PolyAI
Headquarters
London, United KingdomFounded
2017CEO / Founder
Nikola MrkšićEmployees
51-200Funding
Series D+ — $200M+Products
1 product listedAvg. AI Score
8.0/10Website
poly.ai/
Profile updated
About PolyAI
PolyAI is a London-based enterprise voice AI company. Founded in 2017 as a University of Cambridge spinout by Nikola Mrkšić, Pei-Hao Su, and Tsung-Hsien Wen — three Cambridge PhDs who had worked on VocalIQ, the voice-recognition startup Apple acquired in 2015 — it builds conversational dialog agents that handle inbound calls for enterprise contact centers.
The company's platform, Agent Studio, lets enterprises build, deploy, and adapt spoken dialog agents across multiple languages and channels, backed by a proprietary model called Raven trained on more than one billion enterprise conversations. PolyAI's customers include PG&E, UniCredit, Golden Nugget, Fogo de Chão, Quicken, and Simplyhealth, and it competes in the contact-center automation market against rivals such as Sierra and Decagon. Annual recurring revenue doubled to roughly $40 million in 2025, with U.S. revenue nearly tripling.
PolyAI has raised over $200 million to date. In December 2025 it closed an $86 million Series D at a $750 million valuation, led by Georgian, Hedosophia, and Khosla Ventures, with participation from NVIDIA's venture arm NVentures, the British Business Bank, Citi Ventures, and Point72 Ventures — a 50% jump from the $500 million valuation set in its May 2024 round. Led by co-founder and CEO Nikola Mrkšić, the company employs between 51 and 200 people and operates additional offices in the United States and Singapore.
Specialties
Financials
Dated, source-cited figures. Estimates are marked.
Products by PolyAI
All products by PolyAI reviewed by our AI panel of experts.
How Our Review Panel Scores PolyAI
Six independent reviewer personalities assessed PolyAI's product on their own terms. They landed within 0.8 points of each other, an unusually strong consensus.
Averaged across 1 reviewed product in our catalog. Scores are out of 10.
Competitive Landscape
Who PolyAI competes with, and how they differ.
German enterprise voice-AI platform pursuing the same large-enterprise call-automation deals; has raised far larger rounds recently (~$3B valuation vs. PolyAI's $750M) and leans harder into multi-agent orchestration tooling.
1 product reviewed on TopReviewed
Started as a real-time human-agent-assist and coaching layer for contact centers and has since added autonomous agents, whereas PolyAI was built voice-agent-first with no agent-assist/coaching product line.
1 product reviewed on TopReviewed
Grew out of contact-center conversation intelligence and QA/analytics, layering AI agents on top of that base, while PolyAI has no analytics/QA business and focuses purely on the voice agent itself.
1 product reviewed on TopReviewed
Bret Taylor/Clay Bavor-founded AI agent platform sold as channel-agnostic (chat, voice, SMS) for any consumer brand, versus PolyAI's deeper focus on high-volume phone-channel automation for contact-center-heavy verticals like hospitality, telecom and financial services.
1 product reviewed on TopReviewedPrivately-held, similarly-staged voice-AI startup (~$113M raised) automating routine inbound contact-center calls; the closest like-for-like product overlap to PolyAI, without an agent-assist or omnichannel product line.
Company Timeline
Key milestones in PolyAI's history, with sources.
- Launch
Opens Agentic Dialog Platform to all enterprise builders
PolyAI opened its self-serve Agentic Dialog Platform (Poly Agent Builder, Agent Development Kit) to any team, powered by its Raven model trained on over a billion enterprise conversations, free for the first two months.
prnewswire.com - Funding
Series D — $86M co-led by Georgian, Hedosophia and Khosla Ventures
PolyAI raised $86M in Series D funding at a $750M valuation, with participation from NVIDIA's NVentures, British Business Bank, Citi Ventures, Squarepoint Ventures, Sands Capital and Zendesk, taking total funding past $200M.
prnewswire.com - Funding
Series C — $50M at a ~$500M valuation
PolyAI raised $50M in Series C funding backed by new investors Hedosophia, NVIDIA's NVentures and Zendesk, with follow-on from Khosla Ventures, Georgian, Point72 Ventures, Sands Capital and Passion Capital, valuing the company at nearly $500M and taking total funding past $120M.
prnewswire.com - Funding
Series B — $40M led by Georgian
PolyAI raised $40M in a Series B round led by Georgian, with participation from Twilio Ventures, Khosla Ventures, Point72 Ventures and Amadeus Capital Partners, bringing total funding to $70M.
prnewswire.com - Funding
$14M growth round led by Khosla Ventures
PolyAI raised $14M led by Khosla Ventures, with participation from Point72 Ventures, Amadeus Capital Partners, Passion Capital, Sands Capital and Entrepreneur First, to accelerate US expansion, bringing total funding to $28M.
prnewswire.com - Funding
Series A — $12M led by Point72 Ventures
PolyAI raised $12M in Series A funding led by Point72 Ventures, with participation from Sands Capital Ventures, Amadeus Capital Partners, Passion Capital and Entrepreneur First.
amadeuscapital.com - Founded
PolyAI founded by Cambridge dialogue-systems researchers
PolyAI was founded in 2017 by Nikola Mrkšić, Tsung-Hsien Wen and Pei-Hao Su, PhD graduates of the University of Cambridge's Dialogue Systems Group, to build voice AI that could handle complex customer service dialog.
poly.ai
Explore AI Software Reviews
Browse multi-perspective AI panel reviews across hundreds of AI tools, agents, and platforms. Find the right software with insights from CTO, Developer, Marketer, Finance, and User perspectives.