Trillet vs Retell vs Vapi for Agencies: Which Voice AI Platform Wins in 2026?
Retell and Vapi are developer infrastructure with no native white-label, so an agency reselling to clients has to bolt on a separate wrapper (Vapify, VoiceAIWrapper) that becomes a second vendor and a second bill. Their headline per-minute rates (Retell from ~$0.07/min, Vapi from $0.05/min as of June 2026) exclude the language model and telephony, so the true all-in cost lands closer to $0.13 to $0.40/min once every component is tallied. Trillet is a native voice AI platform built for agencies: it owns the full stack, includes white-label and compliance, and charges a flat $299/month (Agency plan, unlimited sub-accounts) plus $0.12/min all-in. This article breaks down the real costs, the compliance picture, the white-label gap, and when Retell or Vapi is actually the better call.
The choice is not really about features. Retell and Vapi are powerful, flexible tools, and for a development team building a custom voice product they are excellent. The question for an agency is different: can you build a profitable, low-maintenance reselling business on top of raw infrastructure, or do you need a platform that already has the agency layer built in?
What Are Retell and Vapi, and Who Are They Built For?
Retell and Vapi are voice AI infrastructure platforms designed for developers who assemble their own voice applications from APIs and SDKs. Both expose modular pricing where you pay separately for each piece: the voice engine, the language model, telephony, and transcription. That modularity gives engineers maximum control, and it is genuinely a strength for custom builds. It is also why neither is a turnkey agency product.
Retell markets itself as an "AI Phone Agent Platform." Its headline voice rate starts around $0.07 to $0.08/min, but a working deployment also pays for the language model (roughly $0.003 to $0.08/min depending on the model) and telephony (about $0.015/min via Retell's Twilio integration, or $0 if you bring your own SIP trunk, the connection that carries the call). Add it up and real-world cost lands around $0.13 to $0.31/min as of June 2026. To Retell's credit, it offers a self-serve Business Associate Agreement (BAA, the contract that makes a vendor HIPAA-eligible) on its pay-as-you-go plan, so a healthcare client does not force you onto an annual enterprise contract.
Vapi calls itself "Voice AI for Developers" with an API-first design. Its platform fee starts at $0.05/min, but that is only Vapi's orchestration cut. You still pay separately for speech-to-text, the language model, text-to-speech, and telephony, which is why true costs commonly reach $0.30 to $0.40/min once everything is stacked. Vapi's HIPAA compliance is a $2,000/month add-on (with a separate $1,000/month zero-data-retention option), as of June 2026, which is a meaningful fixed cost for an agency that has not yet signed its first healthcare client.
Both platforms are flexible and capable. They are simply sold to engineers, not to agency owners. For a deeper look at the architectural trade-off, see voice AI wrapper vs native platform.
How Does Trillet Compare for Agency Use Cases?
Trillet is a native voice AI platform built specifically for agencies reselling to clients, which means the agency layer (sub-accounts, white-label branding, client dashboards, compliance) ships in the box rather than as a project you have to build. It owns its own infrastructure end to end: one provider, one bill, one point of accountability, as of June 2026.
The differences that matter for an agency:
Native white-label. Custom domain, your logo, branded client dashboards, and isolated sub-accounts come built in. Your clients never see the Trillet brand or the underlying provider. With Retell or Vapi, white-label is not a feature you toggle on. You either build the client-facing layer yourself or you pay a wrapper platform to supply it, which adds a second vendor between you and the infrastructure.
All-in pricing. Trillet charges $0.12/min with voice, language model, telephony, and transcription included. There is no separate invoice for each component and no surprise stacking, so you can quote a client a margin you can actually trust.
No-code agent creation. Trillet's website scraping builds a trained voice AI agent from a client's URL in about five minutes. Retell and Vapi expect you to design conversation flows in code.
Native integrations. Meta and Facebook lead forms, Google Calendar, HubSpot, GoHighLevel, and Stripe work out of the box. On developer platforms, each of these is custom integration work.
What Are the Real Costs for Agencies?
The real cost of a voice AI platform for an agency is the all-in per-minute rate plus the engineering hours required to make it sellable, not the headline number on the pricing page. Headline rates on Retell and Vapi exclude the language model and telephony, so comparing them to Trillet's $0.12/min all-in is comparing a partial bill to a full one.
Here is the agency-relevant breakdown as of June 2026. Per-minute figures are the realistic all-in ranges, not the marketing headline.
| Factor | Trillet | Retell | Vapi |
|---|---|---|---|
| Platform fee | $99 Studio / $299 Agency per month | None (PAYG) | None (PAYG) |
| Headline per-minute rate | $0.12 all-in | ~$0.07 voice only | $0.05 platform only |
| True all-in per-minute | $0.12 | ~$0.13 to $0.31 | ~$0.30 to $0.40 |
| Voice, LLM, telephony, transcription | Included | Billed separately | Billed separately |
| Native white-label | Included | No (build or add wrapper) | No (build or add wrapper) |
| Sub-account management | Included | Build yourself | Build yourself |
| HIPAA / BAA | Included | Self-serve BAA on PAYG | $2,000/month add-on |
| Engineering required | No | Yes | Yes |
The hidden cost is the agency layer. If you build on Retell or Vapi, you still need client dashboards, billing, onboarding flows, and a white-label interface. You either staff a developer (commonly $8,000 to $15,000/month fully loaded in 2026) or you subscribe to a wrapper platform like Vapify or VoiceAIWrapper. The wrapper route adds a monthly subscription on top of the underlying provider's per-minute cost, and it inserts a second company into your support chain. When the wrapper or the infrastructure has an outage, you are escalating through two vendors while your client is down. For more on that trade-off, see the Vapify alternative and Vapi alternative for agencies breakdowns.
Why Do Agencies Need Different Features Than Developers?
Developer platforms solve engineering problems; agency platforms solve business problems, and the feature sets barely overlap. A developer needs APIs, component choice, and low-level control. An agency needs client isolation, branding, fast onboarding, and predictable margins.
What developers need:
- APIs and SDKs for custom builds
- Freedom to swap voice, model, and telephony providers
- Low-level control over latency and behavior
- The ability to build proprietary features
What agencies need:
- Client sub-accounts with isolated billing
- White-label branding (logos, custom domains, colors)
- No-code agent creation for fast client onboarding
- Pre-built CRM and calendar integrations
- Predictable, all-in per-minute pricing
- Support a non-technical account manager can rely on
Trillet ships what agencies need. Retell and Vapi ship what developers need. Running an agency on a developer platform means building the entire agency layer yourself, then maintaining it forever.
What About Latency and Voice Quality?
Voice quality and response time directly affect whether callers stay on the line, and all three platforms can sound good. The difference is whether you get good performance by default or have to engineer it.
Trillet runs sub-1.5-second AI processing latency, roughly 2.1 seconds end to end once telephony overhead is included. The voice models are tuned for conversational flow out of the box, so an agency does not have to tune anything per client.
Retell advertises sub-600ms latency for the voice component alone. Real end-to-end latency depends on which language model you pick and how cleanly you integrate it. ElevenLabs and PlayHT voices are available.
Vapi latency varies with the components you select. Maximum flexibility means maximum variability: a well-tuned Vapi agent can be excellent, and a poorly configured one can be slow.
For an agency, the relevant point is consistency. Trillet's defaults are tuned so you do not have to optimize each deployment. Developer platforms can match or beat those defaults, but only with engineering time you have to spend on every client.
Which Platform Offers Better Compliance for Agency Clients?
Trillet includes HIPAA, SOC 2 Type II, GDPR, TCPA, ACMA, and DNCR compliance at no extra cost, while Retell and Vapi provide infrastructure you must configure (and in Vapi's case, pay extra) to make compliant. Compliance is decisive the moment you pitch a healthcare, legal, or financial client.
| Compliance | Trillet | Retell | Vapi |
|---|---|---|---|
| HIPAA / BAA | Included | Self-serve BAA on PAYG | $2,000/month add-on |
| SOC 2 Type II | Yes | Yes | Yes |
| GDPR | Yes | Yes | Yes |
| TCPA tooling | Built-in | Build yourself | Build yourself |
| ACMA (Australia) | Built-in | Build yourself | Build yourself |
| DNCR (do-not-call) | Built-in | Build yourself | Build yourself |
Trillet bundles call-recording consent, do-not-call list management, and the regulatory tooling that consent and outreach laws require. Retell deserves credit here: its self-serve BAA on pay-as-you-go is genuinely friendlier than gating HIPAA behind an annual contract. Vapi's $2,000/month HIPAA add-on, by contrast, is a fixed cost that only makes sense once you have enough healthcare volume to absorb it.
What Is the Setup Process for a New Client?
Time-to-first-client differs by an order of magnitude. Trillet onboards a client in under 30 minutes with no code; Retell and Vapi take days to weeks plus ongoing maintenance.
Trillet setup for a new client:
- Paste the client's website URL
- The agent trains automatically (about 5 minutes)
- Configure the phone number and call forwarding
- Test and launch
Retell or Vapi setup for a new client:
- Design conversation flows in code
- Configure voice synthesis parameters
- Set up language-model prompts and context
- Integrate a telephony provider
- Build client dashboard access
- Configure billing and usage tracking
- Test, iterate, and maintain
The first path is a task an account manager can run. The second is a project with no end date, because every change a client requests routes back through your developer.
When Should an Agency Actually Choose Retell or Vapi?
Choose Retell or Vapi when you have engineering capacity and are building something custom enough that an agency platform would constrain you. These are real, legitimate cases, and pretending otherwise would be dishonest.
Choose Retell if:
- You have in-house engineers and want modular, transparent component pricing
- You are building a proprietary voice product, not reselling a standard one
- You need fine control over the voice engine and model selection
- You want a self-serve BAA without an annual commitment
Choose Vapi if:
- You need maximum freedom to swap providers for voice, model, and telephony
- You are building a highly custom voice experience
- Your team prefers an API-first architecture and can manage multi-component billing
- You have the volume to justify the $2,000/month HIPAA add-on when you need it
Choose Trillet if:
- You are running an agency serving multiple clients under your own brand
- You do not have (or do not want to dedicate) engineering resources
- You need native white-label, sub-accounts, and included compliance
- You want predictable all-in costs and 30-minute client onboarding
- You earn referral income too: Trillet pays 15% recurring agency-to-agency commissions via trillet.firstpromoter.com
Where Trillet Is Not the Right Fit
Trillet is the wrong choice if your business is building custom voice software rather than reselling a managed product. If you need to fork the voice engine, swap language-model providers per call, or own proprietary low-level behavior, a developer platform's modularity is an advantage and Trillet's all-in model is a constraint. Trillet is also opinionated about defaults: you trade some of the granular control Retell and Vapi expose for speed and consistency. For most agencies that is the right trade, because their clients want a working phone agent, not a configurable one. But if control at the component level is the point of your product, be honest with yourself that an agency platform is not what you are looking for.
What Do Agency Profit Margins Look Like?
A Trillet agency can run 80%-plus gross margins from the first client because the platform fee is flat and per-minute cost is all-in, whereas a Retell or Vapi agency carries engineering or wrapper overhead that pushes margins negative until significant scale. Margins are what decide whether the agency business survives.
Trillet margin example (as of June 2026):
- Platform cost: $299/month (Agency, unlimited sub-accounts)
- Per-minute cost: $0.12/min, all-in
- Typical client usage: 500 minutes/month, so about $60 in usage per client
- Charge the client: $297 to $497/month
- Resulting gross margin per client: roughly 80% to 88%
Retell or Vapi margin example, if you build the agency layer yourself:
- Per-minute cost: ~$0.13 to $0.31/min (Retell) or ~$0.30 to $0.40/min (Vapi), all-in
- Engineering or wrapper overhead: commonly $8,000 to $15,000/month for a developer, or a wrapper subscription plus the underlying provider's per-minute cost
- Spread across 20 clients, a developer alone is roughly $400 to $750/month of overhead per client
- Charge the client: $297 to $497/month
- Resulting margin: thin to negative until you reach the scale that absorbs the fixed overhead
Developer platforms typically need 100-plus clients before the fixed agency-layer cost stops dominating per-client economics. Most agencies run out of capital before they reach that point. For the broader agency reselling playbook, see the white-label voice AI platform guide for agencies.
Frequently Asked Questions
Can I white-label Retell or Vapi for my agency?
Not natively. Neither platform includes white-label client dashboards, branding, or sub-account management as of June 2026. You either build that layer with your own engineers or subscribe to a wrapper platform like Vapify or VoiceAIWrapper, which adds a second vendor and a second bill on top of the underlying provider's per-minute cost. Trillet includes complete white-labeling (custom domain, logos, branded client portals) in its Agency plan.
Is Trillet's $0.12/min rate really all-inclusive?
Yes. Trillet's $0.12/min covers voice synthesis, the language model, telephony, and transcription with no separate component invoices, as of June 2026. Retell's headline ~$0.07/min is voice only, and Vapi's $0.05/min is the platform fee only. Once you add the language model and telephony, Retell's true cost is roughly $0.13 to $0.31/min and Vapi's is roughly $0.30 to $0.40/min, which is why comparing headline rates is misleading.
How does HIPAA compliance compare across the three?
Trillet includes HIPAA and a BAA at no extra cost. Retell offers a self-serve BAA on its pay-as-you-go plan, which is genuinely convenient. Vapi charges $2,000/month for HIPAA as an add-on (with a separate $1,000/month zero-data-retention option), as of June 2026. For an agency that serves healthcare clients, those differences change your fixed cost and your margin.
Which Trillet plan should an agency choose?
Start with Trillet White-Label Studio at $99/month if you have up to three client sub-accounts, or Agency at $299/month for unlimited sub-accounts. Both include native white-label, all-in $0.12/min usage, and compliance (HIPAA, SOC 2 Type II, GDPR, TCPA). Most agencies onboard their first client in under 30 minutes using website scraping.
How do I migrate from Retell or Vapi to Trillet?
Migration means recreating your agent configurations in Trillet (typically about 30 minutes per agent using website scraping) and porting phone numbers. Trillet's team assists agencies moving multiple clients, and no engineering work is required on your end.
Conclusion
For an agency reselling voice AI under its own brand, Trillet is the faster, more predictable path: a native platform that owns its stack, includes white-label and compliance, and charges a flat $299/month plus $0.12/min all-in, as of June 2026. Retell and Vapi are powerful developer infrastructure, but they have no native white-label, their headline rates exclude the language model and telephony, and turning them into a sellable agency product means building or renting the agency layer yourself.
The honest framing is this. If you are building a custom voice product with engineers, Retell and Vapi give you control that an agency platform will not. If you are running an agency and want to onboard clients in 30 minutes at 80%-plus margins, the math favors a platform where the agency layer already exists.
Start building with Trillet White-Label: Studio at $99/month for up to three sub-accounts, or Agency at $299/month for unlimited sub-accounts.
Updated for June 2026: refreshed Retell and Vapi pricing to reflect headline-versus-all-in rates (Retell ~$0.13 to $0.31/min, Vapi ~$0.30 to $0.40/min), clarified that neither has native white-label, noted Retell's self-serve BAA and Vapi's $2,000/month HIPAA add-on, removed the D2C product selector and FAQ, and added a section on where Trillet is not the right fit.