Retell AI
VS Synthflow
Data as of 03/2026Searching for a Synthflow AI Alternative?
While Synthflow has gained traction for multilingual AI call agents, many businesses quickly discover limits in scalability, pricing transparency, and enterprise readiness.
Retell AI delivers lower per-minute rates, more flexible plans, and advanced capabilities, like verified numbers, knowledge base integration, and compliance built-in.
For companies under pressure to cut costs without compromising customer experience, Retell is the clear alternative to Synthflow AI.
Overview
The Enterprise-Ready Alternative to Synthflow AI
Scaling AI voice agents demands more than a fast builder—you need a platform that handles complexity and grows without hitting capability limits.
Retell AI
Stats that Matter
The Retell AI Advantage
Retell AI is built for production, not just prototyping. Our infrastructure delivers measurable results for enterprise clients, with the reliability and scale your business depends on.
80
%
faster deployment for enterprise clients at SWTCH energy
60
%
improvement in agent satisfaction (internal surveys)
99.
99%
uptime across all plans
Features, Pricing and Compliance
Feature, Pricing & Compliance Breakdown
Synthflow's no-code builder is fast to launch but hits a ceiling on customization and analytics. Retell scales further—with custom LLM support, post-call analysis, lower per-minute rates, and automatic PII redaction included.
| Features |  | .avif) |
|---|---|---|
| Drag & Drop | Low/no code capabilities | No-code capabilities |
| LLM Model & Intelligence | Always integrates the newest LLMs | Supported but limited customizability |
| Custom LLM Integration | Supported | Not Supported |
| Custom Telephony | Native SIP Trunking | Supported |
| Warm Transfer | Supported | Not Supported |
| Multilingual | 30+ Languages Supported | Supported |
| Preset Functions | Supported | Supported |
| Branded Calls | Supported | Not Supported |
| IVR & DTMF Support | IVR with DTMF tone recognition | Supported |
| Post-Call Analytics | Real-Time Insights | Not Supported |
| Simulation Testing | Real-Time Insights | Not Supported |
| Voice & Audio Quality | Excellent | Varies based on quality upgrades |
| Latency | Sub-second Latency | Sub-second Latency |
| Pricing | | |
|---|---|---|
| Voice AI | $0.07/min | $0.18-$0.22/minute + $0.13/min after monthly minute limit |
| Phone Number | $2.00/month | Included |
| Toll Phone Number | $5.00/month | Not Supported |
| Verified Phone Number | Included at no extra cost | Included |
| Branded Calls | Included at no extra cost | Limited |
| Batch Calls | Included at no extra cost | Not Supported |
| Extra Knowledge Base Slots | Included at no extra cost | Limited |
| Concurrency Add-on | Included at no extra cost | Limited |
| Speech-to-Text | Included at no extra cost | Included |
| Enterprise-Grade | | |
|---|---|---|
| Compliance | HIPAA, SOC2 Type 1 & 2, GDPR | HIPAA, SOC2 Type 1 & 2, GDPR |
| Rate Limit | No rate limit | 10 - 100+ depending on plan |
| Uptime to date | 99.99% | Unknown |
| Onboarding | Ready to deploy with intuitive setup | Adequate |
| PII Redaction | Automatic redaction of names, addresses, DOBs, passwords, and PINs | Not Supported |
Revolutionize your call operation with Retell
