Cartesia vs WellSaid
Discover the key differences between Cartesia and WellSaid voice AI models. Explore features, pricing, and performance metrics.
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Compare Cartesia and WellSaid Voice AI Models
Both platforms offer advanced voice AI capabilities, but Cartesia excels with ultra-fast voice generation and lifelike quality, ensuring no hallucinations. With a latency of just 90ms, it outperforms many competitors in real-time applications.
Updated at:
Feb 14, 2025
Features
Cartesia
90 ms + network time
Consistently rated as more natural, expressive, and realistic in blinded human evaluations
Infinite request length
Requires 5-10 seconds of audio
IPA Support, strong contextual understanding
Slider control for speed and emotion + synthetic voice mixing and design
8kHz audio, telephony optimized voices
Real-time generation on-device
31 languages with extensive dialect coverage
Up to 15 on highest self serve tier, custom for enterprise
WellSaid
Higher latency, impacting responsiveness
Others may lack the same depth and reliability.
Limited character count for longer texts
Not supported
Not supported
Some may show less contextual awareness.
Others may not offer the same level of control.
Some may not be optimized for telephony.
Limited on-device capabilities elsewhere.
20
Limited concurrent usage options
Voice Quality Evaluation
In terms of voice quality, Cartesia consistently outperforms WellSaid. Cartesia's Sonic model has been rated highly in independent evaluations, achieving a score of 4.7 out of 5 for overall quality. This is significantly higher than WellSaid's score of 4.38. Cartesia's voices are recognized for their naturalness and emotional sensitivity, making them ideal for real-time applications. Furthermore, Cartesia's architecture allows for better contextual understanding, resulting in clearer and more engaging audio outputs.
Latency Performance Review
Latency is a critical factor in voice AI applications. Cartesia measures latency using the Time to First Audio (TTFA) metric, achieving an impressive TTFA of 199 ms. This is significantly faster than WellSaid, which has a TTFA of 832 ms. Cartesia's Sonic model is built on State Space Models (SSMs), allowing for greater latency optimization compared to traditional transformer architectures. This efficiency ensures that Cartesia can deliver real-time responses, enhancing user experience in conversational AI applications.
Hallucination Rate Analysis
Cartesia's voice cloning technology boasts a no hallucination feature, ensuring that the generated audio is clear and authentic. This is a significant advantage over WellSaid, which may experience occasional distortions in voice outputs. Cartesia's advanced algorithms eliminate errors and maintain the integrity of the original voice, providing users with high-fidelity audio. This reliability is crucial for applications in healthcare and customer support, where clarity and accuracy are paramount.
Voice Cloning Comparison
When it comes to voice cloning, Cartesia excels with its ability to create an instant clone from just 5 seconds of audio. This feature allows for unlimited instant voice cloning, making it a powerful tool for developers. In contrast, WellSaid restricts cloning capabilities, requiring longer audio samples. Cartesia's advanced embedding technology ensures high-quality voice clones that maintain accents and voice quality, even in noisy conditions. Additionally, Cartesia offers voice mixing and design capabilities, providing a diverse range of voices for various applications.
Voice Design Controllability
Cartesia stands out in voice design controllability, offering unique features such as emotion and speed modulation. This allows users to make refined voice adjustments while maintaining a natural sound. Additionally, Cartesia enables localization, allowing voices to adapt to different accents seamlessly. In contrast, WellSaid provides limited control options, focusing primarily on stability and similarity without the nuanced adjustments available in Cartesia's offerings.
Cartesia - Advanced AI Voice Capabilities
Cartesia AI offers the fastest voice model with hallucination-free, ultra-realistic voice generation and cloning.
High-Quality Voice Cloning
Cartesia offers high-quality voice cloning with unmatched accuracy.
Ultra-Realistic Voices
Experience lifelike voices that are nearly indistinguishable from human speech.
No Hallucinations
Cartesia ensures crystal-clear audio with no distortions or errors.
Explore Pricing for Cartesia and WellSaid
Cartesia
Free - $0/mo. per month with 10k free credits
Pro - $5/mo. per month with 100k credits
Startup - $49/mo. per month with 1.25M credits
Scale - $299/mo. per month with 8M credits
Enterprise - trusted by Fortune 500 companies
WellSaid
Includes basic features and limited usage.
Offers additional features and higher limits.
Ideal for growing businesses with more needs.
Designed for larger enterprises with extensive usage.
Custom pricing and features for large organizations.
What Cartesia customers say
Join the growing list of companies opting for Sonic.
"This partnership represents a transformative moment in enterprise AI adoption," said Melissa Gordon, CEO of Rasa. "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."
"We're thrilled to partner with Cartesia - their technology has dramatically improved the accuracy and reliability of our call center agents. Beyond just providing best-in-class voice AI, the Cartesia team has been a true partner in helping us transform 24/7 patient support for over 215,000 patients. Their support has been instrumental in making exceptional care accessible anytime, anywhere."
Jeffrey Liu, Founder and co-CEO, Assort Health
"Together AI's mission has always been to provide developers with the most powerful and efficient tools for building AI applications," says Vipul Ved Prakash, Together AI's CEO. "Cartesia is leading the charge of building efficient, multimodal models from first principles, starting with their Sonic TTS model. By integrating Sonic into our platform, we're enabling developers to create sophisticated multi-modal applications that leverage the most advanced and lowest latency voice model available today, all while maintaining the simplicity and reliability our users expect."
