synthflow.md
name: Synthflow slug: synthflow website: https://synthflow.ai/ type: commercial track: users category: voice-ai-agents subcategory: voice-agents status: active description: Enterprise voice AI platform with in-house telephony for automating phone calls at scale with sub-100ms latency and HIPAA compliance pricing_model: usage-based founded_year: 2023 headquarters: San Francisco, CA last_verified: ‘2026-06-09’ confidence_score: 0.95 —
Overview
Synthflow is an enterprise-focused voice AI platform that claims to be "the only end-to-end Voice AI platform with in-house telephony." The platform has processed 65M+ customer calls and saved clients 4M+ hours through automated phone conversations. Synthflow specializes in sub-100ms latency voice agents for appointment scheduling, lead qualification, customer support, and outbound campaigns. Backed by Accel, the platform offers enterprise-grade security (HIPAA, SOC 2, PCI DSS, GDPR compliance), 50+ language support with regional accents, and integrations with 200+ platforms including HubSpot, Salesforce, and GoHighLevel. Notable results include 35% increase in answered calls for customers.
The Verdict
Who Should Use Synthflow?
Best For
- Agencies building voice AI for clients
- Healthcare organizations (HIPAA compliant)
- High-volume call centers needing scale
- Teams wanting fastest possible latency
- Businesses needing 50+ language support
- Enterprises requiring compliance certifications
Not Ideal For
- Small businesses with low call volume
- Teams wanting pre-built vertical solutions
- Developers preferring API-first approach
- Budget-constrained startups
What's Great
- Industry-leading sub-100ms latency
- End-to-end platform with in-house telephony
- 65M+ calls processed—proven at scale
- 50+ languages with regional accents
- Full compliance stack (HIPAA, SOC 2, PCI, GDPR)
- 99.99% uptime guarantee
- Free to build—pay only for calls made
- 200+ native integrations
Watch Out For
- Pay-as-you-go can be expensive at scale
- Learning curve for complex workflows
- Enterprise features require higher tiers
- Less developer documentation than competitors
- Newer platform with less market track record
Pricing
View all features & details
Voice Agent Features
- Sub-100ms response latency
- Inbound and outbound calls
- Voicemail detection
- Call routing and transfer
- SMS follow-ups
- Voice cloning capabilities
BELL Framework
- Build - Visual flow designer
- Evaluate - Test and optimize
- Launch - Deploy to production
- Learn - Continuous improvement
- Custom agent creation
- Template library
Languages
- 50+ languages supported
- Regional accents
- Multilingual conversations
- Language detection
- Native pronunciation
- Cultural adaptation
Integrations
- GoHighLevel
- HubSpot
- Salesforce
- 200+ platforms via Zapier
- CRM/ERP systems
- Custom API webhooks
Use Cases
- Appointment scheduling
- Lead qualification
- Customer support
- Outbound campaigns
- Surveys and feedback
- Collections follow-up
Compliance
- HIPAA compliant
- SOC 2 certified
- PCI DSS compliant
- GDPR compliant
- 99.99% uptime SLA
- Data encryption
How It Compares
| Feature | Synthflow | Retell AI | Voiceflow | Bland AI |
|---|---|---|---|---|
| Latency | <100ms | ~600ms | ~500ms | Good |
| In-house Telephony | Yes | Twilio-based | Varies | Yes |
| Languages | 50+ | Limited | Multiple | Multiple |
| HIPAA | Yes | Enterprise | Enterprise | Enterprise |
| Free Builder | Yes | $10 credit | Yes | Trial |
| Best For | Agencies | Healthcare | No-code | Scale |