One AI Build

Synthflow AI vs Vapi

Synthflow AI publishes its pricing; Vapi does not.

Both pages checked by August 19, 2026
Synthflow AIAI only
$2500/mo
Enterprise plan
Enterprise voice AI platform with in-house telephony for automating inbound and outbound calls, sold through sales-scoped contracts rather than published self-serve plans, with the agent designed, tested and launched by the customer in Synthflow's Flow Designer or Prompt Builder.
VapiAI only
Pricing not published
no published plan
Developer platform for building voice AI agents: Vapi hosts the orchestration layer and charges a per-minute hosting fee, while you pick and pay for your own speech-to-text, LLM, text-to-speech and telephony providers and write the assistant, tools and server hooks yourself.

The differences that matter

  • Synthflow AI offers a trial (Yes, you can start and build your AI agent for free using our library of industry templates or build your own. You can design custom call flows, set up voicemail detection, and configure integrations without any upfront cost. When you are ready to launch your Agent, you start to use a Pay-As-You-Go (PAYG) model: you only pay for the actual calls and chats conducted.); Vapi advertises none.
  • Synthflow AI publishes prices. Vapi makes you ask.

Feature by feature

CapabilitySynthflow AIVapi
Live transferYesYes
Books appointmentsYesYes
Text follow-upYesYes
Outbound callsYesYes
SpanishYesYes
Human backupNoNo
Call recordingsYesYes
TranscriptsYesYes
Spam screeningunstatedunstated
Custom voiceYesYes
APIYesYes

"unstated" means the vendor doesn't claim it in their own documentation. It is not the same as no — it means nobody will put it in writing.

Synthflow AI plans

PlanPublished priceIncludesOver that
EnterpriseEnterprise contracts start at $30,000 annually(annual billing)——

Vapi plans

PlanPublished priceIncludesOver that
Build$0.05 / min——
ScaleFixed Platform fee and committed volume(annual billing)——

Synthflow AI sources

Vapi sources