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Thoughtly’s expanded Voice Library brings faster, more expressive AI voices built for real-time conversations — helping voice agents sound more natural while powering revenue-driving workflows.
Voice agents are only as good as the conversations they can hold.
If responses lag, conversations break.
If the voice sounds robotic, trust drops.
And if the delivery doesn’t match your brand, the interaction feels off.
That’s why we’ve expanded and upgraded Thoughtly’s voice infrastructure through a new partnership with Cartesia, the world’s leading voice provider and research team. We’re bringing a new generation of faster, more expressive AI voices into the Thoughtly Voice Library.
The result: more natural conversations, greater control over delivery, and infrastructure designed for real-time GTM workflows.
For AI voice agents handling inbound leads, qualification calls, or routing high-intent prospects, latency isn’t just a technical detail — it shapes how the conversation feels.
With Cartesia now integrated into Thoughtly’s voice library, agents benefit from ultra-low latency designed for live telephony environments, delivering response times as low as sub-90ms in many cases.
What this means in production:
When conversations move at the speed people expect, engagement stays high and interactions feel real.
The expanded Voice Library dramatically increases the number of voices available inside Thoughtly.
Teams can now explore thousands of voices, accents, and languages, making it easier to match the voice of an AI agent to the audience it’s speaking with.
And for companies that want something even more personalized, voice cloning is now faster than ever.
With just 20–30 seconds of audio, teams can generate a custom voice that reflects their brand, spokesperson, or preferred tone.
This gives companies the ability to create a consistent spoken brand identity across every automated conversation, with the ability to clone the voices of their own real employees
Great conversational AI isn’t just about sounding realistic — it’s about sounding right for the context.
Inside Thoughtly, teams now have granular control over voice delivery, including:
Whether you’re building an AI agent for mortgage lead qualification, university admissions inquiries, or insurance follow-ups, you can tune the voice to match the expectations of that audience.
Because spoken brand voice is quickly becoming as important as written brand voice.
Built for reliability at scale
As part of this upgrade, Cartesia voices are now the default for new Thoughtly agents, providing a faster and more expressive starting point for new workflows.
At the same time, nothing changes for existing agents.
Users will continue to have access to:
This ensures teams can adopt our new expanded voice infrastructure without disrupting any live workflows.
Voice AI is moving beyond novelty.
Today, AI agents are qualifying inbound leads, booking meetings, routing calls, and following up with prospects — often acting as the first interaction a customer has with a company.
That means voice quality, latency, and reliability aren’t just product features.
They’re revenue infrastructure.
Our partnership with Cartesia is part of Thoughtly’s commitment to building the most reliable, enterprise-ready conversational GTM platform — one where your CRM doesn’t just store leads.
It talks to them.
About the author
Will works on growth at Thoughtly — across marketing, content, partnerships, and customer success for the voice AI platform. Most of what he writes comes from working directly with the teams deploying Thoughtly's inbound conversational agents.
