The Voice AI Stack Library

Dubbing and audio localization.

Cloud telephony with CRM integrations (Zoho, Salesforce); absorbed Servetel.

BFSI: sales, collections, renewals agents; $3M seed (Stellaris).

Speech-to-text and audio intelligence APIs with streaming transcription.

IIT Bombay-led govt consortium; speech model Shrutam.

BFSI, healthcare: India-resident enterprise voice AI, Cartesia-partnered; live TV debate demo.

Multilingual phone/web agents with bring-your-own LLM/STT/TTS.

Open-source-rooted Indic voice agent platform for recruitment, sales, support.

Cloud telephony and UC (IVR, dialers, CPaaS) with AI voice agents added.

Cloud telephony built around missed-call marketing and lead recovery.

Cloud calling infrastructure.

Ultra-low-latency text-to-speech models built for real-time voice agents.

Testing and observability for voice agents, from simulated calls to production monitoring.

Conversation intelligence: 100% automated QA, live agent assist, AI coaching.

Conversation intelligence, expanding into AI calling and WhatsApp campaigns.

Simulation and evaluation platform for voice and chat agents.

Fast, accurate speech-to-text APIs built for real-time voice agents.

BFSI, health insurance: multichannel voice, WhatsApp, SMS, email automation.

Sovereign language AI infrastructure for regulated enterprises across Indian languages.

Voice agents with regionally accurate accents for sales, support, collections.

Speech-to-speech agent-building CLI.

Open-source, self-hostable Vapi/Retell alternative with a visual workflow builder.

Public good: non-profit behind Sunbird and ONEST; co-ran 'Listen at Scale' with Sarvam and AI4Bharat.

Expressive multilingual text-to-speech and voice cloning, plus a conversational agents platform.

Voice API pioneer; CPaaS plus contact-center (Ameyo) and conversational AI (Cogno AI).

BPO: gig-based human calling workforce with quality and routing tooling.

Real-time multilingual speech-to-text API for voice products.

Own speech models and enterprise agent platform.

Gemini models, including the Live API for low-latency voice conversations.

BFSI: speech analytics and agentic calling; ₹85 Cr Series A (Elevation).

Low-latency LLM inference on custom hardware, popular for fast voice responses.

Automated testing and call simulation for voice agents, before and after launch.

Mobile-first conversational AI (voice, WhatsApp, web); owned by Jio Platforms.

CPaaS veteran (VivaConnect) with the Helo Convo no-code voice/chat agents.

Hospitality, F&B: multilingual voice/chat agents for bookings and orders, PMS integrations.

Safety-focused generative AI voice agents for healthcare.

Empathic voice interface that responds to tone and emotion in real time.

One of India's largest cloud comms providers: virtual numbers, IVR, call center.

Open-source WebRTC infrastructure and Agents framework for realtime voice and video AI.

Open-source Maya1 TTS model; $1.9M raised.

Conversation intelligence with 120+ Indian languages; clients include Titan, Asian Paints.

SME cloud telephony: IVR, call tracking, WhatsApp Business.

Inbound/outbound voice agent platform for Indian businesses.

Sovereign AI stack: fine-tuned Indic models and GPU infrastructure; also makes Bolcho and Drona.

Consumer CX: Zomato's support platform, now sold externally; 15M+ interactions a month.

Accel and General Catalyst-backed; acquired Verloop.io to combine chat and voice.

GPT models and the Realtime API, used as the reasoning layer in many voice agents.

Train agents on your data, simulate calls, deploy to real numbers; Accel-backed.

Open-source Python framework from Daily for building realtime voice and multimodal agents.

Global CPaaS for voice, SMS, WhatsApp APIs in 190+ countries.

Conversation intelligence and QA.

Platform for building and running phone-based AI voice agents at scale.

No-code voice/chat agent builder for calls, WhatsApp, web.

Persistent institutional-memory layer across sales and support conversations.

Sovereign Indic LLMs plus STT/TTS models.

Custom Indic speech models, voice agents, secure deployments.

Collections: generative voice AI (ex-Vernacular.ai); 1M+ collection calls weekly.

Ultra-low-latency TTS (sub-100ms) and voice cloning.

UCaaS/CPaaS (SMS, WhatsApp, voice) with a GenAI voicebot.

Grew from a human-calling marketplace into a large-scale voice AI sales platform.

Eval, observability, and self-learning layer for enterprise voice agents; $1.2M pre-seed.

Cloud communications with AI call routing, analytics, hosted PBX.

Programmable voice, phone numbers and SIP trunking used across most voice agent stacks.

Open-weight speech-native model that understands audio directly, with a hosted voice API.

'AI voice employees' for calls, lead qualification, CRM updates in 100+ languages.

Open-source telephony and voice-agent infra (LiveKit/Pipecat based) with dedicated numbers.

In-house Vani TTS behind unlimited-calling plans.

Developer platform to build, test and deploy voice agents on any STT, LLM and TTS.

Live video and WebRTC infrastructure, commonly used alongside voice stacks.

Full-stack voice AI with ASR/TTS APIs and a voice-native LLM, 25+ languages.

Cloud calling infrastructure.

Conversation intelligence and QA.

Phone, WhatsApp, web agents in 17+ languages with STT/LLM/TTS provider switching.

Bulk voice calls, IVR, missed-call services for SMB alerts.

Voice agents for sales, support, ops; Hindi and Indic agent products.

Simulation and testing for AI voice/chat agents before deployment.

Lending: conversational voice/chat, document intelligence, scoring for banks and NBFCs.

AI-first communications platform combining carrier-grade telephony with a voice AI engine, with REST APIs and webhooks for voice agents.

Voice calling and WhatsApp agents with voice cloning; founded 2024.