s detailed price list currently shows $0.055/min for its voice infrastructure.
- Text-to-speech: Retell platform voices are listed at $0.015/min, while certain external voices cost more.
- AI model: Different language models can carry different minute rates; choosing the most expensive model does not guarantee better appointment handling.
- Phone numbers and calls: A Retell phone number is currently listed at $2/month; charges for telephony can depend on country and configuration.
- Optional extras: Advanced denoising, knowledge base usage, privacy redaction and quality analysis can have additional charges.
- Implementation: Flow design, CRM and calendar integrations, escalation rules, testing, maintenance and reporting are business-workflow costs beyond the bare AI minute rate.
Rule for buyers: Calculate one fully configured call on each platform and multiply by your connected call minutes. Do not treat a promotional or infrastructure-only price as the final bill.
Retell AI vs Vapi vs Synthflow: 2026 price comparison
| Provider | Public pricing model | Worth evaluating if… | Watch out for |
|---|---|---|---|
| Retell AI | $0.07–$0.31/min voice agent | You want usage-based voice-agent pricing | Your model, voice and extras change the total |
| Vapi | $0.05/min hosting + model, voice, transcription and transport | You want detailed component control | $0.05 is not the all-in minute cost |
| Synthflow | Enterprise contracts from $30,000/year | You are planning an enterprise deployment | A different buying model from self-serve pay-as-you-go |
These are published offers, not equal-feature quotes or performance rankings. In particular, Synthflow’s current public page specifies enterprise contracts starting at $30,000 annually; some earlier comparison articles quote a different self-serve model. For new 2026 buyers, rely on the current direct quote rather than old screenshots.
Primary sources: Retell pricing, Vapi pricing, Synthflow pricing.
Vapi pricing: why the $0.05/minute headline is incomplete
Vapi’s hosting fee is only one layer of the system. Depending on the chosen transcriber, AI model, text-to-speech provider, telephony and support package, total costs change. One example in Vapi’s public 1,000-minute calculator showed an estimated $82–$129/month with a specified provider mix and no added success package. That figure is an illustration, not Vapi’s universal price.
The Vapi billing documentation explains that usage charges continue if an optional support package is added. Compare quotes only after specifying the same call flow, language, model capabilities, phone geography and human transfer logic.
Realistic example: 100 calls per month
Imagine a service business getting 100 calls at an average connected duration of four minutes. Its voice agent would handle 400 minutes/month. Using Retell’s current advertised minute range, the modeled voice component costs $28–$124; a $0.15/minute example would cost $60. Phone service, configuration, integration and applicable extras still need to be added.
Now check the workload: Are callers asking standard opening-hour questions, booking appointments, requesting quotes, reporting urgent issues or making complicated complaints? The call mix matters as much as total minutes. High-risk or sensitive requests should have a reliable route to a human.
Before subscribing, measure the number of connected calls, average call duration, missed calls, required transfers and actual bookings. A believable budget is grounded in your own phone records, not an assumed 90% conversion rate.
Eight AI receptionist tests before you buy
- Business information: Is the agent restricted to the approved business facts and policies?
- Calendar accuracy: Does it verify availability and confirm date, time and timezone?
- Conversation interruptions: Can customers correct details naturally?
- Human transfer: Can customers ask for a person at any time?
- Unanswered transfer: Is there a sensible callback or message-taking fallback?
- Lead records: Does it preserve accurate information without duplicate CRM entries?
- Privacy: Are disclosures, consent, recording and retention aligned with applicable rules?
- Outages: Is there a fallback when phones, calendars or model providers fail?
Use identical sample calls for each vendor: easy FAQ, overlapping requests, different accents, noisy audio, a changed booking date and a caller insisting on a real employee. Do not equate a clean demo with reliable production behavior.
Should you hire someone to set up your AI receptionist?
Self-serve setup may be reasonable for basic FAQ or simple appointment routing. Professional assistance becomes more useful when there are CRM pipelines, multiple business locations, calendar permissions, customer data rules, reporting requirements or complicated escalation procedures.
Before engaging a builder, request a written scope covering the call flow, integrations, knowledge base, test cases, account ownership, documentation, monitoring and what is excluded. Separate one-time setup from ongoing voice-minute, provider and maintenance charges.
HEREFLOWAI • AUTOMATION PLANNING
Map your phone workflow before choosing a platform
The $49 HereFlowAI AI Automation Audit reviews one workflow, identifies three priority automation opportunities and delivers a process blueprint, suggested tool stack and human-approval checkpoints. This is a planning service, not a full receptionist build for $49.
Calculate your own AI receptionist budget
Estimated monthly cost = (number of connected calls × average minutes × configured complete per-minute rate) + recurring fixed charges + applicable extras.
For example, 150 calls × 3 minutes = 450 talk minutes. At an illustrative complete rate of $0.15/min, that is $67.50 for voice minutes, excluding other applicable charges. Build low, expected and high-volume scenarios to avoid surprises.
Phone intake should also lead somewhere useful. See our Small Business Lead Follow-Up Automation guide and CRM Lead Follow-Up Automation guide for the next steps after a call.
Still choosing a phone-answering model? Compare AI receptionists vs live human answering services, then review seven small-business answering plans for turnkey alternatives. This Retell guide is focused on the underlying usage costs of a configurable voice agent.
Frequently asked questions
Is Retell AI free?
Retell advertises starter credits, but calls beyond the credit are billed at the applicable usage rate. Check the current offer and terms.
Does Retell AI charge a mandatory monthly platform fee?
Its published pay-as-you-go voice tier does not advertise one, but phone numbers and optional features can create additional charges. Enterprise contracts have custom terms.
How much do 500 Retell minutes cost?
Using the published range, the modeled voice-minute component is $35–$155. A $0.15/min example equals $75. The final bill depends on the actual configuration.
Is Vapi cheaper than Retell AI?
Not necessarily. Vapi’s basic hosting fee is not equivalent to the full cost of a configured voice agent. Compare complete quotes using the same minutes and components.
Can an AI receptionist replace all front-desk work?
Not safely in every business. Routine FAQ, intake and bookings can be promising starting points; sensitive, unusual and consequential decisions often require human handling.
Bottom line
Retell is a strong candidate to evaluate for usage-based AI receptionists, Vapi for teams wanting control of component costs, and Synthflow for organizations considering enterprise voice AI. Start with real call data, a working escalation plan and a fully configured price estimate rather than selecting purely on the advertised minimum.
Still designing the workflow? Explore HereFlowAI’s scoped automation audit.
Sources and methodology
Verified against official pages on October 12, 2026: Retell AI pricing, Vapi pricing, Vapi billing guide, Synthflow pricing. Modeled costs are transparent arithmetic illustrations, not provider quotes. This article does not claim hands-on performance testing, and current provider URLs are direct, not account-specific affiliate tracking links. Terms may change.
