Syllable
Syllable provides a provider-agnostic agentic AI platform that enables enterprises to build, deploy, and optimize AI voice and chat agents across healthcare, e-commerce, automotive, and customer support verticals, with multi-cloud failover and built-in compliance.
- Company typePrivate
- Founded2017
- HeadquartersMountain View, United States
- Headcount11–50
- GTM typeB2B
- OfferingSoftware
What Syllable does
Syllable is a provider of an agentic AI platform that enables enterprises to build, deploy, and optimize production AI agents across voice, SMS, chat, email, and WhatsApp channels. The company was incorporated in Delaware in 2017 as a healthcare-focused patient communication provider (Syllable Patient Assistant) and has since expanded into a horizontal platform serving healthcare (athenahealth, Diana Health, CancerIQ, Heartbeat Health, Hello Heart, Luma Health, NextHealth, Orbita, Ride Health, Wider Circle), e-commerce (Shopify-based retailers), automotive (dealership lead qualification), insurance, home services, and general customer support verticals, with additional named customers including Google, EvenUp, SurveyMonkey, Reach Mobile, Africa's Talking, Datavant, HiddenLayer, SaaS Labs, and Spyne AI. The platform reports 5 million+ calls automated annually, 99.99% uptime, 10.9x ROI on AI outreach campaigns, and 100% of calls answered by AI within 8 weeks of deployment across its customer base.
The platform architecture is centered on an Agentic Infrastructure runtime with three provider-agnostic gateway services: an LLM Gateway (routing across OpenAI, Google, and Anthropic models with smart routing, automatic failover, and cost-aware policies), an STT Gateway (multi-provider speech-to-text with policy-based routing), and a TTS Gateway (supporting Deepgram Aura, ElevenLabs with 10,000+ voices across 70+ languages, and Google Cloud TTS). The runtime supports multi-cloud deployment across AWS, GCP, Azure, and OCI with automatic failover, zero-trust security, durable workflow orchestration for long-running tasks, and elastic scaling. Development tools include the Meta Agent Builder (no-code conversational agent assembly), Python and TypeScript SDKs, a Vector DB for retrieval-augmented generation, Step Tools for structured form-filling workflows, and Responsive Dialogue for real-time interruption handling. The platform is certified SOC 2 Type II, HITRUST e1, GDPR, and EU AI Act compliant.
Syllable generates revenue through a platform SaaS subscription combined with usage-based metering for tokens, API calls, and runtime minutes, with third-party LLM, STT, and TTS provider costs passed through at cost with no markup. Distribution combines product-led growth (free trial at syllable.cloud, free live training classes, GitHub-hosted SDK) with enterprise field sales for mission-critical deployments and a Microsoft Marketplace listing launched in December 2025. Headquartered in Sunnyvale, California with 11-50 employees, the company has raised approximately $82 million across four funding rounds (including a $28M Series B in July 2021 and a $40M Series C in April 2022) from Oak HC/FT, Section 32, Verily, and TCV, and acquired Actium Health in March 2024.
Syllable firmographics
Firmographics- Name
- Syllable
- Legal name
- Syllable Corporation
- Website
- https://syllable.ai
- Company type
- Private
- Founded year
- 2017
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- Syllable provides a provider-agnostic agentic AI platform that enables enterprises to build, deploy, and optimize AI voice and chat agents across healthcare, e-commerce, automotive, and customer support verticals, with multi-cloud failover and built-in compliance.
- Ownership category
- akta.pro rank
Syllable industry classification
Industry- Product category
- AI Agent Platform
- NAICS
- Software Publishers (5132), Custom Computer Programming Services (541511)
- SIC
- Services-Prepackaged Software (7372), Services-Computer Programming, Data Processing, Etc. (7370)
- akta.pro primary industry
- AI Application Enablement Platforms (Copilot/Agent Frameworks, SDKs) (HDAEANAJ)
- akta.pro secondary industries
- End-to-End Enterprise AI Platforms (MLOps & Model Lifecycle Management) (HDAEANAA), LLMOps & Generative AI Platforms (Prompt/Agent Orchestration, RAG) (HDAEANAD), Model Serving, Inference & Deployment Platforms (APIs, Edge/On-Prem) (HDAEANAC), Conversational AI Platforms (chat/voice bots, orchestration) (HDAAAFAC)
Keywords
Where Syllable is headquartered
LocationHeadquarters
- HQ city
- Mountain View
- HQ country
- United States
- HQ region
- North America
Offices2 records
Markets served
Syllable business model
Business model- GTM type
- B2B
- Offering type
- Software
- Cost components
- Technology or R&D, Infrastructure, Personnel, Marketing or Sales, Operations
Revenue model
- Platform SaaS Subscription: Subscription-based access to the Syllable Agentic Platform including build, run, and optimize capabilities. Billed as metered rates with pass-through costs for third-party LLM, STT, and TTS providers at cost with no markup.
- Usage-Based Consumption: Metered rate billing based on usage including token consumption, API calls, and runtime minutes. Third-party provider costs (OpenAI, Google, ElevenLabs, Deepgram) flow through at cost.
- Professional Services: Training and onboarding support including free live classes for platform education. Enterprise implementations likely involve custom deployment and integration services.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Freemium | Monthly | Free Trial - Platform access for evaluation |
| Usage-based | Pay-as-you-go | Enterprise - Custom pricing based on usage and scale |
Go-to-market motion2 records
Distribution channels3 records
Marketing channels6 records
Syllable product offering
Product offeringCore offering
Syllable provides an agentic AI platform that enables enterprises to build, run, and optimize production AI agents across voice, SMS, chat, email, and WhatsApp channels. The platform offers provider-agnostic gateway services for LLM, STT, and TTS routing with automatic failover, multi-cloud deployment across AWS, GCP, Azure, and OCI, and no-code agent assembly through the Meta Agent Builder. It targets healthcare, automotive, insurance, home services, and e-commerce organizations requiring mission-critical reliability, compliance (SOC 2 Type II, HITRUST e1, GDPR, EU AI Act), and operational discipline for AI agent deployments.
Product overview
Syllable is an agentic AI platform enabling organizations to build, run, and optimize production AI agents. The platform operates on a modular architecture centered on the Agentic Infrastructure (production runtime) with three gateway services: LLM Gateway (multi-provider model routing), STT Gateway (speech-to-text), and TTS Gateway (text-to-speech). The Build, Run, and Optimize modules provide the development lifecycle workflow, while the Channels module handles multi-channel deployment (voice, SMS, chat, email, WhatsApp). Additional components include Vector DB for knowledge retrieval, Meta Agent Builder for no-code agent creation, and various showcase agents demonstrating specific use cases. The platform is provider-neutral, supporting deployment across AWS, GCP, Azure, and OCI with automatic failover and no vendor lock-in.
Differentiator
Problem solved
Functional benefit
Brands
- Syllable Patient Assistant: AI-powered healthcare automation product that facilitates patient communication via voice, web, and SMS.
- Agentic Platform
- LLM Gateway Service
- STT Gateway Service
- TTS Gateway Service
- Agentic Infrastructure
- Meta Agent Builder
- Vector DB
Products and services
- Syllable Agentic Platform End-to-end platform for building, running, and optimizing production AI agents across voice, SMS, chat, email, and WhatsApp channels, composed of Agentic Infrastructure, LLM/STT/TTS gateways, Vector DB, Meta Agent Builder, and Channels module. Targets enterprises and healthcare providers requiring mission-critical reliability, compliance certifications, and provider-neutral multi-cloud deployment.
- Agentic Infrastructure Production runtime layer for AI agents providing multi-cloud deployment across AWS, GCP, Azure, and OCI with provider-agnostic gateways, durable workflow orchestration for long-running tasks, cellular architecture, zero-trust security, and 99.99% uptime SLA. Sold as a standalone component of the Syllable Agentic Platform.
- LLM Gateway Service Multi-provider routing service for large language models enabling policy-based routing by cost, latency, quality, or data residency across OpenAI, Google, and Anthropic models. Provides automatic failover and full observability into model performance and token consumption.
- STT Gateway Service Speech-to-text gateway standardizing transcription across multiple providers with routing flexibility based on language, accuracy, latency, or cost. Supports streaming audio processing for low-latency live conversations with automatic failover between providers.
- TTS Gateway Service Text-to-speech gateway with multi-provider support integrating Deepgram Aura, ElevenLabs, and Google Cloud TTS. Supports voice configuration, brand identity matching, voice cloning, and automatic failover for uninterrupted voice delivery.
- Meta Agent Builder Conversational interface within the Syllable Console enabling domain experts to assemble AI agents without writing code. Guides users through agent configuration using natural language prompts and provides declarative APIs for engineering teams.
- Vector DB Vector database service for knowledge retrieval and semantic search capabilities supporting retrieval-augmented generation patterns across agent knowledge bases.
Quantifiable outcome
- 5M+ calls automated annually across platform deployments
- +3 more outcomes
Companies that use Syllable
Customer profileNamed customers15 records
Segments3 records
Ideal customer profiles3 records
Syllable technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- Yes
- API docs
- API detail
Core technology
AI maturity
App detail
Integration9 records
AI capability13 records
Feature7 records
Syllable partnerships and signals
Strategic signalPartnerships
Ten partnerships are on record, tiered core and notable.
- MicrosoftcoreSyllable AI agentic platform available in Microsoft Marketplace, enabling Azure customers worldwide to deploy and manage conversational AI solutions. Leverages Azure's secure cloud infrastructure.
- TwiliocoreTwilio is the primary telephony provider for voice channels. Syllable supports both external Twilio accounts (Elastic SIP Trunking) and Syllable's own Twilio account for phone numbers and PSTN transfers.
- Google CloudcoreGoogle Cloud TTS (Chirp 3 HD voices) integrated via TTS Gateway. Supports 30+ languages with SSML prosody control and voice cloning. Vertex AI integration available for GCP customers.
- ElevenLabscoreElevenLabs TTS integrated via TTS Gateway. Offers 10,000+ voices across 70+ languages with sub-100ms latency and voice cloning capabilities for branded agent personas.
- DeepgramcoreDeepgram provides both STT and TTS via Syllable gateways. Deepgram Aura offers low-latency streaming for real-time conversational AI with 7 languages and self-hosted deployment option.
- OpenAIcoreOpenAI LLM models (GPT-4o, GPT-4o-mini, GPT-4.1, GPT-5 series) supported via LLM Gateway with smart routing and failover capabilities.
- EpicnotableEpic EHR integration available via integrations hub, enabling healthcare organizations to connect Syllable AI agents with Epic's electronic health record system.
- SalesforcenotableSalesforce integration available for CRM connectivity, enabling AI agents to access and update customer relationship data.
- ShopifynotableShopify Admin API integration via proxy service pattern. Demo agent available for order lookups, product search, returns processing, and store FAQ automation.
- Google DrivenotableGoogle Drive integration for data source connectivity, enabling agents to access documents and structured data from Google Drive.
Scale indicators6 records
Recent moves5 records
Expansion highlights6 records
Syllable competitors and assessment
Company assessmentDirect peers
- Vapi: Vapi provides a developer platform for building and deploying AI voice agents with multi-provider LLM and speech model routing. Closely comparable to Syllable's voice agent infrastructure, gateway architecture, and developer-first go-to-market motion.
- Retell AI: Retell AI offers a platform for building production AI voice agents with low-latency speech pipelines and enterprise reliability features. Direct competitor in the conversational voice agent infrastructure category.
- Bland AI: Bland AI enables enterprises to build, deploy, and scale AI phone agents with custom workflows and telephony integration. Directly comparable in voice agent platform positioning and enterprise sales motion.
- Voiceflow: Voiceflow provides a collaborative platform for designing, prototyping, and deploying conversational AI agents across voice and chat. Comparable as a no-code agent builder with enterprise deployment capabilities.
- Cognigy: Cognigy is an enterprise conversational AI platform for automating customer service with AI agents across voice and digital channels. Comparable as an enterprise-focused conversational AI agent platform with similar multi-channel deployment.
- Kore.ai: Kore.ai provides an enterprise conversational AI and agent platform with no-code tools, pre-built integrations, and multi-channel deployment. Closely comparable in scope, enterprise GTM, and platform architecture.
Emerging players
- Decagon: Decagon builds AI agents for enterprise customer support with focus on autonomous resolution and conversational interfaces. Comparable in agent platform positioning with a narrower focus on customer support workflows.
- Sierra: Sierra develops AI agents for enterprise customer experiences with emphasis on reliability and brand-aligned conversations. Emerging competitor in the AI agent platform category with comparable enterprise go-to-market.
Broad incumbents
- Cresta: Cresta provides AI-powered contact center solutions including agent assist, virtual agents, and conversation intelligence. Comparable as a broader contact center AI platform overlapping with Syllable's voice agent use cases.
- Yellow.ai: Yellow.ai is an enterprise conversational AI platform supporting customer service automation across voice, chat, and social channels. Comparable in multi-channel agent deployment with broader enterprise customer engagement positioning.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat5 records
Key risks6 records
Key highlights7 records
Customer concentration
Syllable social profiles
Digital presenceSyllable compliance and trust
Trust signalCompliance4 records
Syllable financial estimates
Financial estimateRevenue estimate
Valuation estimate
Syllable leadership team
Management profileNumber of profiles
Profiles3 records
Syllable funding detail
Funding detailFunding overview
Funding rounds4 records
Investors8 records
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Syllable M&A and investment
M&A and investmentM&A1 record
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Syllable
What does Syllable do?
Syllable provides an agentic AI platform that enables enterprises to build, run, and optimize production AI agents across voice, SMS, chat, email, and WhatsApp channels. The platform offers provider-agnostic gateway services for LLM, STT, and TTS routing with automatic failover, multi-cloud deployment across AWS, GCP, Azure, and OCI, and no-code agent assembly through the Meta Agent Builder. It targets healthcare, automotive, insurance, home services, and e-commerce organizations requiring mission-critical reliability, compliance (SOC 2 Type II, HITRUST e1, GDPR, EU AI Act), and operational discipline for AI agent deployments.
Is Syllable a public or private company?
Syllable is a private company. It is classified as venture growth investor backed and is currently operating.
When was Syllable founded?
Syllable was founded in 2017. It employs 11 to 50 people.
Where is Syllable based?
Syllable is headquartered in Mountain View, United States, in the North America region.
How does Syllable make money?
Three revenue lines are on record. Platform SaaS Subscription is the primary driver. The others are usage-Based Consumption and professional Services.
Who are Syllable's main competitors?
Direct peers on record are Vapi, Retell AI, Bland AI, Voiceflow, Cognigy and Kore.ai. Emerging players are Decagon and Sierra. Broad incumbents are Cresta and Yellow.ai.
Does Syllable have an API?
Yes. Syllable provides a public API and SDK for developers to build, deploy, and manage AI agents. The platform supports RESTful API access through documented endpoints. SDKs are available in Python and TypeScript. Developers can programmatically create and manage agents, prompts, tools, messages, data sources, channels, campaigns, and batches. API tokens are managed through the Console interface. Documentation available at docs.syllable.ai with guides for SDK environment setup. Developer documentation is at docs.syllable.ai/introsyllable/HowSyllableWorks.
What industry is Syllable in?
Syllable's product category is AI Agent Platform. Its primary akta.pro industry code is HDAEANAJ, AI Application Enablement Platforms (Copilot/Agent Frameworks, SDKs), with a secondary code of HDAEANAA, End-to-End Enterprise AI Platforms (MLOps & Model Lifecycle Management). Its NAICS code is 5132 and its SIC code is 7372.