How to Switch from Vapi, Retell, or Synthflow to Trillet (Migration Guide)

Migrating an agency off Vapi, Retell, or Synthflow to Trillet is mostly a recreate-and-re-point exercise, not a rip-and-replace, and you can run both platforms side by side so no client ever drops a call. As of June 2026, the honest pain points are real but bounded: you rebuild each agent by hand (there is no automated config export between platforms), you update call forwarding on every client number, and you manage a client transition window of one to two weeks. What you trade that work for is consolidation onto one owned all-in-one platform at a flat $299/month with compliance included, instead of a two-vendor dev stack (Vapi or Retell plus a wrapper) or Synthflow's $2,000/month white-label toolkit.

This guide covers platform-specific migration paths, a step-by-step checklist, what transfers and what does not, and how to run a parallel transition that keeps every client live throughout the switch.

Why Agencies Switch Voice AI Platforms

Agencies leave their current voice AI platform for five recurring reasons: pricing instability, reliability failures, compliance gaps, wrapper dependency risks, and outgrowing limited platforms. The trigger is rarely a single event. It is usually a pattern of problems that compound until the cost of staying exceeds the cost of switching. For the broader context on how the white-label voice AI market splits between native platforms and wrapper stacks, see the white-label voice AI platform guide for agencies.

Pricing instability and high platform fees are the most common driver. Synthflow's white-label tier runs around $2,000/month as of June 2026, a four-figure fee before any usage. Voicerr raised prices from $28/month to $199-$299/month in early 2026, a 7-10x increase that erased the cheap wrapper entry point. Vapi's modular billing can produce several separate invoices per deployment, with total costs only revealing themselves after the call completes.

Reliability and support failures hit agencies where it hurts most: client trust. Wrapper platforms inherit every outage from their underlying providers. When Vapi goes down, every Vapify agency goes down with it, and the agency can only file a ticket with the wrapper, which files a ticket with the provider, which prioritizes its own direct customers first.

Compliance gaps lock agencies out of the most profitable verticals. Healthcare practices require HIPAA and financial services need SOC 2, yet as of June 2026, most wrapper platforms publish no compliance certifications. An agency that signs a dental group or law firm without verified compliance is carrying liability it cannot insure against. The fifth driver is outgrowing GHL's built-in Conversation AI V3, which handles basic calls but offers no white-label branding and no multi-agent orchestration once an agency scales past a handful of clients.

Migrating from Vapi or Retell (Developer Platforms to No-Code)

Vapi and Retell are developer infrastructure platforms. They provide raw APIs, SDKs, and modular pricing that requires engineering resources to build on, and neither ships a client-facing white-label dashboard out of the box. To resell them, agencies either build their own front end or bolt on a wrapper, which is what makes a Vapi or Retell deployment a two-vendor stack: the infrastructure provider plus whatever layer your clients actually log into. Trillet is a single owned all-in-one platform with a no-code agent builder, white-label dashboards, and client management included, so the migration collapses that two-vendor stack into one provider with one bill and one support channel.

What Changes (as of June 2026)

Capability	Vapi/Retell	Trillet
Agent creation	Code-based, requires developer	5-minute website scraping, no code
Pricing model	Modular, variable ($0.12-0.25/min fully loaded)	$299/month + $0.12/min flat
White-label branding	Build your own dashboard	Custom domain, logo, client dashboards included
Sub-account management	Build your own	Unlimited sub-accounts (Agency plan)
Billing automation	Build your own	Native Stripe integration with minute markup
Compliance	Available (Retell has HIPAA/SOC 2; Vapi varies)	HIPAA, SOC 2, GDPR, TCPA included on all plans
Support	Discord/email (enterprise gets Slack)	Dedicated Slack support (Agency plan)

Migration Steps

Export your agent configurations. There is no automated export between platforms, so document the prompts, knowledge bases, voice settings, and call flows you built on Vapi or Retell manually.
Recreate agents on Trillet. Paste each client's website URL into Trillet's builder, which scrapes the site, reviews, and social media to auto-build a knowledge base, then add any custom prompts from your old configuration. Roughly 5 minutes per agent versus the hours or days the original build took.
Redirect call forwarding. Update the forwarding destination from the old Vapi or Retell number to the new Trillet agent number, about 30 seconds per client, with no change to the client's business phone number.
Test each agent with 3-5 calls covering appointment booking, after-hours, FAQ, and industry-specific edge cases. Trillet includes recordings and transcripts for review.
Update your billing to Trillet's native Stripe integration and set per-minute markups, so clients see your brand and your invoice, not Trillet's.

What to do: Budget one day for migrating 10-15 clients. The heaviest lift is recreating custom prompts, not the technical setup. For a detailed feature-by-feature breakdown of what you gain and lose, see the Trillet vs Retell vs Vapi comparison for agencies.

Migrating from Synthflow (a $2k/Month Toolkit to a Flat $299)

Synthflow positions its white-label offering as a premium toolkit. As of June 2026, agencies that want full Synthflow white-labeling are looking at roughly $2,000/month for the dedicated white-label tier, or an Enterprise contract that runs around $30,000/year, on top of per-minute usage. That is a different order of magnitude from Trillet's Agency plan at $299/month with $0.12/minute usage, unlimited sub-accounts, and all compliance certifications included. The migration is less about cutting per-minute rates and more about dropping a four-figure monthly platform fee.

Cost Comparison at Scale

The fair comparison is white-label tier to white-label tier, the capability an agency reselling under its own brand actually needs. Trillet's Agency plan includes 300 minutes; the calculations below add $0.12/minute beyond that.

Scenario	Synthflow White-Label (~$2,000/month + usage)	Trillet Agency ($299/month, 300 min included)
10 clients, 200 min/month each (2,000 min)	$2,000 + ~$260 usage = ~$2,260/month	$299 + $204 overage (1,700 min) = $503/month
20 clients, 200 min/month each (4,000 min)	$2,000 + ~$520 usage = ~$2,520/month	$299 + $444 overage (3,700 min) = $743/month
50 clients, 200 min/month each (10,000 min)	$2,000 + ~$1,300 usage = ~$3,300/month	$299 + $1,164 overage (9,700 min) = $1,463/month

Synthflow is a capable platform, and its Enterprise tier (around $30,000/year) adds support and SLA commitments that Trillet's self-serve Agency plan does not match line for line. But for an agency reselling branded voice agents at healthy margins, paying a roughly $2,000/month platform fee before a single minute is billed is hard to justify when Trillet bundles the white-label dashboard, unlimited sub-accounts, custom domain, and native CRM integrations into $299/month. The usage rates are close; the platform fee is where the gap lives.

Migration Steps

Document your Synthflow flows. Screenshot each decision path, prompt, and action node. Trillet uses dynamic conversation architecture rather than rigid flows, so you will not recreate the same structure; instead you describe the agent's behavior in natural language and Trillet's engine handles branching and backtracking automatically.
Recreate agents using website scraping. Paste each client's URL and supplement with the prompts and business rules from your Synthflow flows. Trillet's agents can backtrack mid-conversation, something Synthflow's flow architecture cannot do once a decision node is passed.
Switch call forwarding to each client's new Trillet agent number, about 30 seconds per client.
Test thoroughly, focusing on edge cases where the caller changes direction, asks an unexpected question, or needs to go back to a previous topic. These are where Trillet's dynamic architecture behaves differently from Synthflow's linear flows.
Cancel Synthflow after the parallel period. Run both for 7-14 days, then cancel once Trillet agents are performing at least as well.

Migrating from Wrapper Platforms (Voicerr, Vapify, VoiceAIWrapper)

Wrapper platforms add a white-label dashboard on top of Vapi or Retell's infrastructure without controlling the underlying voice AI, so migrating to Trillet replaces a multi-vendor dependency chain with one native platform: one provider, one support channel, one point of accountability.

A wrapper stack has five or more potential failure points (the wrapper layer, the voice AI provider, the LLM provider, the TTS provider, and telephony). At 99.5% uptime per layer, five layers compound to roughly 97.5% effective uptime, or over 18 hours of potential downtime per month, and when something breaks the agency can only file a ticket with the wrapper and wait. Voicerr's 2026 price increase from $28 to $199-$299/month made the trade-off harder to justify: at $299/month it matches Trillet's Agency plan price but ships without native infrastructure, with compliance inherited from its providers rather than owned end to end, and without direct engineering support.

Migration Steps

Inventory your current agents (most wrappers let you export or copy configurations; if not, document prompts manually), then recreate each on Trillet via website scraping. The prompts you wrote through the wrapper transfer directly, since Trillet uses the same natural-language instruction format. Move call forwarding to the new Trillet agent numbers, set up custom domain and branded dashboards before switching clients over so the transition is invisible, then decommission the wrapper. If you were also paying Vapi or Retell directly, cancel those accounts too, leaving one invoice instead of two or three.

What to do: Wrapper migrations are typically the simplest, since wrapper agents are already configured in natural language and those prompts move straight to Trillet's native engine. Budget half a day for 10 clients.

Migrating from GHL's Built-In Voice AI

GoHighLevel's Conversation AI V3 added native voice, but it is a CRM feature, not a dedicated voice AI platform, so agencies hit limited agent customization, no white-label voice branding, and no multi-agent orchestration once they scale past their first few clients. The good news is this migration is additive, not destructive: you keep GoHighLevel as your CRM and only replace the voice layer, because Trillet integrates natively with GHL.

Recreate each agent on Trillet via website scraping, then forward client calls to Trillet agent numbers instead of GHL's built-in handler. Connect Trillet back to GHL via the native integration so call data, contact records, and appointment bookings sync automatically and your existing workflows keep running. Test the full loop end to end (call comes in, Trillet answers, books, syncs to GHL, triggers your workflow) for each client before going live.

The Migration Checklist

This checklist works regardless of which platform you are migrating from.

Sign up for Trillet Agency ($299/month) and set up custom domain, branding, and Stripe billing before creating any client agents, so your white-label identity is ready before clients see anything.
Create one client sub-account per client. Unlimited on the Agency plan.
Build agents via website scraping. Paste each client's URL, review the auto-generated knowledge base, and add custom prompts and business rules from your current platform.
Assign phone numbers. The Agency plan includes 10; additional numbers are $5/month each. These are the agent numbers clients forward calls to.
Update call forwarding on each client's phone. About 30 seconds per number, with no carrier call or porting required.
Test 3-5 calls per agent, covering appointment booking, FAQ, after-hours, and the scenarios specific to each client's industry.
Run parallel for 7-14 days, keeping your old platform active and routing a subset of calls to Trillet first, then expanding.
Switch billing to Trillet's native Stripe integration and set your per-minute markup.
Cancel the old platform once all clients are confirmed live on Trillet.

What You Keep and What You Lose

Client phone numbers, agent prompts, CRM data, and client relationships carry over; historical call logs, analytics, and flow-builder configurations do not. Because Trillet uses call forwarding rather than number porting, your clients' business numbers never change and the switch is invisible to their customers.

What Transfers

Client phone numbers. No changes; call forwarding updates in 30 seconds.
Agent prompts and business rules. Copy them manually from the old platform.
CRM data. GHL, HubSpot, or other CRM data stays in the CRM; Trillet connects via native integrations.
Client relationships. Set up branding before switching and the white-label transition is invisible to clients.

What Does Not Transfer

Call history, recordings, analytics. Historical data stays on the old platform; export what you need before canceling. Trillet starts fresh from the migration date.
Flow-builder configurations. Synthflow's visual flows do not map one-to-one to Trillet's dynamic architecture; you recreate behavior, not the flow structure.
Custom integrations built on Vapi or Retell APIs. Code written against those APIs must be rebuilt using Trillet's API or native integrations.

How to handle this: Export all call recordings, transcripts, and analytics during the parallel period. Most platforms retain data for 30-90 days after cancellation, but do not rely on that.

Running Both Platforms in Parallel

Run your old platform and Trillet simultaneously for 7-14 days. This is not optional; it is the difference between a smooth migration and a crisis.

How to Structure the Parallel Period

Days 1-3: Route 2-3 low-volume or low-sensitivity clients to Trillet and monitor call quality, response accuracy, and booking success rates.

Days 4-7: If the first batch performs well, migrate the next 5-10 clients, reviewing transcripts daily and adjusting prompts for any underperforming agents.

Days 8-14: Migrate the remaining clients. By now you have a repeatable process and have resolved the issues that surfaced earlier.

What to watch for: The first 48 hours after switching each client are when most issues surface, usually missing knowledge base entries (a service not listed on the client's website), incorrect business hours, or calendar permissions. All are fixable within minutes but need attention during the first week.

Cost of Parallel Operation

You will pay for both platforms during the overlap, Trillet's $299/month plus usage on top of whatever your old platform costs. Budget for 2-4 weeks of double billing, typically $300-$1,500 depending on the old platform, and treat it as an insurance premium against client disruption.

The Honest Caveat

Migration has a learning curve. Trillet's dynamic conversation architecture handles calls differently than Synthflow's flow builder or Vapi and Retell's code-based agents, so the first week per batch of clients requires extra attention: reviewing call transcripts, tweaking prompts, and adjusting for edge cases you did not anticipate. Agencies that have migrated report this adjustment period lasts roughly 5-7 days per batch.

After that, Trillet's no-code builder makes ongoing changes faster than the platforms they left. The 5-minute agent creation and 30-second call forwarding are real, but getting agents to production quality still takes the same iterative refinement any platform requires. There is no magic shortcut for tuning prompts and testing real conversations.

The payoff is a single platform with predictable pricing ($299/month flat plus $0.12/minute), native compliance, and direct engineering support. No more wrapper dependency chains that stack five failure points between you and your clients. No more five-invoice billing surprises. No more waiting for a developer to make a change to an agent. Predictable platform costs also make the sales math easier when you sit down with a prospect, which is the whole point of the missed call math framework for closing agency deals.

Trillet's Agency plan ($299/month, $0.12/minute, unlimited sub-accounts) includes HIPAA, SOC 2, GDPR, and TCPA compliance, custom domain, branded dashboards, and dedicated Slack support. Start at trillet.ai/whitelabel.

Frequently Asked Questions

How long does it take to migrate 20 clients from Vapi or Retell to Trillet?

Most agencies complete a 20-client migration in 2-3 days of active work, spread across a 7-14 day parallel period. Agent recreation takes roughly 5 minutes per client; the bulk of the time goes to testing, prompt refinement, and verifying call forwarding.

Do my clients need to change their phone numbers when switching platforms?

No. Trillet uses call forwarding, not number porting. Your clients keep their existing business numbers. You update the forwarding destination from the old platform's number to Trillet's agent number. The change takes about 30 seconds and is invisible to the client's customers.

Can I keep using GoHighLevel as my CRM after switching to Trillet?

Yes. Trillet integrates natively with GoHighLevel. You are replacing the voice AI layer, not the CRM. Call data, appointments, and contact records sync to GHL automatically through Trillet's native integration. Your existing GHL workflows continue running.

What happens to my call history from the old platform?

Call history, recordings, and analytics do not transfer between platforms. Export all data from your old platform before canceling. Trillet starts fresh with new call logs from the migration date. Most platforms retain data for 30-90 days after cancellation, but download everything during the parallel period to be safe.

Is Trillet actually cheaper than Synthflow for agencies?

For agencies that need full white-label resale, yes, by a wide margin on platform fees. As of June 2026, Synthflow's white-label tier runs around $2,000/month (or roughly $30,000/year at the Enterprise tier) before usage. Trillet's Agency plan is $299/month with $0.12/minute usage and includes unlimited sub-accounts, custom domain, native CRM integrations, and HIPAA/SOC 2/GDPR/TCPA compliance. Per-minute rates are similar between the two; the difference is the four-figure monthly platform fee Synthflow charges and Trillet does not.

Updated for June 2026: Refreshed the Synthflow comparison to reflect its roughly $2,000/month white-label tier (and ~$30,000/year Enterprise contract) rather than the retired legacy agency plan, reframed Vapi and Retell as developer infrastructure that requires a wrapper to resell (a two-vendor stack), tightened the migration steps, and added in-body links to the white-label guide and related agency resources.

How to Switch from Vapi, Retell, or Synthflow to Trillet (Migration Guide)