The Challenge: Most Voice AI Wasn't Built for Real-Time Agent Calls

Thoughtly is a Conversational GTM Platform that gives your CRM a voice — plugging directly into Salesforce and HubSpot to call, qualify, and route leads through real AI conversations. 1,000+ teams across high-velocity industries – including edX, Ace Hardware, Coldwell Banker, Compass, Pearson, and Farmers Insurance – use Thoughtly to launch voice agents without code, automate inbound and outbound calls, and drive measurable pipeline.

For enterprise teams, voice quality and real-time responsiveness directly impact conversion rates. That’s why Thoughtly has continuously evaluated and evolved its voice infrastructure.

Over the past several years, Thoughtly tested virtually every major TTS provider. Their previous solution worked, but as customer expectations rose — faster responses, better voice cloning, more expressive controls — it became clear the existing infrastructure couldn't keep up. Enterprise teams were asking for voice quality that matched the sophistication of their CRM workflows, and the gap was widening.

The Solution: Migrating to Cartesia as the New Default Voice Library

Thoughtly's requirements were specific to real-time enterprise calling: ultra-low latency for natural dialogue, reliable performance at peak call volumes, fast and scalable voice cloning, granular controls for brand consistency, and deep transcript accuracy for CRM workflows.

As an early design partner, Thoughtly worked closely with Cartesia to build the next generation of real-time enterprise voice infrastructure. Today, Cartesia is the default voice library for all new Thoughtly AI Voice Agents.

Cartesia's models are purpose-built for real-time telephony and conversational AI — not retrofitted from offline use cases. This architectural difference showed up immediately in performance: dramatically faster voice cloning and latency, and expressive controls that previous providers couldn't match. New builds now experience Cartesia front and center in the UI.

“As conversational voice technology matured, we realized enterprise AI calling required infrastructure purpose-built for real-time interaction. Migrating to Cartesia as our default voice library allowed us to deliver lower latency, faster cloning, and more expressive control—without sacrificing reliability at scale,” said Torrey Leonard, CEO of Thoughtly.

How Cartesia Powers Thoughtly’s AI Voice Agents

A New Default Experience

Cartesia is a product-level evolution. New agents automatically launch with Cartesia voices, and users can preview them instantly inside Thoughtly's UI. This ensures that new customers immediately get the highest-quality, lowest-latency voice infrastructure without needing to configure anything.

Production-Ready Voice Cloning in Seconds

For enterprise sales teams, brand voice consistency matters for every demo. Cartesia's cloning workflow is dramatically faster than what Thoughtly offered previously — users upload just 20–30 seconds of audio and generate a production voice clone in seconds.

This speed is a major advantage in sales demos and enterprise onboarding, where teams need a branded voice immediately. Combined with Cartesia's growing library of thousands of voices, accents, and languages, Thoughtly customers now have more options with less friction.

Lightning-Fast Response Time on Live Calls

In high-stakes enterprise calls — lead qualification, appointment booking, revenue conversations — even short pauses cost conversions. With Cartesia's sub-90ms latency, Thoughtly agents respond faster, sound more human, and maintain a natural conversational rhythm without robotic lag. For outbound campaigns where the first few seconds determine whether a prospect stays on the line, this responsiveness directly improves engagement and conversion rates.

Granular Voice Controls for Brand Alignment

Cartesia gives Thoughtly's users advanced controls over speed, volume, emotion, and delivery style — allowing RevOps and Growth teams to tune their AI Voice Agents to match brand tone, whether authoritative, friendly, empathetic, or high-energy. These expressive controls have become one of the most frequently requested user improvements and a major selling point in Thoughtly sales demos.

Results: Enterprise Voice Infrastructure That Converts

Since migrating to Cartesia as the default voice provider, Thoughtly has delivered measurable improvements across its platform:

• Sub-200ms end-to-end latency on live calls, enabling natural conversational turn-taking that keeps prospects engaged

• Voice clones generated in seconds from just 20–30 seconds of audio, accelerating enterprise onboarding and sales demos

• Highest-quality experience out of the box for new AI Voice Agents

• Advanced expressive controls over tone, speed, and delivery style — now a top-requested feature and sales demo highlight

For enterprise GTM teams, this translates into higher engagement on outbound calls, more natural lead qualification conversations, stronger brand trust during automated interactions, and better conversion performance at scale.

“Enterprise buyers are done tolerating robotic-sounding AI on their sales calls. The bar is moving fast, and having Cartesia as our default voice infrastructure means we're always ahead of it,” said Leonard.