Trillet vs Retell vs Vapi for Agencies: 2026 Comparison
For agencies, Trillet is the faster route to a branded service with predictable delivery: Studio is $99 per month for 1,000 minutes and three workspaces, while Agency is $299 per month for 3,000 minutes and unlimited workspaces. Retell's $0.07 to $0.31 per minute infrastructure and Vapi's $29 Core plan plus component costs give technical teams more provider control, but neither publishes a turnkey agency portal with client workspaces and rebilling. Choose Trillet when margin, client ownership, and one support path matter more than building the product layer yourself.
That is the commercial decision. The technology matters because it determines how many systems the agency must operate, who owns the client experience, and who answers when a production call fails.
The Bottom Line
Trillet is the agency product, while Retell and Vapi are developer foundations. The right choice depends on whether the agency wants to sell and support a finished service or build the software around the voice engine.
- Choose Trillet when speed to revenue, branded client delivery, margin controls, and one core support relationship are the priorities.
- Choose Retell when an engineering team wants granular component pricing and model choice, and is prepared to build the agency layer.
- Choose Vapi when API control, provider choice, and bring your own keys are central to the product the agency is creating.
The broader white-label voice AI platform guide explains the reseller model before the vendor-level comparison below.
Which Platform Gives an Agency the Best Operating Model?
Trillet removes more of the work between signing a client and delivering the service. Retell and Vapi offer more freedom below the application layer, but the agency must supply or purchase the client-facing product around them.
| Agency question | Trillet | Retell | Vapi |
|---|---|---|---|
| Fastest route to a branded offer | Ready-made Studio and Agency plans | Build a portal or add a third-party wrapper | Build a portal or add a third-party wrapper |
| Client access | Isolated branded workspaces | Agency supplies the client layer | Agency supplies the client layer |
| Client pricing control | Custom minute markup on Agency | Agency builds billing and markup | Agency builds billing and markup |
| Support accountability | One core Trillet relationship on the standard hosted service | Agency owns the product layer and coordinates its stack | Agency owns the product layer and coordinates its stack |
| Engineering burden | Lower, because the reseller product is included | Higher, with more low-level control | Higher, with broad API and provider control |
| Best fit | Business-first agencies scaling client delivery | Technical teams engineering a voice product | Technical teams building an API-first voice product |
Retell and Vapi are not wrappers. They are first-party infrastructure and orchestration products that other companies build wrappers around. The practical agency question is whether their added flexibility is worth owning the missing portal, billing, onboarding, and support systems.
How Do the Current Prices Affect Agency Margin?
Trillet bundles the agency application and an included usage allowance, while Retell and Vapi separate more of the voice stack into variable components. An agency should compare total delivery cost per client, not the lowest number printed beside a minute.
As of September 2026:
| Platform | Published pricing basis | What the agency must account for |
|---|---|---|
| Trillet Studio | $99/month, 1,000 included AI minutes | Three-workspace hard cap, three phone numbers, branding on a Trillet-hosted address |
| Trillet Agency | $299/month, 3,000 included AI minutes | Unlimited workspaces, 10 phone numbers, custom domain, branded emails, custom minute markup |
| Trillet usage after allowance | $0.12/minute | Platform, STT, LLM, and TTS included; telephony separate |
| Retell | $0 fixed platform subscription, $0.07 to $0.31/minute | Final rate depends on voice infrastructure, TTS, LLM, telephony, and optional features |
| Vapi | Core $29/month; higher tiers use hosting-based or custom pricing | Provider, model, telephony, and applicable hosting costs remain part of the total |
Trillet web calls have no telephony fee, and bring your own telephony has no Trillet telephony fee. Trillet-provided US telephony starts at $0.014 per minute, international rates vary, and the transferred portion costs $0.05 per minute after the AI usage charge stops.
Retell's range can be cheaper with economical components and custom telephony. Vapi can also be very cost-efficient when a technical team brings provider keys and optimizes the stack. Those savings are real, but an agency should add the cost of building or buying client access, billing, reporting, and support operations before comparing gross margin.
Use the voice AI pricing per minute guide to model matched telephony, usage, and client-count assumptions.
What to do: calculate one client at expected monthly minutes, then add every fixed platform, wrapper, provider, phone-number, compliance, and support cost. Repeat the calculation at 5, 20, and 50 clients to see whether the operating model protects or compresses margin.
What Must an Agency Build Around Retell or Vapi?
An agency using Retell or Vapi directly must create the commercial experience its clients buy. The exact workload depends on the software the agency already owns, so a fixed development-cost or launch-time claim would be misleading.
That product layer commonly includes:
- A branded client login and domain
- Workspace isolation and permissions
- Usage markup, invoicing, and payment collection
- Repeatable onboarding and configuration
- Cross-client reporting and account management
- A support process spanning the agency's code and underlying providers
An agency can build those capabilities or use a third-party wrapper. A wrapper can be a rational way to reach market quickly, but documented classic wrappers over Retell or Vapi generally add another subscription and support boundary above the underlying provider account.
Trillet includes the agency layer in its Studio and Agency plans. The current allowances and feature gates are on the Trillet white-label pricing page.
What to do: decide whether custom software is part of the agency's competitive advantage. If it is, Retell or Vapi may be the better foundation. If clients are buying outcomes rather than software engineering, price the time and support burden before committing to a build.
Where Does Retell Win?
Retell wins when the team wants granular model selection, transparent component pricing, and control over the voice implementation. Its published range lets engineers trade cost against voice quality and model capability for each use case.
That flexibility is valuable when the voice agent itself is the software product. It can also produce a lower raw per-minute rate than Trillet when the team chooses economical components and already has telephony and application infrastructure.
The trade-off for an agency is ownership of the surrounding product. Retell does not publish a turnkey agency portal with custom domains, isolated client workspaces, and rebilling, although its APIs and limited widget-brand controls support custom development.
What to do: choose Retell when the agency has engineers, wants the component choices to be a differentiator, and has budgeted for the client and support layer.
Where Does Vapi Win?
Vapi wins when a development team wants broad provider choice, API-first control, and bring your own keys. It is a well-funded, battle-tested orchestration layer for teams that want to decide how each part of the voice product works.
Vapi's current packaging should not be reduced to the old $0.05 per minute headline. As of September 2026, its public offer starts with a $29 Core plan and adds provider and component costs, while Pro and Premier use different hosting or contract terms.
For an agency, Vapi becomes a complete branded service after the agency builds the customer experience or adds a separate white-label product. That can still be the right choice when proprietary software, provider selection, or deep integration is what clients are paying for.
What to do: choose Vapi when the agency wants to own the application and has the technical capacity to operate provider credentials, billing, client access, and support.
Where Does Trillet Win?
Trillet wins when the agency wants to protect margin by standardizing delivery rather than maintaining a custom product stack. Clients see the agency's brand, while the agency works with one Trillet team on the standard hosted service.
Studio provides three isolated workspaces with custom logo, name, and colours on a Trillet-hosted address. Agency adds unlimited workspaces, the agency's own custom domain, branded emails, custom minute markup, and priority support. Both plans include a 7-day card-required trial, with plan-specific limits and no charge until day 8 if cancelled in time.
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 connects to them through MCP, APIs, webhooks, and integration partners.
Trillet gives up some of the low-level provider freedom exposed by Retell and Vapi. Its advantage is operational: fewer systems to coordinate during onboarding, one accountability path when something breaks, and a repeatable service the agency can deliver across clients.
What to do: choose Trillet when the agency's advantage is sales, service design, and client relationships rather than building voice infrastructure.
How Does Compliance Change the Choice?
Compliance is a delivery and contracting question, not a badge comparison. The agency must know which vendors process call data, which agreements apply, how long data is retained, and who is responsible for configuration and lawful use.
Trillet holds SOC 2 Type II and ISO 27001 certifications. BAAs are available on Agency and Enterprise after Trillet's standard process, while private cloud, on-premise deployment, data residency, SSO, RBAC, dedicated infrastructure, and SLA commitments require the applicable enterprise or partner agreement.
Retell publishes HIPAA and BAA support, personal-information redaction, recording controls, and custom retention options. Vapi's provider flexibility can support different compliance designs, but the customer must confirm the Vapi agreement and every selected speech, model, and telephony provider.
What to do: map the complete data path before promising compliance to a client. Confirm the contract, BAA or DPA, provider eligibility, retention, recording consent, telephony, and outreach rules for the actual workflow.
Does Native Architecture Matter to an Agency?
Architecture matters only when it changes the agency's economics or accountability. Trillet's white-label tools are part of the platform that runs and manages the agents, while Retell and Vapi expose infrastructure that an agency can turn into its own product.
On Trillet's standard hosted service, the agency contracts with Trillet and Trillet manages the underlying technology suppliers. Bring your own telephony, customer-selected providers, and custom deployments are explicit exceptions that can add another relationship.
A classic wrapper instead places a branded portal over a separately maintained upstream Retell, Vapi, or other voice-platform account. That model can provide useful provider choice, but it can also split billing and support between the wrapper and the engine. The wrapper versus native platform guide examines that trade-off in detail.
What to do: ask who invoices the agency, who holds provider credentials, who resolves a failed call, and whether the client portal and voice service share one support owner. Those answers are more useful than the word "native" by itself.
When Is Trillet Not the Right Fit?
Trillet is not the right fit when the agency is building proprietary voice software and needs component-level choice to be the product. Retell or Vapi is usually the better foundation for a capable engineering team that wants to select providers, control low-level behavior, and own the customer application.
Trillet can also be more platform than a technical team needs for one experimental agent. A low-cost Retell configuration or Vapi with economical provider keys may minimize raw infrastructure cost when branded client operations are not required.
What to do: choose Trillet when removing product development and multi-client operations is worth more than component freedom. Choose Retell or Vapi when that freedom is what creates customer value.
Which Platform Should an Agency Choose?
Choose based on what the agency wants to own. Trillet packages the reseller business, Retell packages flexible voice infrastructure, and Vapi packages developer-first orchestration.
- Choose Trillet to launch and scale a branded service with client workspaces, margin controls, orchestration, integrations, and one core support path.
- Choose Retell to engineer on granular, model-flexible voice infrastructure with transparent component choices.
- Choose Vapi to build an API-first voice product with broad provider choice and bring your own keys.
- Choose a third-party wrapper when Retell or Vapi flexibility matters but building client portals and billing does not.
Agencies choosing the finished-platform route can review Trillet White-Label. Teams choosing infrastructure should prototype the exact model, telephony, client-management, and support configuration they expect to operate.
Frequently Asked Questions
Can agencies white-label Retell or Vapi?
Neither publishes a turnkey first-party agency portal with the complete custom-domain, client-workspace, and rebilling package. Retell offers limited widget-brand control, and both platforms expose building blocks for a custom application. Agencies can also use third-party wrappers.
Is Trillet's $0.12 per minute price all-inclusive?
No. It includes Trillet's platform, STT, LLM, and TTS after the plan allowance, but excludes telephony. Web calls and bring your own telephony add no Trillet telephony fee, while Trillet-provided US telephony starts at $0.014 per minute and international rates vary.
Is Retell cheaper than Trillet?
It can be cheaper at the raw infrastructure level, especially with economical models and custom telephony. The agency must also price the client portal, branding, billing, onboarding, compliance work, and support layer that Trillet includes.
How much does Vapi cost in 2026?
As of September 2026, Vapi's public packaging starts at $29 per month for Core, plus provider and component costs. Pro uses hosting-based pricing with a minimum commitment, and Premier is custom, so the actual call cost depends on the selected stack.
Are Retell and Vapi wrappers?
No. Retell is first-party voice infrastructure, and Vapi is first-party developer orchestration. Third-party agency products can wrap their services with branding, client workspaces, and billing.
Updated for September 2026: corrected Trillet's Studio and Agency allowances, replaced Vapi's retired pricing headline, and refocused the comparison on agency margin, delivery, client ownership, and support accountability.
