No-code voice agent builder with a visual flow designer, now sold only on enterprise contracts the pricing page says start at $30,000 annually.
Enterprises replacing or fronting an existing contact centre, where the integration list matters more than the per-minute rate: the homepage names Cisco, Avaya, Genesys and RingCentral alongside HubSpot, Salesforce, GoHighLevel, Cal.com and Zapier, and says it works with any SIP-based provider. It fits buyers who want implementation done for them, since the pricing page states the contract covers onboarding, testing, training, launch support and ongoing optimisation. Agencies and resellers are catered for with documented subaccounts, white-labelling and Stripe-based reselling.
Anyone wanting to start small or self-serve should rule it out: the pricing page lists one plan, Enterprise, starting at $30,000 a year, and publishes no per-minute rate, no included minutes, no overage rate, no seat count and no free trial. Nothing about capacity is quantified either; the docs say only that concurrency is tied to your plan and is shared across subaccounts, and that custom telephony apps are unavailable below Enterprise. The latency position is also unclear: the homepage claims sub-100ms for in-house telephony and sub-500ms in its FAQ, while the documentation publishes no figure at all.
Pros
Cons
The pricing page publishes one plan, Enterprise, starting at $30,000 annually, with the final figure depending on call volume, concurrency, telephony setup, integrations, security needs and launch support. No per-minute rate, included minutes or overage rate appears on the page. The homepage FAQ separately says building is free and usage becomes pay-as-you-go per call at launch, without giving a rate.
Not a dependable one. The homepage cites sub-100ms latency for its in-house telephony in two places, while its FAQ on the same page claims sub-500ms latency. The documentation publishes no latency figure at all. Given latency is the deciding factor for voice agents, the inconsistency between a 100ms and a 500ms claim is worth resolving with the vendor before committing.
No number is published. The docs state concurrency is tied to your plan, that accounts and subaccounts share the main account total, that agency concurrency is set by account terms, and that additional capacity requires contacting sales. There is a separate concurrent calls page covering queueing and capacity planning, but it carries no numeric limits or tiers.
Only on Enterprise. The docs state custom telephony apps are not available on plans below Enterprise. The pricing page lists the supported options as Synthflow native telephony, SIP trunking or approved enterprise telephony, and the homepage says Synthflow works with any SIP-based provider. Whether phone numbers are included in the contract price is not stated anywhere on the pricing page.
Facts sourced from the vendor’s own site, last verified 2026-10-10.
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