Cartesia vs Speechify
Discover the key differences between Cartesia and Speechify voice AI models. Learn about their features and pricing.
VS
Comparing Cartesia and Speechify Voice AI Models
Cartesia offers ultra-fast voice generation with a latency of just 90 ms, ensuring real-time interactions. Its voices are ultra-realistic with no hallucinations, providing clarity and authenticity for various 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
26 languages with extensive dialect coverage
Up to 15 on highest self serve tier, custom for enterprise
Speechify
sub-250ms
Less depth and reliability ratings in human evals
Limited character count for longer texts
Requires 20 seconds of audio
Requires several hours of voice data
IPA Support, isolated pronunciation
Stability, similarity, and style exaggeration controls
8kHz audio
None
60
Limited concurrent usage options
Voice Quality Comparison
In terms of voice quality, Cartesia consistently outshines its competitors. It has been rated higher in human evaluations for naturalness and realism. Cartesia's Sonic model achieves a quality score of 4.7 out of 5 in independent evaluations, compared to Speechify's lower ratings. This is supported by a 20% lower validation perplexity and a 2x lower word error rate in downstream evaluations. Cartesia's commitment to high-quality voice generation makes it a preferred choice for applications requiring lifelike speech.
Latency Performance
Evaluating latency using the Time to First Audio (TTFA) metric, Cartesia's Sonic model demonstrates impressive performance with a TTFA of just 199 ms. This is significantly faster than Speechify, which has a TTFA of 832 ms at the self-serve tier. Cartesia's architecture, based on State Space Models (SSMs), allows for superior latency optimization compared to traditional transformer architectures. This efficiency ensures that users experience near-instantaneous audio responses, crucial for real-time 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 Speechify, which may produce distorted outputs under certain conditions. Cartesia's advanced algorithms maintain the integrity of the original audio, providing users with reliable and high-quality voice outputs. This focus on accuracy and clarity is essential for applications where voice fidelity is paramount.
Voice Cloning Showdown
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, Speechify imposes restrictions on 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, its voice mixing and design capabilities provide a wider range of diverse voices.
Voice Design Controllability
Cartesia stands out with its unique voice design controllability features, offering emotion and speed modulation options. This allows users to make refined adjustments while keeping the audio natural and seamless. Additionally, Cartesia enables localization of voices to match different accents, enhancing versatility. In contrast, Speechify offers limited control options, focusing mainly on stability and similarity without the nuanced adjustments available in Cartesia's platform.
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 provides high-fidelity voice cloning with unmatched accuracy.
Ultra-Realistic Voices
Experience lifelike voices that are nearly indistinguishable from human speech.
No Hallucinations
Enjoy crystal-clear audio with no distortions or errors in voice generation.
Explore Pricing for Cartesia and Speechify
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
Speechify
10 standard reading voices, listen anywhere
200+ high quality voices, 60+ languages
Access to all features, priority support
Unlimited access, advanced features
Custom solutions, dedicated support
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."
