Thoughtly
Thoughtly partners with Cartesia to transform real-time enterprise communications
"Before conversational voice models like Cartesia, Thoughtly relied on legacy text-to-speech APIs from major cloud providers. Nearly two years later, the evolution of this technology is staggering—customers can clone their voice and hear it speaking autonomously over the phone in just 60 seconds.”
Torrey Leonard, CEO, Thoughtly
10%
increase in appointment booking rate
35
offshore call agents removed
30
live transfers in under a second
About the company
Thoughtly is the leading AI-powered call center solution for enterprise-scale customer interactions. Designed for businesses that need reliable AI and complete automation, Thoughtly serves Fortune 500 companies and growing enterprises across financial services, healthcare, e-commerce, and professional services.
Unlike basic AI voice bots or developer-focused platforms, Thoughtly offers a comprehensive conversational AI solution that combines workflow automation, real-time analytics, and deep CRM integrations—all at just 9 cents per minute.
Thoughtly integrates seamlessly with Salesforce, HubSpot, Zendesk, Twilio, Slack, Zoho, and many other platforms, letting companies automate both outbound and inbound customer calls without technical complexity. It handles appointment scheduling, lead qualification, call automation, and smooth handoffs to human representatives, helping businesses scale their customer engagement with ease.
Customers value Thoughtly for its remarkably natural voice quality—which builds trust and improves conversion rates—and its user-friendly interface, making it the most practical and scalable AI calling solution available.
Try the interactive demo below:
The Challenge
Thoughtly serves Fortune 500 companies and major public enterprises, facing critical challenges in managing high-stakes customer communications at scale. Over the past three years, they extensively tested text-to-speech providers—from established cloud players like Microsoft, Google, and Amazon to newer venture-backed startups. They discovered that most solutions were optimized for asynchronous uses like content creation and voiceovers, falling short of enterprise needs. What they required was a voice AI solution that could handle massive call volumes while delivering consistent quality, low latency, and smooth integration with their customers' complex business tools.
The Solution
As an early design partner, Thoughtly selected Cartesia's voice AI technology for its unique focus on real-time enterprise applications, transforming their business communications.
Enterprise-Ready Platform: Built specifically for business needs, featuring flexible deployment options and efficient handling of peak call volumes through a developer-friendly interface.
Voice Cloning Workflows: Our industry-leading voice cloning needs just a 3-second sample from any environment, while competitors require hours of studio-quality recordings. Cartesia produces accurate voice clones from casual recordings, eliminating the need for professional studios and multiple takes. Thoughtly's customers love creating studio-quality voice clones in under 30 seconds and hearing them interact with their customers autonomously over the phone.
Superior Voice Quality: With access to over 200 ultra-realistic voices, organizations can maintain consistent branding across all customer touchpoints while enabling natural, fluid conversations.
Transcript Following: Expertly handles complex pronunciations—from specialized terminology to numerical data—making it perfect for diverse enterprise applications.
The results
As one of Cartesia's closest partners, Thoughtly has early access to their newest model. This latest version features improved voice quality, over 200 new voices, enhanced instant cloning capabilities, and hallucination-free transcript following.
Try these improvements yourself by calling Thoughtly's sample phone number:
1-220-SONIC-AI (1-220-766-4224)
Learn more about integrations in the Thoughtly documentation's Cartesia section at https://docs.thoughtly.com/platform/voices
Or in the Cartesia documentation's Thoughtly section at https://docs.cartesia.ai/integrate-with-sonic/thoughtly.
"Thoughtly's experience testing every existing voice solution, combined with their unique vision for real-time calling, made them an invaluable early design partner. Their deep understanding of enterprise requirements and candid feedback were instrumental in shaping Cartesia into the first truly enterprise-grade platform capable of supporting real-time calling for Fortune 500 and public companies."
Karan Goel, CEO of Cartesia
What our customers say
Join the growing list of companies opting for Sonic.
"In 1999, Salesforce brought software to the cloud. In 2025, 11x is killing software as we know it and unleashing the era of digital workers. To realise this vision, we needed AI voice technology that feels truly human. Cartesia’s technology gives our AI digital workers reps the speed, reliability, and natural expressiveness required to engage customers at scale.
It's the only solution fit for our relentless drive toward innovation.”
Keith Fearon, Head of Product & Growth, 11x
"Using Cartesia's generative voice API, Sonic, we’ve strengthened Cresta AI Agent to move beyond rigid scripts and towards delivering empathetic, human-like conversations that accurately represent customer brands and their commitment to excellent customer service. Sonic empowers Cresta AI Agent to resolve complex issues effortlessly, helping our customers gain real value from their AI investment and significantly improve their NPS and CSAT scores."
Tim Shi, Co-Founder & Chief Technology Officer at Cresta
"This partnership represents a transformative moment in enterprise AI adoption. By combining Rasa’s strengths in enterprise conversational AI with Cartesia's innovative voice technology, we're fundamentally changing how enterprises can deploy and scale AI assistants across their organizations."
Melissa Gordon, CEO of Rasa
