vioscale
Comparison

Retell AI vs Synthflow AI

On the evidence we track, Retell AI leads this comparison with a composite score of 78/100. Scores are only directly comparable because these tools share a category; the full breakdown and every source is below.

Retell AI full profile →Synthflow AI full profile →
Machine formatsJSONMarkdownGraphQLor send Accept: application/json
★Retell AI78
Synthflow AI68
Score
Vioscale score
Retell AI78 / 100medium · 54%updating
Synthflow AI68 / 100high · 76%updating
Pricing
Free tier
Retell AI✓
Synthflow AI✗
Model
Retell AIfreemium
Synthflow AIcommercial
Price level
Retell AIlow
Synthflow AImid
Starting price
Retell AI$2
Synthflow AI$29
Transparent
Retell AI✓
Synthflow AI✓
Integrations
Count
Retell AI35
Synthflow AI200
Security
Gdpr
Retell AI✓
Synthflow AI✓
Hipaa
Retell AI✓
Synthflow AI✓
Pci
Retell AI–
Synthflow AI✓
Soc2
Retell AI✓
Synthflow AI✓
Reliability
Sla pct
Retell AI–
Synthflow AI99.99
Market
Availability

Capabilities

Feature-by-feature on the axes that matter for voice ai agents. “-” means undocumented, not absent.

Capabilities
Deployment model
Retell AINo code saas platform
Synthflow AINo code saas platform
Sub second latency and interruption barget in handling
Retell AI✗
Synthflow AI✓
Dynamic mid call API function execution
Retell AI✓
Synthflow AI-
Live human handoff and call transfer logic
Retell AI✓
Synthflow AI✓
Emotion prosody and custom voice cloning
Retell AI✓
Synthflow AI✓
Inbound reception and ivr routing replacement
Retell AI✓
Synthflow AI✓
Outbound dialing and campaign management
Retell AI✓
Synthflow AI✓
Post call transcription and CRM sync
Retell AI✓
Synthflow AI✓
Voicemail detection and answering machine drops
Retell AI✓
Synthflow AI✓
Twilio vonage bring your own carrier byoc support
Retell AI✓
Synthflow AI✓
SOC2 type ii
Retell AI✓
Synthflow AI-
HIPAA compliance for medical appointment setting
Retell AI✓
Synthflow AI✓
Pricing model
Retell AIPer minute usage based
Synthflow AIFlat monthly

What each one is

The product in its own terms, so the numbers below have context.

Retell AI

Leader

An AI voice platform that handles phone calls autonomously, managing appointment booking, order status checks, lead qualification, and customer service interactions. It integrates with existing CRM systems and telephony infrastructure to maintain customer context and automatically log outcomes.

Independently observed

Synthflow AI

A cloud-based platform that deploys AI agents to handle incoming and outgoing phone calls, customer support interactions, and lead qualification. It operates on dedicated telephony infrastructure, integrates with existing enterprise systems, and offers multilingual support, custom voice options, and compliance certifications for regulated industries.

Independently observed

Pricing

List pricing as published by each vendor, with the date we read it. Always verify at the source before you buy.

Retell AI

Leader
from $2/moUsage-basedFree tier

From $0.07–$0.31/minute for AI voice agents. $10 free credit. Enterprise plans available with HIPAA and SOC2 Type II compliance.

  • Pay-as-you-go$0.07–$0.31/minute for AI voice agents; $0.002+/message for chat agents. $10 free credit on signup.
    • Voice agents for inbound/outbound calls
    • Call transfer and routing
    • CRM integration (Salesforce, HubSpot)
    • Post-call transcription and logging
    • Custom LLM models
    • +4 more
  • EnterpriseContact sales
    • HIPAA/BAA compliance
    • Single Sign-On (SSO)
    • Custom MSA agreement
    • Custom Data Processing Agreement (DPA)
    • Dedicated concurrency allocation
    • +1 more
as of verify ↗

Synthflow AI

from $29/moSubscription14-day trial

From $29/month with 14-day free trial. Pay-as-you-go minutes available.

  • Starter$29/month
  • Pro$450/month
  • Growth$900/month
  • Agency$1,400/month
as of verify ↗

Platform & deployment

Where each product runs and how it can be hosted. A dash means undocumented, not unsupported.

Platforms
Web
Retell AI✓
Synthflow AI✓
iOS
Retell AI✓
Synthflow AI✗
Android
Retell AI✓
Synthflow AI✗
CLI
Retell AI✓
Synthflow AI✗
Deployment
Cloud / SaaS
Retell AI✓
Synthflow AI✓

Integrations

What each product connects to. Counts come from the vendor's own integration directory where one exists.

In common (13)
  • Twilio
  • Vonage
  • Telnyx
  • Salesforce
  • HubSpot
  • Zapier
  • n8n
  • Make
  • RingCentral
  • ServiceTitan
  • Go High Level
  • Monday.com
  • OpenAI

Retell AI

Leader
34 total - 21 not shared
  • Zoho CRM
  • viaSocket
  • Zendesk
  • Talkdesk
  • Nice
  • Workable
  • OpenDental
  • Slack
  • Smartsheets
  • Shopify
  • Stripe
  • Xero
  • Supabase
  • Webflow
  • WhatsApp
  • ElevenLabs
  • Minimax
  • Fish Audio
  • Cartesia
  • Google Gemini
  • Anthropic Claude
Independently observed

Synthflow AI

50 total - 37 not shared
  • 8x8
  • Freshworks
  • Cal.com
  • Google Calendar
  • Microsoft Calendar
  • Five9
  • Genesys
  • OpenPhone
  • Dialpad
  • 3CX
  • JustCall
  • Cloudtalk
  • Cisco
  • Avaya
  • Intermedia
  • Zoho
  • ActiveCampaign
  • Pipedrive
  • Jobber
  • Follow Up Boss
  • Housecall Pro
  • Dentrix
  • Velocify
  • Practice Better
  • +13 more
Independently observed

Comparison generated from independently-sourced facts. Every value links to its source and retrieval date. See the method.