Synthflow

No-code AI voice agents for calls

Hand-reviewed by the Toolglade team·Updated Aug 2026

chatbots#voice-agents#ai-phone-calls#no-code#conversational-ai

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Toolglade’s take

Synthflow is worth a look if you want to build AI phone agents without heavy coding, especially for agencies and white-label scenarios. The no-code builder lowers the barrier versus developer-first rivals like Bland or Vapi. The important caveat is cost: with the pay-as-you-go, bring-your-own-provider model, the advertised per-minute rate can understate real spend once ElevenLabs, OpenAI, and telephony are added, and self-serve tiers have narrowed toward enterprise contracts. Model total cost, including third-party AI providers, before committing.

About Synthflow

Synthflow is a no-code platform for building AI voice agents that handle inbound and outbound phone calls, aimed at businesses and agencies. It offers a visual call-flow builder, CRM and calendar integrations, and a bring-your-own-provider model for voice, LLM, and telephony. Originally SME-focused, it has moved toward enterprise contracts and pay-as-you-go pricing. Backed by a $20M Series A led by Accel, it competes with Bland AI, Vapi, and Retell.

Synthflow lets businesses build AI voice assistants that answer and place phone calls, positioned around a no-code visual builder so non-developers can create call flows, connect a knowledge base, and integrate with CRMs and tools. Use cases include appointment booking, lead qualification, customer support, and after-hours answering. Originally aimed at SMEs and agencies with self-serve tiered plans, Synthflow has moved upmarket toward enterprise contracts and a component-based pay-as-you-go model, where you choose your voice engine, LLM, and telephony provider. This gives flexibility but means the advertised per-minute rate often understates real cost once third-party providers are added. Synthflow has raised meaningful venture funding, including a Series A led by Accel. It competes with Bland AI, Vapi, Retell, and similar platforms; its differentiation is the no-code builder and agency/white-label orientation, versus more developer-first rivals. Businesses should model total cost including the underlying AI providers before committing.

TL;DR

Synthflow is a no-code platform for building AI voice agents that handle inbound and outbound phone calls, aimed at businesses and agencies. It offers a visual builder, CRM and calendar integrations, and a bring-your-own-provider model for voice, LLM, and telephony. It has moved from SME self-serve tiers toward enterprise contracts and pay-as-you-go pricing. Backed by a $20M Series A led by Accel, it competes with Bland AI, Vapi, and Retell.

Company overview

Synthflow AI builds no-code AI voice agents, initially targeting small and medium businesses and agencies before expanding toward enterprise. It emphasizes ease of building call flows without deep engineering.

The company has grown quickly on the back of venture funding and positions itself in the enterprise conversational-AI voice market.

Product features

Synthflow provides a no-code visual builder for call flows, knowledge-base and CRM/calendar integrations, and a component-based model where users select their own voice engine, LLM, and telephony provider. It supports inbound and outbound calls, analytics, and white-label/agency use.

Pricing has shifted to pay-as-you-go and enterprise contracts, trading fixed monthly simplicity for flexibility and total-cost complexity.

Target market

Agencies, SMBs, and enterprises that want to deploy AI voice agents for calls without building a fully code-first stack.

Buyer personas

End users

Operations, support, and sales staff whose calls the agents handle, plus agency builders configuring them.

Buyers

SMB owners, agency operators, and enterprise operations leaders.

Key influencers

RevOps, IT, and CX managers evaluating voice automation.

Ideal customer profile

An agency or business that wants to build and deploy AI voice agents with minimal coding, values integrations and white-labeling, and can manage or budget for the underlying third-party AI providers.

Funding & performance

Synthflow has raised roughly $30M total, including a $20M Series A in June 2025 led by Accel, following an earlier $7.4M seed round.

Pros & cons

Pros

No-code visual builder for non-developers
Strong CRM, calendar, and tool integrations
Agency and white-label orientation
Flexible bring-your-own-provider model
Well funded with Accel-led Series A
Handles both inbound and outbound calls

Cons

Advertised per-minute rate understates real cost with add-ons
Managing separate provider accounts adds complexity
Self-serve tiers have narrowed toward enterprise contracts
Total cost can reach $1,600-2,000+/month for agencies
Pricing model changed, causing confusion
Enterprise commitments can be steep

Pricing plans

Pay-as-you-go

$0.13-0.24/min

No-code builder
Bring-your-own voice/LLM/telephony
CRM and calendar integrations
Inbound and outbound calls

Agency

$1,400+ / month

White-label deployments
Multiple client agents
Plus BYOK provider costs
Priority support

Enterprise

Custom (from ~$30k/yr)

Committed annual contract
Advanced security and SLA
Dedicated support
Custom integrations

Key features

API

Team collaboration

Multi-language

Integrations

CRM connectors, Calendar/booking, Telephony providers, ElevenLabs/OpenAI/Deepgram (BYOK), Zapier

Input types

voice, text, api

Output types

voice, call-data

Best For

no-code voice agents, appointment booking, lead qualification calls, agency/white-label deployments

Compare key features

View all alternatives →

Feature

Synthflow

Bland AI

PolyAI

Pricing

Paid

Free plan

Free trial

Yes

API

Yes

Team support

Yes

Frequently asked questions

What is Synthflow?+

It is a no-code platform for building AI voice agents that answer and place phone calls, aimed at businesses and agencies for tasks like booking, lead qualification, and support.

Do I need to be a developer to use Synthflow?+

No. Synthflow's main draw is a no-code visual builder, though connecting providers and integrations still requires some technical comfort.

How much does Synthflow really cost?+

It uses a pay-as-you-go model around $0.13-0.24/minute all-in, plus enterprise contracts reported to start near $30,000/year. Because you bring your own voice, LLM, and telephony providers, real cost is often 2-3x the headline rate.

Does Synthflow still have cheap monthly plans?+

Legacy self-serve tiers like a ~$29/month Starter have largely been withdrawn for new users, with pricing moving toward pay-as-you-go and enterprise contracts.

How does Synthflow compare to Bland AI?+

Synthflow emphasizes a no-code builder and agency/white-label use, while Bland is more developer-first with bundled telephony. Compare on build model, integration fit, and total cost.