B
BSynthflow vs Vapi
Pricing, features, platforms and who each one suits — side by side.
S
Choose Synthflow if…
- you're in its core audience: contact centers, bpos
V
Choose Vapi if…
- you want a free plan to start with
- you're in its core audience: developers, customer support teams
Side by side
Feature Synthflow Vapi
Pricing modelContact for pricingFreemium
Starting price—$29/mo
Free plan
Free trial
API
Open source
Trains AI on your content—Yes
Data retention—Depends on customer config; free plan 14 days raw data; deleted on request
Security and compliance—SOC 2, HIPAA, PCI DSS
PlatformsWeb, APIWeb, API
CompanySynthflow AIVapi Inc. · United States
Full feature lists
S Synthflow
- Inbound and outbound AI phone agents
- Response time under half a second, with interruption handling
- Language switching during a call
- Warm handoff to human agents with full transcript
- Appointment booking, voicemail detection and SMS follow-ups
- 200+ integrations including Salesforce, HubSpot, Zendesk
- Pre-launch testing and staged rollout with approval
- US, EU and Latin America hosting regions
V Vapi
- Configurable voice, conversation flow and telephony
- Call testing and simulation before going live
- Real-time call monitoring and observability
- Built-in AI conversation guardrails
- Twilio, Vonage, Telnyx and Vapi SIP telephony
- Model providers passed through at cost
- SSO, OAuth and RBAC access controls
- SOC 2, HIPAA and PCI compliance
Their home pages
What each vendor shows first: the pitch, the plans and the sign-up.
Synthflow · synthflow.ai
Vapi · vapi.aiWhat you'd pay
The cheapest plan that fits, per month, billed yearly where the plan offers it.
What the free plans include
Synthflow
No free plan.
Vapi
- $5 free credits to get you started
- 2 organizations
- 4 concurrent calls
- 14 days raw data retention
All plans and prices
Synthflow
EnterpriseCustom
Vapi
No Success Package$0 to start, $0.05/min hosting
Core$29
Pro10% of Vapi hosting fee, $999/mo minimum
PremierCustom
Strengths and limitations
Synthflow
- SOC 2 Type II, ISO 27001, PCI DSS and HIPAA BAA compliance
- Works with major phone systems and SIP trunks
- White-label deployment with per-client workspaces
- Retention controls can delete recordings and transcripts after 30 days
- No free plan or trial
- Sold only as an annual enterprise agreement
- No published prices or per-minute rate
- SMS and WhatsApp limited to US workspaces
Vapi
- $5 free credits and no minimum minutes to start
- Model provider costs passed through with no markup
- Unlimited agents on every plan
- SOC 2, HIPAA and PCI compliance
- The hosting fee and provider costs add up; the page estimates $82–$129 for 1,000 minutes
- HIPAA compliance is a $2,000/month add-on
- The free tier has no support SLA and allows only 4 concurrent calls
- Pro requires a $999/month minimum
More comparisons
Other options to consider
BB
Free, from $299/mo
R
R
Free trial
R
Build, deploy and monitor AI voice agents that answer and place phone calls
Voice AgentsAPI
P
PP
Contact
P
Voice and chat AI agents for enterprise customer service, plus a voice model API
Voice AgentsAPI
Z
ZZ
Free trial
I
IAI customer agent that resolves support, sales and ecommerce conversations
From $49.50/mo
I
From $49.50/mo
I
AI customer agent that resolves support, sales and ecommerce conversations
Customer SupportAPI
G
GG
From $10/mo
Facts from each vendor's public pages, prices checked Oct 26, 2026. Editorial policy