Synthflow AI
PaidNo-code voice AI agent platform for automating inbound and outbound phone calls
What is Synthflow AI?
Synthflow AI is a no-code platform for building and deploying AI-powered voice agents that handle real phone calls -- both inbound and outbound. Founded in 2023, Synthflow has carved out a niche in the voice AI agent space by making it possible for non-technical users to create phone agents that can book appointments, qualify leads, handle customer support, send follow-up messages, and transfer calls to human agents when needed. The platform uses leading TTS providers (ElevenLabs, PlayHT) for natural-sounding voices and supports real-time calendar booking during live calls. Synthflow targets three main audiences: SMBs wanting to automate phone handling, agencies reselling white-labeled voice agents to clients, and enterprises needing scalable phone automation. Key integrations include HubSpot, Salesforce, GoHighLevel, Zapier, and Make. Unlike general-purpose automation tools like n8n or Lindy AI, Synthflow is laser-focused on voice -- it does not automate email, chat, or workflow triggers outside of phone calls. This specialization is both its strength (the voice UX is polished) and its limitation (you will need other tools for non-voice automation). Pricing is now enterprise only: contracts start at $30,000/year, scoped by call volume, concurrency, and integrations, with pay as you go billing for the calls conducted. There is no self-serve plan, which is a notable barrier to entry compared to competitors.
Synthflow AI demo video
Watch Synthflow AI's official demo to see Synthflow AI in action before reading our full review.
Official video by Synthflow AI via YouTube, embedded for reference. ToolChase does not host or claim this video.
⚡ Quick Verdict
Agencies and SMBs wanting no-code AI phone agents for appointment booking, lead qualification, and support
Teams needing general workflow automation, email agents, or low-cost voice AI at scale
Enterprise contracts from $30,000/year, scoped by call volume
No free plan; building an agent is free, running calls is paid
Polished no-code builder for voice agents with real-time booking and agency white-labeling
Voice-only -- no email, chat, or workflow automation outside of phone calls
Bottom line: Synthflow AI scores 4.2/5 -- the best no-code voice AI builder for agencies and SMBs who want phone agents without writing code. The lack of a free tier and voice-only focus keep it from scoring higher.
Pricing
Enterprise pricing only. Synthflow removed its self-serve tiers (formerly Starter, Pro, Growth, and Agency) and now sells annual enterprise contracts.
Enterprise, from $30,000/year: Final pricing is scoped around call volume, concurrency, telephony setup, integrations, security needs, and launch support. Contracts include SLA support, custom telephony options, security review, and implementation support.
Usage billing: Pay as you go for the actual calls and chats conducted. Building an agent, designing flows, and configuring integrations is free before launch.
Key Features
- No-code voice AI agent builder with visual flow editor
- Inbound and outbound phone call automation
- Real-time appointment booking during live calls (Google Calendar, Calendly)
- Human call transfer with context handoff
- Native CRM integrations: HubSpot, Salesforce, GoHighLevel, Zoho
- White-label and sub-accounts for agencies
- Rebilling system -- agencies set their own per-minute rates for clients
- Multi-language support with ElevenLabs and PlayHT voice synthesis
- Voicemail detection and after-hours call handling
- Zapier and Make integrations for workflow triggers
Pros & Cons
Pros
- Best no-code UX for building voice AI agents -- no engineering needed
- Real-time booking during calls is a standout feature for appointment-heavy businesses
- Strong agency features: white-labeling, sub-accounts, rebilling
- GoHighLevel integration makes it ideal for marketing agencies
- Natural-sounding voices via ElevenLabs with sub-second latency
Cons
- No free plan and no self-serve tier; enterprise contracts start at $30,000/year
- Voice-only platform -- no email, chat, or general workflow automation
- Quote-scoped pricing means budgeting requires a sales conversation
- Per-minute costs add up quickly for high-volume deployments
- The $30,000/year entry point locks out the small teams that self-serve rivals still welcome
FAQ
How much does Synthflow AI cost?
Synthflow no longer sells self-serve tiers. As of August 2026 its pricing page lists enterprise contracts starting at $30,000 annually, with final pricing scoped around call volume, concurrency, telephony setup, integrations, security needs, and launch support. Billing is pay as you go, so you pay for the actual calls and chats conducted. The former Starter, Pro, Growth, and Agency tiers are no longer offered.
Does Synthflow AI have a free plan?
Synthflow has no free plan and no self-serve tier. You can build and configure an AI agent for free before launching, but running calls requires an enterprise contract, and the pricing page says contracts start at $30,000 annually. This is a significant barrier compared to competitors like n8n and Make, which offer free tiers. If you need to test voice AI before committing, platforms like Bland AI or Vapi offer more accessible entry points.
What is Synthflow AI used for?
Synthflow is a no-code platform for building AI-powered voice agents that handle phone calls. Common use cases include appointment scheduling, lead qualification, customer support calls, outbound sales follow-ups, payment reminders, and after-hours call handling. The AI agents can book meetings in real-time, transfer calls to humans, and integrate with CRMs like HubSpot and Salesforce.
How does Synthflow compare to Bland AI?
Both are voice AI platforms, but they target different users. Synthflow focuses on no-code simplicity with a visual builder and pre-built templates -- ideal for agencies and SMBs. Bland AI is more developer-oriented with API-first pricing and deeper customization. Synthflow's per-minute pricing is higher, but the no-code builder saves engineering time. Bland AI wins on raw cost per minute for high-volume deployments.
Can Synthflow integrate with my CRM?
Yes. Synthflow integrates natively with HubSpot, Salesforce, GoHighLevel, and Zoho CRM. It also connects to Zapier, Make, and webhook endpoints for custom integrations. The Pro plan and above include full CRM access. On Starter, integrations are limited to API and basic webhook connections.
Is Synthflow good for agencies?
Yes -- Synthflow is one of the few voice AI platforms with explicit agency support. White-labeling and sub-accounts remain part of the agency offering; since Synthflow moved to enterprise pricing, agency deals are scoped as contracts starting at $30,000 annually. Agencies can resell Synthflow-powered voice agents to clients with custom branding. The rebilling feature lets agencies set their own per-minute rates. GoHighLevel integration is a big draw for marketing agencies already on that stack.
What voice quality does Synthflow use?
Synthflow uses leading text-to-speech providers including ElevenLabs and PlayHT for natural-sounding voices. The platform supports multiple languages and voice cloning on higher-tier plans. Latency is typically under 1 second for responses, which feels natural in conversation. Voice quality is competitive with Bland AI and Retell AI, though dedicated TTS platforms like ElevenLabs still sound slightly more natural in side-by-side comparisons.
📋 Good to know
Sign up at synthflow.ai, build your first voice agent with the visual flow editor for free, then work with the Synthflow team on an enterprise contract to connect a phone number and launch calls.
GDPR compliant, SOC 2 in progress. Call recordings stored encrypted. Enterprise customers can negotiate data residency requirements.
There are no self-serve tiers to move between; contracts start at $30,000/year and the final quote scales with call volume, concurrency, and integration scope, so revisit your agreement as usage grows.
Low for basic call flows. The visual builder abstracts most complexity. Advanced features like conditional branching and CRM field mapping take a few hours to learn.
