Synthflow vs Open Source Voice Agents: Which to Choose ?

Synthflow ai is a no-code platform for building customizable voice agents, multilingual platform 30+ languages. The platform is not focused on the European market, it is an old generation platform dependent on single prompt, users cannot build multi agent conversational flow architecture.

To overcome single prompts and predictable conversation graphs Synthflow ai has launched Flow Designer for creating structured, multi-step voice agents. But many users claim it is not up to the mark not even compete with OSS platform multi architecture Dograh AI, LiveKit and Pipecat.

Comes with avg. rating of 4.0 on trustpilot, praise it for intuitive design and user-friendly setup, community around reddit/trustpilot complain about overpriced enterprise plan. And poor customer / tech support during the glitches.

A Quick Overview on Synthflow AI Alternatives

A quick overview of Synthflow AI and AI voice agent open source platform like Dograh AI, Pipecat, LiveKit and Vocode to help you choose a better Voice ai agent github platform.

What is Synthflow AI

Synthflow AI pricing includes Pay as you Go plan 5 concurrent calls, then $20/reserved concurrency and Enterprise plan. The use cases Lead qualification buyer (Real Estate), Customer support restaurant (E-commerce) and Healthcare receptionist.

Voice agents allow user to :

• Flow designer offer two modes, flow view for multi conversational architecture and prompt view for single prompt conversation.
• Synthflow claims to integrate with many platforms like Hubspot, Salesforce, Stripe, Cal.com, Zapier etc.
• Synthflow offers a knowledge base for reference documents during conversation.
• Synthflow’s AI Sandbox is a built-in test center for safely simulating and validating voice agents before deployment.

What is Dograh AI 

Dograh AI voice ai agent github ensures privacy and low latency through a self-deployable, fully open-source platform with no vendor lock-in and complete transparency. Supporting 30+ languages, it gives developers full control over data, workflows, models and integrations.

Dograh AI allows user to :

• 2 mins setup from zero to working voice bot in 2 mins.
• No code agent builder, visual flow design with prebuilt template.
• Real time preview and testing, custom prompts and responses.
• Telephony integration to any phone system like Twilio or Vonage or bring your own SIP trunk.
• Flexible deployment custom branding and styling option.
• Langfuse observability offers real-time monitoring, TTFB and performance metrics, conversation transcripts, and LLM usage tracking.
• Dograh AI is free to use as an open-source platform, with costs limited to the LLM, STT and TTS vendors you choose to run.

What is Pipecat 

Pipecat is an open-source Python framework for building real-time voice and multimodal conversational agents technical knowledge prerequisite hence suited for technical teams. It also simplifies orchestration of audio, video, AI services, transports and conversation pipelines.

Pipecat allows user to :

• Voice-first, with built-in speech recognition, text-to-speech, and conversation handling.
• Pluggable, with support for multiple AI services and tools.
• Composable pipelines that let you build complex behaviors from modular components.
• Real-time, ultra-low-latency interactions across multiple transports such as WebSockets and WebRTC.
• With Pipecat users can build Voice Assistants, AI Companions, Multimodal Interfaces, Interactive Storytelling, Business Agents and Complex Dialog Systems.

What is LiveKit

LiveKit agent is an open source framework for building real-time voice and multimodal conversational agents. Flexible integration to STT/TTS, LLM and realtime API. Built-in task scheduling and dispatch APIs to connect users with agents. The platform is depend on technical framework and require technical development to go to production, hence more suited for deeply technical teams.

LiveKit allows user to :

• Extensive WebRTC clients with open-source SDKs to build apps across all major platforms.
• Seamless telephony integration with LiveKit, enabling agents to make and receive phone calls.
• Built-in testing framework with judges to verify agent performance.
• Semantic turn detection helps to reduce interruptions.
• Exchange data with clients using RPCs (Remote Procedure Calls) and Data APIs.

What is Vocode

Vocode is an open-source library for building voice agents.. It offers conversation abstractions, endpointing and integrations with STT (Deepgram), LLMs (OpenAI), and TTS (ElevenLabs) across telephony, web, and Zoom.

Vocode allows user to :

• Vocode services allow users to automate inbound/outbound calls via API.
• Provides conversation abstractions for both streaming and turn-based interactions.
• Supports conversation features such as endpointing and emotion tracking.
• Integrates with leading speech-to-text and text-to-speech providers, making it easy to choose the best voices and transcription engines.
• Supports telephony, web and Zoom for cross-platform voice agents.

Features of Synthflow Alternative Open Source

Below are the features of free, open-source Synthflow AI alternatives like Dograh AI, LiveKit, Pipecat, and Vocode to help you choose the best open-source AI voice agent.

Synthflow AI features

• Supports 30+ languages with natural accents for global use.
• Users can create outbound, inbound, widget or chat agents.
• The Flow Designer enables building structured, multi-step AI voice agents through a visual, node-based interface.
• Guaranteed uptime for SLA 99.99%.
• Security and compliance SOC 2, HIPAA, PCI DSS and GDPR with full encryption.
• AI Sandbox enables simulated testing with metrics, version control and safe iteration before live deployment.
• Knowledge bases with RAG-powered document uploads for context-aware responses from FAQs, policies, and product data.

Dograh AI features

• No-Code Builder : Easily create advanced AI voice agents with a drag-and-drop interface, no programming needed.
• Natural Language Processing : Advanced NLP enables AI agents to understand context and intent with human-like accuracy.
• Real-Time Analytics : Track conversations, measure performance and optimize agents with detailed insights.
• 24/7 Availability : AI agents work nonstop, managing customer inquiries and generating leads anytime.
• Multi-Language Support : Provides multi-language support, enabling agents to speak multiple languages and handle diverse accents seamlessly.
• Voice customization : Allowing selection of different voice profiles or creation of custom voices to match brand personality.
• Intelligent Routing : Automatically directing complex queries to human agents to ensure an optimal customer experience.
• AI-powered insights : Analyze conversation data to understand customer needs and preferences.
• Open Source Voice Agents Free : Dograh AI has no platform fees users only pay LLM, STT and TTS costs directly to vendors.
• Data Privacy : Dograh AI is a self-hosted platform, ensuring full control over data and minimizing the risk of data breaches.
• Community : Dograh AI 24/7 support slack community help you resolve queries.

Pipecat features

• Enables ultra-low-latency interactions across multiple transports, such as WebSockets and WebRTC.
• Supports integration of speech recognition, text-to-speech, and conversation management.
• Provides end-to-end audio processing with VAD, noise suppression, channel interruption handling and semantic turn-taking for natural, fluid conversations.
• Offers WebRTC/WebSocket support for browser and mobile integration, enabling scalable sessions without platform fees.
• Allows mixing and matching services like Amazon Transcribe or Silero VAD for greater flexibility.
• Discord community for help and support.

LiveKit features

• LiveKit pricing includes Build ($0/Month), Ship ($50/Month), Scale ($500/Month) and Enterprise (Custom).
• Provides a comprehensive ecosystem to combine the right STT, LLM, TTS, and real-time APIs to fit any use case.
• No credit card needed, Includes 1,000 free agent session minutes per month.
• LiveKit open source SDK ecosystem for building client applications.
• Builtin test framework for analyzing the performance of voice agents.
• With LiveKit users can build Starter agent, Outbound Caller, Text-only-agent, Multi user transcriber, Video avatars and Restaurants ordering/ Reservations.

Vocode features

• With Vocode, users can build real-time, streaming LLM-powered conversations and deploy them across phone calls, Zoom meetings and more.
• Users can also build personal assistants or voice-based apps such as voice-controlled chess.
• Vocode offers simple abstractions and integrations, bringing everything you need into a single library.
• Vocode manages streaming and turn-based conversations with support for endpointing and interruptions.
• Integrations with all leading STT, TTS and LLM providers.
• Discord community support to resolve queries.

Comparing Synthflow AI, Pipecat and Dograh AI features

Why choose one over the other ?

• Transparent pricing with full cost control and no hidden charges like synthflow.
• Easy, reliable voice bot development.
• Simple setup with no-code or low-code options.
• Clear voice quality, low latency, and natural speech.
• Seamless integrations and workflow automation.
• Strong security, compliance, and flexible deployment options.
• AI-powered insights and optimization with built-in testing tools (e.g., LoopTalk).

What are the customers saying ?

Top Open-Source Synthflow Replacements: Featuring Dograh AI

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

Describe use case

Create Workflow Dashboard

Auto-generated templates - test your bot and customize quickly

Dograh AI Dashboard

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