Synthflow vs Retell AI

Detailed side-by-side comparison to help you choose the right tool

Synthflow

🟢No Code

Voice AI

No-code platform for building voice AI agents that make and answer phone calls, with a drag-and-drop call-flow editor and starting price as low as $0.02/min.

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Starting Price

Custom
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Retell AI

🟡Low Code

Voice AI

Retell AI is an end-to-end platform for building, deploying and monitoring voice AI agents that handle phone calls at production scale.

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Starting Price

$0.07/min
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Feature Comparison

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FeatureSynthflowRetell AI
CategoryVoice AIVoice AI
Pricing Plans8 tiers76 tiers
Starting Price$0.07/min
Key Features
  • • Proprietary BELL Deployment Framework (Build, Evaluate, Launch, Learn)
  • • Ultra-low latency in-house telephony (<100ms)
  • • HIPAA, SOC 2, and PCI DSS Compliance
  • • Latency-tuned conversational engine with natural turn-taking and interruption handling
  • • No-code conversation flow editor plus full SDK access
  • • Phone-number provisioning in 50+ countries with bring-your-own carrier

💡 Our Take

Choose Synthflow for enterprise compliance certifications, the BELL deployment methodology, and broader CRM/ERP integrations out of the box. Choose Retell AI if you're a smaller team or developer prioritizing fast voice latency, transparent per-minute pricing, and a leaner API surface without enterprise overhead.

Synthflow - Pros & Cons

Pros

  • ✓Genuinely no-code — non-engineers can ship an agent in an afternoon
  • ✓Per-minute pricing is among the lowest in the category at $0.02
  • ✓Strong agency features: white-label, sub-accounts, reseller-friendly
  • ✓200+ integrations remove most custom dev work
  • ✓Multilingual coverage is good for non-English markets

Cons

  • ✗Complex multi-turn logic gets clunky inside a visual builder
  • ✗Less programmable than developer-first platforms like Vapi
  • ✗Concurrency add-on cost ($20/line) adds up fast for high-volume
  • ✗Voice quality on cheapest tier is noticeably synthetic
  • ✗Enterprise plan minimum (~$2,000/mo) is a steep step up from Pro

Retell AI - Pros & Cons

Pros

  • ✓Compliance posture (SOC 2 Type II, HIPAA, PCI) is genuinely turnkey for regulated industries.
  • ✓No-code flow editor lets ops teams own the agent without engineering tickets.
  • ✓Latency tuning is audibly better than rolling your own STT-LLM-TTS pipeline.

Cons

  • ✗Per-minute pricing can spike on unbounded outbound campaigns without budget caps.
  • ✗Knowledge base ingestion is simpler than dedicated RAG platforms.
  • ✗Deep customisation still requires the SDK and engineering work.

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🔒 Security & Compliance Comparison

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Security FeatureSynthflowRetell AI
SOC2—✅ Yes
GDPR—✅ Yes
HIPAA—✅ Yes
SSO—🏢 Enterprise
Self-Hosted—❌ No
On-Prem—❌ No
RBAC—🏢 Enterprise
Audit Log—🏢 Enterprise
Open Source—❌ No
API Key Auth—✅ Yes
Encryption at Rest—✅ Yes
Encryption in Transit—✅ Yes
Data Residency——
Data Retention—configurable
🦞

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Read the full reviews to make an informed decision

Review SynthflowReview Retell AI