Synthflow Review 2025 : Pros, Cons, Pricing and Features

Synthflow users consistently praise the platform for being intuitive, reliable, and easy to navigate. Many appreciate its rich features, quick agent deployment, and smooth integration with various systems. However, some Reddit users have voiced concerns “Synthflow rates aren't accurate, they hit me with a bait and switch after I paid for the ‘$29/month’ services.” Another user shared, “For context, I ran a small outbound campaign (about 200 calls). Results were: Synthflow - a few scheduled callbacks, ~9% conversion.”

In this detailed Synthflow Review blog, we explore hands-on insights from 2025 users and automation experts, and also compare Synthflow with Dograh AI, an open-source, scalable alternative for building advanced voice automation solutions.

What is Synthflow ?

Synthflow was founded in 2023, is a no code voice ai platform that automates phone calls using voice ai agents. It is designed for both inbound and outbound calling, handling everything from appointment booking and lead qualification to customer support. But Synthflow relies on old technology offering a single agent bot - thus making it inherently prone to hallucinations and mistakes. Synthflow is best suited for smaller and multilingual use cases.

Key Features :

• No Code Builder
• Human-Like, Low Latency Voice
• Multilingual Support
• Text-to-Speech (TTS) and advanced transcription features
• CRM Integration - HubSpot , Highlevel and Zapier
• Workflow Automation, inbound calling, outbound calling, and lead qualification
• Dedicated Customer Support

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The Pros and Cons of Synthflow

Pros : 

1. No-Code, Visual Build Platform: Synthflow offers a drag-and-drop interface that lets anyone, even non-technical users, build, test, and launch AI voice agents in just hours.
2. Fast Deployment: Launch AI voice agents in under 3 weeks using no-code tools, flexible APIs, and ready-to-use templates, no engineers needed.
3. Human-Like Voice Quality: Powered by ElevenLabs, Synthflow claims latency under 500ms delivers expressive, natural-sounding voices, for smooth real-time interactions.
4. Multilingual Support: Synthflow supports 30+ languages and regional accents, allowing users to customize vocabulary and tone for global reach and branding.
5. Comprehensive Integrations: Synthflow integrates with 200+ apps, including CRM, calendar, telephony, helpdesk etc enabling seamless workflow automation without replacing existing systems.
6. Security and Compliance: Synthflow is SOC2, HIPAA, and GDPR-compliant, with PCI DSS support, ensuring secure workflows for payments and account verification.
7. Strict Guardrails, No Hallucinations: AI uses approved knowledge sources to deliver accurate, brand-safe responses with no off-script guesses.
8. 24/7 Availability: Voice AI agents operate around the clock, handling calls after hours without the need for night shifts or weekend staff.
9. Dedicated Support: AI engineers, telephony specialists, solution architects and customer success managers ensure every voice agent is reliable and fully operational.
10. Consistent Quality: AI delivers the same reliable responses every time, with no fatigue, mood swings, or errors between shifts.

Cons :

1. Synthflow Test Call Error: A Reddit user reported, "When I go to test the call, the call will be successful with the target phone number, but when I try a different target phone number it gives me an error."
2. Slow Tech Support: Users report that tech support can take over 24 hours to respond, and replies often come with more questions rather than solutions. One user shared, "I went through this loop twice before finally closing my account."
3. Persistent Synthflow Branding: Despite promises, Synthflow’s logos and branding continue to appear across the platform, including on client-facing interfaces.
4. Support Tickets Redirected to Synthflow: When clients submitted support tickets via the branded platform, they were redirected to Synthflow’s support channels, compromising the white-label experience.
5. Challenging User Interface: The interface feels outdated and can be difficult to navigate, making the user experience cumbersome.
6. High Pricing: Synthflow is on the expensive side, which may impact affordability, ensuring it fits within your budget before committing.
7. LoopTalk: Does not include built-in autonomous testing, requiring users to rely on manual checks for validation.
8. Not Open Source: It operates on a proprietary model, with its source code, workflow engine, and APIs unavailable for public modification or deployment.
9. Prompt Engineering Requires Skill: Creating advanced conversational flows with strong fallback logic demands well-crafted prompts, which can be challenging for beginners.
10. Debugging and Testing Complexity: Testing complex flows and prompt outcomes across all scenarios often requires significant manual effort.

Synthflow Pricing

Synthflow offers Starter, Pro, Growth, Agency, and Enterprise plans with a free 14-day trial. Overage rates apply after included minutes, ranging from $0.12–$0.13 per minute on Pro, Growth and Agency plans.

Core Pricing Structure Yearly

• Starter : Starter Plan ($29/mo) includes 50 minutes, 5 concurrent calls, Voice API, LLM and transcriber costs, unlimited assistants, API integrations, real-time booking, human transfer, and more. Access Voice AI courses, community support, and get a new phone number for $1.50.
• Pro : Pro Plan ($375/mo) ideal for businesses with low call volumes. Includes 2,000 minutes (then $0.13/min), 25 concurrent calls, 8,000 custom workflows, everything in Starter, workflow builder, team access, and ticket-based support. Extra concurrent calls cost $7 each.
• Growth : Growth Plan ($750/mo) designed for businesses with higher call volumes. Includes 4,000 minutes (then $0.12/min), 50 concurrent calls, 42,000 custom workflows, and 25 subaccounts. Offers everything in Pro plus rebilling, early access to new features, and ticket-based support. Extra concurrent calls cost $7 each.
• Agency : Agency Plan ($1,250/mo) a white-label solution for agencies and resellers. Includes 6,000 minutes (then $0.12/min), 80 concurrent calls, 100,000 custom workflows, and unlimited subaccounts. Offers a fully white-labeled platform, 30-day onboarding, a private Slack channel, and ticket-based support. Extra concurrent calls cost $7 each.
• Enterprise : Enterprise Plan (Custom Pricing) built for top-tier performance, scalability, and support. Offers volume-based rates as low as $0.08/min, SIP trunk integration, guaranteed uptime (SLA), custom integrations, and 200+ concurrent calls. Includes full compliance (SOC2, HIPAA, GDPR), a dedicated solution architect, and enterprise-level onboarding, training, and support. Extra concurrent call pricing is custom.

Cost Estimate :

Synthflow Pro Plan - Cost Estimate, includes 2,000 minutes, 8,000 workflows, 25 concurrent calls, workflow builder, and team access with ticket-based support. Pricing: $0.13/min + $0.002 per workflow + $7 per concurrent call, totaling $375/month.

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Synthflow Usability and Interface

With Synthflow user friendly interface, you can create AI-powered voice agents to automate and improve business communications across industries. Key use cases include:

What You’ll Build with Synthflow :

• Customer Support: Handle common issues, answer questions, and provide 24/7 assistance, freeing agents to focus on complex cases.
• Call Centers: Handle peak call volumes, cut wait times, and boost first-call resolution, scaling support without expanding your team.
• Appointment Scheduling: Automate booking, rescheduling, and calendar management while sending reminders to reduce no-shows and ease staff workload.
• Sales: Automate outbound calls, qualify prospects, and deliver high-intent leads to your team, boosting pipeline without adding headcount.
• Healthcare: Automate patient intake, reminders, and follow-ups via voice, enhancing access while maintaining efficiency and security.
• Banking: Automate account updates, transaction details, and real-time fraud alerts, delivering secure and reliable voice interactions for customers.

Limitations :

• Synthflow Test Call Error: A Reddit user reported, "When I go to test the call, the call will be successful with the target phone number, but when I try a different target phone number it gives me an error."
• Slow Tech Support: Users report that tech support can take over 24 hours to respond, and replies often come with more questions rather than solutions. One user shared, "I went through this loop twice before finally closing my account."
• Persistent Synthflow Branding: Despite promises, Synthflow’s logos and branding continue to appear across the platform, including on client-facing interfaces.

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Synthflow Voice Quality and Latency

Synthflow’s Voice Configuration lets you fully customize your AI agent’s voice and behavior for natural, engaging interactions. Allow users to choose the language, select or clone a voice, and fine-tune details like timing, expressiveness, and stability. With Voice Prompting, users can adjust tone, pacing, and emotion to match any context. Enjoy multilingual, low-latency conversations with clear, reliable responses and guaranteed uptime.

Synthflow Developer Capabilities

Synthflow offers powerful developer features designed for ease of use, flexible integrations, and seamless workflow automation.

• No-Code Visual Builder : Both developers and non-technical users can design and launch custom AI voice agents through an intuitive drag-and-drop interface, enabling rapid call flow creation without any coding.
• API and Custom Actions : Synthflow provides a REST API for seamless interaction with AI models through JSON, while custom actions enable dynamic call flows and automated workflows integrated with external systems.
• CRM Integrations : Synthflow integrates with leading CRMs (HubSpot, GoHighLevel), workflow platforms (Zapier, Make, Bubble, Cal.com), payment solutions (Stripe), and AI tools (ElevenLabs, OpenAI).
• Telephony Integrations : Telephony integration covers SIP trunking, Twilio, Telnyx, RingCentral, and on-premise PBX systems, available mainly with enterprise plans.
• Voice and Conversation Tuning : Synthflow offers ElevenLabs integration for branded voice customization.
• Dynamic Prompt Injection : Dynamic Prompt Injection lets you customize AI agent interactions in real time, delivering more personalized and context-aware conversations.

Synthflow Security and Compliance

Synthflow offers comprehensive security and compliance capabilities built for enterprise-scale, and high-sensitivity environments across regulated sectors such as finance and healthcare.

• SOC 2, HIPAA, and GDPR Compliant : Fully aligned with US and EU data standards, ensuring your sensitive information is protected with robust security and built-in privacy safeguards at every interaction.
• PCI DSS Compliant : Safeguard payment and cardholder data with built-in PCI DSS compliance, ensuring secure handling for transactions, account verification, and other sensitive workflows.
• In-House Data Management : All customer data and call logs are encrypted and stored internally, never shared with third parties, giving you full control and compliance.
• Strict Guardrails, Zero Hallucinations : AI relies only on verified knowledge sources, delivering accurate, brand-safe responses without off-script or speculative answers.

Synthflow Customer Support

Synthflow delivers powerful, multi-channel customer support, prioritizing rapid, AI-driven automation for efficient service.

• Direct Support Via Email : https://synthflow.ai/talk-to-sales
• Synthflow Academy : https://academy.synthflow.ai/
• Synthflow Help Center : https://helpcenter.synthflow.ai/

Synthflow App Review

Synthflow simplifies outbound calling with an easy, user-friendly setup and excellent call quality. Campaigns can be launched quickly without any developer work, and the clean, intuitive dashboard makes navigation simple. Analytics could be more detailed, particularly for call performance and conversions, and additional native integrations would be helpful instead of relying on Zapier. Still, for a newer platform, it’s already performing impressively.

The Better Synthflow Alternative Dograh AI 

Dograh stands out as a powerful open source alternative to Synthflow with several advantages :

• Free Open Source - Dograh is an free open source voice ai platform giving full flexibility to developers to customize, self host and extend features. Users should be able to try out in 1 line (should take <2mins ideally).
• 2 Min Launch - In the Create Workflow Dashboard, you can launch a voice agent in just 2 minutes by selecting inbound or outbound calls and writing “For the use cases of…” to describe your agent (e.g., qualify real estate leads, screen candidates, or handle customer support). This description becomes the LLM prompt, instantly generating your customized workflow.
• Pre Built Template - Dograh’s Pre-Built Templates let you launch an AI voice agent in just 2 minutes without writing any code or prompts, with easy customization through a global node for user-specific preferences.
• Global Node - The global node enables users to tailor their voice agents with specific preferences, such as updating industry names or applying custom modifications for personalization.
• License - Dograh AI is released under the BSD 2-Clause License, a true FOSS license with full flexibility, compatibility and the freedom to use, modify, and distribute.
• Easy to Use and Dependability - With AI to AI testing (over calls) and feedback loop through call summary, it is fairly easy to build extremely dependable bots with Dograh AI. Also this helps cut down on time needed to build the voice agent, and significantly improves time to market.
• LoopTalk - Think AI calling AI. Dograh’s LoopTalk auto-tests voice bots using AI-driven customer personas to simulate real-world scenarios boosting accuracy and letting you get started in minutes.
• No Double Billing - Dograh offers transparent pricing with no double billing charges for STT, TTS and LLM. And the open source solution is free to host and use.
• End-to-End Support - Dograh’s professional team offers end-to-end support from integration and workflow setup to analytics and optimization.
• Faster Setup - Dograh offers drag and drop workflow builder UI and prebuilt workflow as per your business needs.

Key Features

• NEPQ led Sales - Uses Neuro-Emotional Persuasion Questioning (NEPQ) to drive deeper engagement and guide conversations effectively.
• Real-Time Response - Dograh enables low-latency (<500ms), human-like voice conversations for seamless user interactions.
• Longer Conversation - Dograh multi-agent bots can handle calls up to 45 minutes, maintain full context throughout conversations without hallucinations.
• Human Like Speech - Pauses, Filler words & clear tone for realistic, engaging voice interactions.
• Emotionally Effective - Understand user concerns by actively empathizing and probing their pain points to deliver more personalized, effective voice interactions.
• Tailor-Made Build - Dograh experienced team offers hands-on support to help you design and deploy custom voice agents tailored to your scripts and business needs.
• Multilingual Voice Support - Support multilingual voice agents using top STT and TTS providers, enabling natural and fluent conversations for diverse global audiences.
• Expert Cloud Support - Get expert cloud support with Dograh test and refine your voice agent in real time using our intuitive, cloud-hosted interface.
• Flexible Deployment Option - Dograh supports both cloud and open-source deployments, giving you flexibility based on your business and technical needs.
• Customer Support - Dograh’s dedicated support team ensures your Voice AI runs smoothly from setup to ongoing updates with fast, reliable assistance.
• Data Privacy - Your data privacy is our top priority. Dograh’s open source solution helps adhere to strict GDPR and HIPAA standards to keep your information secure and fully compliant.

Ideal Users

• Real Estate Agent
• Customer Support
• Sales and Marketing Automation
• Tech Support
• Finance, Insurance and Banking
• E-Commerce
• Healthcare
• Logistics & Home Services
• Travel & Hospitality

Pricing

Dograh offers an open-source solution with no platform fees, making it highly cost-effective, customizable, and scalable.

Quick Comparison Table

Getting started with Dograh

Interested in leveraging Dograh for lead generation, cold calling or business automation ? Here’s a streamlined path to getting started, along with direct links to essential resources :

1. Dograh AI: Quick Start Demo

2. Run Docker Command

Download and Start Dograh first startup may take 2-3 mins to download all images

Docker

3. Quick Start Instructions

Step by step written guide to building and deploying your first voice AI Agent

• Open Dashboard: Launch http://localhost:3000 on your browser.
• Choose Call Type: Select Inbound or Outbound calling.
• Name Your Bot: Use a short two-word name (e.g., Lead Qualification).
• Describe Use Case: In 5–10 words (e.g., Screen insurance form submissions for purchase intent).
• Launch: Your bot is ready! Open the bot and click Web Call to talk to it.

4. Community & Support

Join Slack Community and discuss issue with Dograh experts :

Join Slack Community

5. Additional Resource

FAQ's