Trillet vs Retell vs Vapi for Agencies: 2026 Comparison
Retell is developer infrastructure with composed voice-agent pricing of $0.07 to $0.31 per minute, while Vapi charges a $0.05 platform fee before separate STT, LLM, TTS, and telephony costs. Neither provides a native white-label agency product. Trillet provides branded client workspaces, orchestration, compliance support, and a $0.12 AI-stack rate before telephony, so agencies should choose Retell or Vapi when they want to build the product layer and Trillet when they want that layer ready to resell.
This is an architecture decision before it is a price decision. The cheapest component stack can be the wrong operating model for an agency that does not want to build client access, billing, branding, and support workflows.
The Bottom Line
Trillet, Retell, and Vapi solve different parts of the voice AI problem.
- Trillet: a finished native white-label platform for agencies, with multi-tenant workspaces and a bundled platform, STT, LLM, and TTS rate.
- Retell: native, model-flexible voice infrastructure with transparent composed pricing and strong control for engineering teams.
- Vapi: API-first orchestration with broad provider choice, bring your own keys, and a $0.05 platform fee before model and telephony costs.
None is universally better. Retell and Vapi offer more component freedom. Trillet removes more of the agency product work.
How Do Trillet, Retell, and Vapi Differ?
Trillet sells the application and agency layer, while Retell and Vapi sell developer infrastructure. All three are native platforms in their respective categories, but only Trillet includes a first-party white-label reseller environment.
| Factor | Trillet | Retell | Vapi |
|---|---|---|---|
| Primary buyer | Agency or reseller | Developer or product team | Developer or product team |
| Architecture | Native voice AI platform | Native voice infrastructure | Native developer orchestration |
| Native white-label agency product | Yes | No | No |
| Branded client workspaces | Included | Build or add a wrapper | Build or add a wrapper |
| Model and provider control | Curated platform stack | Granular component choice | Broad component choice and BYO keys |
| Billing model | Subscription plus bundled AI usage | Composed pay as you go usage | Platform fee plus at-cost providers |
Calling Retell or Vapi a wrapper would be wrong. They are the infrastructure that third-party wrappers sit on top of. The agency question is whether to build or rent that missing reseller layer.
How Does Pricing Compare in 2026?
Trillet publishes a bundled AI-stack rate, Retell publishes a composed range, and Vapi publishes a platform fee plus provider costs. The numbers are not directly comparable until model and telephony assumptions match.
As of August 2026:
| Platform | Published pricing basis | Important boundary |
|---|---|---|
| Trillet Studio | $99/month, 100 shared AI minutes | Up to 3 workspaces |
| Trillet Agency | $299/month, 300 shared AI minutes | Unlimited workspaces |
| Trillet AI usage | $0.12/min after included minutes | Platform + STT + LLM + TTS; telephony excluded |
| Retell | $0.07-$0.31/min | Final cost depends on infrastructure, TTS, LLM, telephony, and add-ons |
| Vapi | $0.05/min platform fee | STT, LLM, TTS, and telephony are additional |
Trillet web calls and bring your own telephony add no Trillet telephony fee. Trillet-provided US telephony starts at $0.014 per connected minute, other countries vary, and the transferred portion costs $0.05 per minute after the AI usage charge stops.
Retell's current detailed pricing starts with $0.055 per minute for voice infrastructure, then adds the selected TTS, LLM, telephony, and optional features. Vapi passes STT, LLM, and TTS through at cost, or allows bring your own keys, on top of its $0.05 platform charge.
For matched web, bring your own telephony, US phone, and client-count calculations, use the voice AI pricing per minute guide. It names each assumption rather than treating three different billing models as one rate.
What Does an Agency Have to Build on Retell or Vapi?
An agency using Retell or Vapi directly must supply the client-facing product layer. The exact workload depends on what the agency already owns, so a fixed development-cost or delivery-time claim would be misleading.
The missing agency layer commonly includes:
- Branded client login and domain
- Client workspace isolation and permissions
- Usage markup and client billing
- Repeatable onboarding and configuration
- Cross-client reporting and support workflows
- Agency-level templates, contracts, and operational controls
An agency can build those capabilities or subscribe to a wrapper. A wrapper can be a rational choice because it gets the agency to market without building a SaaS product. It also introduces a second vendor relationship and subscription above the underlying Retell or Vapi usage.
Trillet includes the agency layer in Studio and Agency. Current tier limits and included minutes are listed on the Trillet white-label pricing page.
Where Does Retell Win?
Retell wins when a technical team wants transparent component pricing and granular model selection without committing to an agency platform. Its published calculator makes the infrastructure, voice, model, telephony, and optional-feature costs visible.
Retell also includes 20 concurrent calls on pay as you go and supports custom telephony with no Retell telephony charge. Teams can choose economical components for cost-sensitive use cases or premium components where voice quality and model capability matter more.
That flexibility is valuable when the voice agent itself is the product being engineered. The trade-off is that an agency reseller still needs branded client management and billing outside Retell.
Where Does Vapi Win?
Vapi wins when a development team wants broad provider choice, API-first control, and bring your own model keys. Its $0.05 platform fee is easy to understand once it is correctly treated as one layer of the call rather than the complete price.
Vapi's Build plan includes 10 concurrent lines, with additional lines priced at $10 per line per month. Its current pricing also lists HIPAA at $2,000 per month and zero data retention at $1,000 per month. Teams that need enterprise support, data residency, or contracted volume pricing move to its Scale offering.
For an agency, Vapi becomes a complete branded service only after the agency builds a product layer or adds a Vapi wrapper. That may still be the right answer for a team whose competitive advantage is its own software.
Where Does Trillet Win?
Trillet wins when the agency wants to sell voice AI rather than build the reseller platform around it. Studio and Agency include white-label branding, custom domains, isolated workspaces, client management, and one bundled AI-stack rate.
Verified agency capabilities include:
- Native GoHighLevel CRM integration
- Google Calendar and Cal.com booking, with Outlook through Cal.com
- Stripe billing
- Platform API keys, in-call APIs, and webhooks
- MCP connectivity for tools that expose an MCP server
- Multi-agent Crews, inbound agents, and compliant outbound workflows
- Voice, SMS, web chat, and email channels
HubSpot, Salesforce, and other systems should not be described as native connectors. Trillet can connect to them through MCP, APIs, webhooks, and its integration partners.
Trillet gives up some of the low-level provider choice that Retell and Vapi expose. Its value is a more opinionated product that an agency can brand and operate across many clients.
How Does Compliance Differ?
Compliance depends on both vendor controls and how the customer configures and operates the system. A badge or BAA does not make every call workflow compliant by itself.
Trillet includes HIPAA, SOC 2 Type II, ISO 27001, GDPR, TCPA, ACMA, and DNCR controls across its white-label offering. It can also co-deliver larger regulated deployments as the agency's compliance and infrastructure partner.
Retell publishes HIPAA and BAA support, personal-information redaction, recording controls, and custom data retention within its platform and enterprise options. Agencies should confirm the contract and configuration required for their exact workload.
Vapi lists HIPAA as a $2,000 monthly add-on. Its HIPAA documentation also requires a signed BAA and compliant STT, LLM, and TTS providers. Zero data retention is a separate $1,000 monthly add-on and cannot be enabled at the same time as HIPAA mode.
What to do: map every vendor that handles call data, then confirm contracts, retention, model providers, telephony, consent, and outreach rules for the client's jurisdiction.
Wrapper or Native Platform: Which Model Fits an Agency?
A wrapper fits an agency that wants Retell or Vapi's component choice without building the client portal and billing layer. A native agency platform fits a team that prefers one product owner and a bundled operating model.
Wrappers are not automatically bad economics. VoiceAIWrapper, for example, supports several underlying providers and applies no markup to their voice minutes. That lets an agency choose different cost and quality profiles by client.
The cost is organizational rather than mysterious: the agency pays the wrapper subscription and the selected provider bill, and support can cross company boundaries. The wrapper versus native platform guide examines that trade-off without pretending one architecture is right for every agency.
When Is Trillet Not the Right Fit?
Trillet is not the right fit when the business is building proprietary voice software and needs component-level control to be its differentiator. Retell or Vapi is usually the better foundation for a capable engineering team that wants to select providers, own low-level behavior, and build its own customer experience.
Trillet is also less compelling for a single experimental agent when the buyer already has engineering capacity and custom telephony. A low-cost Retell configuration or Vapi with economical provider keys can minimize raw infrastructure cost without paying for a full agency layer.
Choose Trillet when removing product-development and multi-client operations is worth more than component freedom. Choose Retell or Vapi when component freedom is the product.
Which Platform Should an Agency Choose?
The right choice follows from what the agency wants to own.
- Choose Trillet to resell a native white-label platform with workspaces, branding, orchestration, integrations, and compliance support already included.
- Choose Retell to engineer on transparent, model-flexible voice infrastructure with a detailed component calculator.
- Choose Vapi to build an API-first voice product with broad provider choice and bring your own keys.
- Choose a wrapper over Retell or Vapi when provider flexibility matters but building client portals and billing does not.
Agencies choosing the finished-platform route can evaluate Studio and Agency through Trillet White-Label. Teams choosing infrastructure should prototype the exact model and telephony configuration they expect to operate, not a marketing-rate placeholder.
Frequently Asked Questions
Can agencies white-label Retell or Vapi?
Not through a native first-party reseller product. An agency must build its own branded client layer or use a third-party wrapper such as VoiceAIWrapper or Vapify.
Is Trillet's $0.12 per minute price all-inclusive?
No. It includes platform, STT, LLM, and TTS but excludes telephony. Web and bring your own telephony add no Trillet telephony fee, US Trillet telephony starts at $0.014 per minute, and international rates vary.
Is Retell cheaper than Trillet?
It can be in a low-cost component configuration, especially with custom telephony. The comparison changes when an agency adds the client portal, branding, billing, compliance, and operational layer that Trillet includes.
Is Vapi really $0.05 per minute?
$0.05 is Vapi's platform fee. STT, LLM, TTS, telephony, and applicable add-ons must be added to calculate the actual call price.
Are Retell and Vapi wrappers?
No. Both are native developer infrastructure platforms. Third-party agency wrappers use their infrastructure and add branding, client workspaces, and billing.
Updated for August 2026: refocused the comparison on vendor and architecture selection, corrected Trillet's telephony boundary, updated Retell and Vapi component pricing, removed unsupported time and cost claims, and verified Trillet's integration wording.
