voice-agents
(22)
DRUID AI
The Bucharest company teaching enterprise software to hold a conversation - and now to run the workflow behind it.
Agnost AI
Agnost AI is a Y Combinator (S26) startup building product analytics for teams shipping conversational AI agents. It reads every production chat and voice conversation, clusters what users want, where they get stuck, and why they churn, then turns those patterns into evals, debug trails, and automatic pull requests that improve the agent. It installs in three lines of code or via an OpenTelemetry exporter, works with any LLM and framework, and processes over a million events a day for customers including Google, Exa, and Corgi.
Apten
Apten is a Y Combinator (S24) startup building omni-channel AI agents that engage and nurture leads across SMS, voice, email, and webchat. Aimed at B2C enterprises in home services, insurance, education, healthcare, and financial services, its agents hold one continuous memory across every channel, follow up at the right moment, transfer live calls to humans, and plug into CRMs like Salesforce and HubSpot. The company says its conversational approach converts previously dead leads into sales opportunities at a much higher rate than robocalls or static drip campaigns.
Callab AI
Callab AI builds AI voice agents that plug directly into the legacy, on-premises phone systems most large call centers still run on. Instead of forcing a cloud migration, its carrier-grade telephony stack connects to hardware like Avaya, Cisco UCM, and Mitel over SIP trunks and automates a large share of inbound calls within about a week. Founded by Tunisian engineers Haithem Kchaou and Chehir Dhaouadi and part of Y Combinator's Spring 2026 batch, the company handles calls in Arabic and its dialects plus several other languages, and serves customers across North America, Europe, and the Middle East.
Callbook AI
Callbook AI is a Y Combinator (S26) startup building AI voice agents that make and take business phone calls in English, Spanish, and Portuguese. Founded by Colombians Diego Avellaneda and Daniel Martinez, it began as a plug-and-play AI phone system for Zoho CRM and has sharpened its focus on automated debt collections and portfolio management across Latin America, handling calls, WhatsApp, SMS, and email from a single platform.
DiligenceSquared
DiligenceSquared is a New York AI company that automates commercial due diligence for investors. Its AI agents run expert interviews with customers, competitors, and market specialists, then synthesize the findings into interactive reports where every claim links back to a source transcript. Founded by two ex-Blackstone and ex-BCG private equity operators plus a former Google engineer, it delivers consulting-grade market research for a fraction of the $500K-$1M that firms like McKinsey, Bain, and BCG typically charge.
Hemut
Hemut is an AI-native operating system for trucking companies. It replaces the fragmented, legacy back-office software that carriers and brokers rely on with a single platform that automates dispatch, load booking, quoting, tracking, accounting, and inbound/outbound phone calls using AI agents. Founded in 2024 and part of Y Combinator's Spring 2025 batch, Hemut targets mid-sized fleets in the roughly $875B American trucking market.
Mercura
Mercura is a Munich-based YC W25 startup building AI software that turns messy sales requests - emails, tender specs, phone calls - into structured, spec-compliant quotes and orders for industrial distributors and manufacturers. It reads unstructured inquiries, matches them to catalog products, prioritizes margin, and pushes the result straight into a customer's ERP.
Roark
Roark is an observability, testing, and quality-assurance platform for voice AI agents. It lets teams replay real production calls against new agent versions, catch failures before they ship, track caller sentiment and vocal cues, and monitor live voice interactions with 40+ built-in metrics. Founded in 2025 and backed by Y Combinator (W25), Roark says it processed more than 10 million minutes of calls in its first six months.
AssemblyAI
AssemblyAI is a San Francisco speech-AI company that builds and serves models turning audio and video into accurate text, plus higher-level 'audio intelligence' like summaries, sentiment, speaker labels, and PII redaction. Founded in 2017 by Dylan Fox, it sells a developer-first API used to add transcription, real-time streaming, and voice-agent capabilities to software. The company has raised more than $113M across seed to Series C and reports processing over a million hours of audio a day for customers ranging from startups to large enterprises.
Dasha
Dasha is a voice AI platform that lets developers build, test, and deploy human-like conversational voice agents to automate phone-based business processes such as sales calls, customer support, and lead qualification. Founded by Vladislav Chernyshov and Ilya Stupakov, the company built its own low-latency speech recognition and text-to-speech stack, and exposes conversation design through a purpose-built scripting language (DashaScript) and a JavaScript/Node.js SDK. It positions itself as infrastructure for developers who want production-grade, real-time voice AI at scale.
Synthpop - Healthcare AI
Synthpop is a Cambridge, Massachusetts healthcare AI company building agentic automation that eliminates administrative bottlenecks across payer, provider and patient operations. Its platform combines document intelligence, payer-aware reasoning and conversational voice agents into one coordinated system that automates as much as 80% of healthcare back-office processes - referrals, prior authorizations, eligibility checks and claims follow-ups - by integrating directly with EHR, billing and e-prescribe systems. Founded in 2023 by Elad Ferber and Jan Jannink, the company has raised $23M total, including a $15M Series A in February 2026.
Murf AI
Murf AI is a voice technology company that turns text into natural-sounding speech. Founded in 2020 by three IIT Kharagpur friends, it started as a self-serve AI voiceover studio for creators and marketers and has since expanded into dubbing, voice cloning, a low-latency text-to-speech API (Falcon), and conversational voice agents. Murf says its platform is used by more than 10 million people and 300+ Forbes 2000 companies across 190+ countries, offering 200+ voices in 35+ languages.
Syllable
Syllable is a Mountain View, California company that builds, deploys, and manages AI voice and text agents, originally to automate patient communication for health system call centers and medical practices. Founded in 2016, it has expanded from healthcare-specific natural language understanding into a broader, model-neutral agentic platform that lets organizations build agents once and run them across any cloud with governance, analytics, and compliance built in. The company has raised roughly $81.7M+ across Seed through Series C, counts investors like TCV, Oak HC/FT, Verily, and Northwell, and acquired Actium Health in 2024.
LemonSlice
LemonSlice is a San Francisco AI research and product lab that turns a single photo into a real-time, talking video avatar - the visual face for voice agents and chatbots. Its Lemon Slice-2 model is a purpose-built, large-scale video diffusion transformer that generates every pixel from scratch to produce expressive, full-emotion talking characters (human or cartoon) that livestream at conversational speed. Founded in 2024 by three PhD-creators (formerly Infinity AI), the company raised a $10.5M seed led by Matrix Partners and Y Combinator to make all video interactive.
Avora
Avora builds AI agents for dental operations. Its agents listen to appointments, draft clinically accurate chart notes, coach providers in real time on treatment-plan communication, and surface practice-level analytics for dental practices and DSOs. Founded in 2024 and backed by Y Combinator and CRV, Avora aims to lift case acceptance and give providers back hours each day without forcing practices to hire more staff.
Assembled
Assembled is a San Francisco-based software company building the workforce management and AI agent platform for modern customer support teams. Founded in 2018 by three Stripe veterans, it now helps companies like Stripe, Robinhood, GoFundMe, Etsy, and Intercom forecast demand, schedule agents, and resolve a growing share of tickets with AI across chat, voice, and email.
Deepgram
Deepgram builds foundational voice AI - speech-to-text, text-to-speech, and full voice-agent APIs - used by more than 1,300 enterprises including NASA, Spotify, Twilio and Citibank to give machines the ability to listen, understand, and respond in real time.
HappyRobot
HappyRobot is the AI-native operating system for the real economy, deploying autonomous AI workers that handle phone calls, emails, and complex operational tasks for logistics and supply chain enterprises. Founded in 2022 by Pablo Palafox, Luis Paarup, and Javier Palafox, the company emerged from Y Combinator S23 and has raised $62 million in total funding - including a $44M Series B led by Base10 Partners. HappyRobot's AI agents now serve 150+ enterprise customers including DHL, Ryder, Werner, and Schneider, automating millions of voice minutes and hundreds of thousands of emails annually, reducing appointment scheduling from a week to under 30 minutes and delivering collections ROI exceeding 100x.
Vapi
Vapi is a San Francisco developer platform for building, testing, and deploying conversational voice AI agents over phone and web. It abstracts the messy plumbing of speech-to-text, LLMs, text-to-speech, and telephony so developers can ship human-sounding voice agents in minutes, with sub-500ms latency and enterprise-grade compliance.
Decagon
Decagon is a San Francisco-based enterprise AI company building conversational agents that handle customer support across chat, email, voice and SMS. Its platform, anchored by Agent Operating Procedures (AOPs), lets companies define complex workflows in natural language and apply them consistently across channels. Customers include Hertz, Chime, Notion, Duolingo, Rippling, Bilt, Oura, Eventbrite and Affirm.
Toma
Toma builds AI voice agents that answer the phone for U.S. car dealerships, booking service appointments, fielding parts requests, and saving BDC teams hundreds of hours a week. Founded by Monik Pamecha and Anthony Krivonos in early 2024, the company has raised a $17M Series A from Andreessen Horowitz and is approaching eight-figure ARR with more than 100 dealership customers.