vioscaleAI
Comparison

Retell AI vs Synthflow AI

On the evidence we track, Retell AI leads this comparison with a composite score of 79/100. 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 formatsMarkdownJSONGraphQLMarkdown is open. JSON and GraphQL need a free key.
★Retell AI79
Synthflow AI67
Score
vioscaleAI score
Retell AI79 / 100medium · 72%
Synthflow AI67 / 100medium · 74%
Pricing
Free tier
Retell AI✓
Synthflow AI✗
Model
Retell AIfreemium
Synthflow AIcommercial
Price level
Retell AIlow
Synthflow AImid
Starting price
Retell AI$0.00
Synthflow AI$29
Transparent
Retell AI✓
Synthflow AI✓
Integrations
Count
Retell AI1,000
Synthflow AI200
Security
Certifications
Gdpr
Retell AI✓
Synthflow AI✓
Hipaa
Retell AI✓
Synthflow AI✓
Iso27001
Retell AI✓
Synthflow AI–
Pci
Retell AI–
Synthflow AI✓
Soc2
Retell AI✓
Synthflow AI✓
Trust center
Reliability
Sla pct
Retell AI99.9
Synthflow AI99.99
Market
Availability
Content
Faq
Retell AI7 items
Synthflow AI7 items

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

A cloud-based platform that deploys conversational AI agents to handle inbound and outbound phone calls, including lead qualification, appointment booking, call routing, and CRM integration.

Independently observed

Synthflow AI

A no-code platform for building and deploying AI voice agents that handle customer calls, scheduling, and support at enterprise scale. Includes compliance certifications and integrations with existing business systems.

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 $0.00/messageUsage-basedFree tier

From $0.07/min usage-based pricing. Free tier with $10 credits.

  • Pay-as-you-go$0.07–$0.31/min for voice agents; $0.002+/msg for chat agents
    • 20 concurrent calls included
    • Full platform access
    • Drag-and-drop agent builder
    • Call transfers and routing
    • CRM integration
    • +1 more
  • EnterpriseContact sales
    • Unlimited concurrent calls
    • HIPAA/BAA compliance
    • SSO
    • Custom MSA
    • Custom DPA
    • +3 more
as of verify ↗

Synthflow AI

from $29/moSubscription14-day trial

From $29/mo. 14-day free trial.

  • Starter$29/mo
  • Pro$450/mo
  • Growth$900/mo
  • Agency$1400/mo
  • CustomContact sales
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✓
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 (18)
  • Twilio
  • Vonage
  • Telnyx
  • Salesforce
  • HubSpot
  • Zapier
  • n8n
  • Make
  • RingCentral
  • ServiceTitan
  • Go High Level
  • Monday.com
  • OpenAI
  • Pipedrive
  • GoHighLevel
  • Cal.com
  • Avaya
  • Genesys

Retell AI

Leader
48 total - 30 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
  • Keap
  • Calendly
  • Google Drive
  • +6 more
Independently observed

Synthflow AI

51 total - 34 not shared
  • 8x8
  • Freshworks
  • Google Calendar
  • Microsoft Calendar
  • Five9
  • OpenPhone
  • Dialpad
  • 3CX
  • JustCall
  • Cloudtalk
  • Cisco
  • Intermedia
  • Zoho
  • ActiveCampaign
  • Jobber
  • Follow Up Boss
  • Housecall Pro
  • Dentrix
  • Velocify
  • Practice Better
  • Bravity
  • Bitrix24
  • AthenaOne
  • Clay
  • +10 more
Independently observed
Still deciding?

Retell AI or Synthflow AI: which one depends on you

A composite score cannot know your constraints. Describe them and both get re-weighted against what you actually need, with the evidence behind every position.

Free to run, no account needed to start. How the evaluation works

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