AI software · Cartesia
Promote Cartesia Sonic-3
Cartesia Sonic-3
Streaming text-to-speech API with expressive emotion, laughter, and ultra-low latency for voice agents in 40+ languages.
Partner summary
The offer at a glance
A quick read on buyer fit, pitch, economics, and promotion fit.
Best buyer
Voice agent developers
Main outcome
Sonic delivers time-to-first-audio in the 40–90 ms range, enabling conversational AI that feels human.
Commission
To be confirmed
Best channels
Content Marketing, Developer Communities, Newsletters, Technical Blogs
Terms
Stay within Cartesia's published claims for latency, language coverage, and compliance. Do not assert partnership, payout, or checkout arrangements that have not been confirmed by the founder.
Main pitch
Cartesia Sonic-3 is the streaming text-to-speech API for voice agents that actually sound human—laughing, emoting, and responding in well under a blink. With native voices in 40+...
Economics
Partner terms
Commission, pricing model, and review timing for this listing.
Commercial terms
Partner terms
Founder confirmation required before partners promote this listing.
- Commission
- To be confirmed
- Pricing
- Subscription
- Duration
- —
- Review period
- 30 days
Pricing tiers
Free
Primary$0.00/ month
Tracks Signup
- 20K credits for models
- $1 prepaid for agents
- Personal use
- Discord support
- Access to Sonic, Ink, and Line
Pro
$4.00/ month
Tracks Paid Subscription
- 100K credits for models
- $5 prepaid for agents
- Instant voice cloning
- Commercial use
- Billed yearly
Startup
$39.00/ month
Tracks Paid Subscription
- 1.25M credits for models
- $49 prepaid for agents
- Pro voice cloning
- Organization support
- Billed yearly
Scale
$239/ month
Tracks Paid Subscription
- 8M credits for models
- $299 prepaid for agents
- Priority support
- High concurrency limits
- Billed yearly
Enterprise
Custom/ custom
Tracks Enterprise Contract
- Custom supported models and agents
- Custom usage pricing
- Custom concurrency
- Enterprise support via Slack
- Enterprise-grade security and compliance (SOC 2 Type 2, HIPAA, PCI Level 1, SSO, custom SLAs)
Who this converts for
The buyers this offer is shaped for. Match your reach to the strongest audience fit.
Voice agent developers
Engineering teams at AI startups and product orgs building production voice agents that need low-latency, expressive TTS with SDKs and documented APIs.
Pain points
- Existing TTS models sound robotic and break the illusion of a real conversation
- Latency budgets are tight and most providers exceed acceptable time-to-first-audio
- Need expressive controls like emotion and laughter without bolting on extra systems
- Multilingual coverage is shallow or low-quality for non-English markets
- Robotic-sounding voices break the illusion of a real conversation
- Latency exceeds the budget for real-time voice agents
- Multilingual TTS coverage is shallow or non-native
- Compliance gaps block deployments in healthcare, finance, and customer service
- Stitching together STT, TTS, and orchestration vendors slows shipping
Desired outcomes
- Ship a voice agent that feels natural and human
- Hit sub-100 ms time-to-first-audio in production
- Cover global markets with native-sounding voices
- Move quickly from prototype to scaled deployment
- Voice agents that sound human and engaging
- Sub-100 ms time-to-first-audio at global P99
- Native-quality voices in 40+ languages
- HIPAA, SOC 2 Type 2, and PCI-aware deployments
- Faster iteration on a consolidated voice stack
Enterprise voice and contact-center buyers
Enterprise product, contact-center, and platform leaders deploying voice AI for customer service, healthcare, sales, and recruiting workflows that require compliance and scale.
Pain points
- Need HIPAA, SOC 2 Type 2, and PCI controls before deploying voice AI
- High call volumes require dependable concurrency and low-latency at P99
- Hold times and IVR menus frustrate customers and inflate cost-to-serve
- Vendor sprawl across STT, TTS, and orchestration slows rollout
Desired outcomes
- Replace IVR menus and reduce hold times with natural voice agents
- Lower contact-center operating cost while improving CSAT
- Deploy in-VPC or via secure API to meet compliance requirements
- Consolidate STT, TTS, and agent orchestration on one stack
Healthcare digital experience teams
Digital and operations teams at provider groups, payers, and healthtech startups automating patient communication, scheduling, intake, and benefits eligibility with HIPAA-aware voice AI.
Pain points
- Front-desk staff overwhelmed by routine scheduling, refill, and benefits calls
- Patients abandon calls due to long holds and complex phone menus
- Manual EHR documentation drains physician time
- Strict HIPAA requirements rule out many TTS vendors
Desired outcomes
- Provide warm, natural-sounding patient-facing voice agents
- Reduce operational cost and free clinical staff
- Automate intake and follow-up while keeping records in EHR/EMR
- Deploy compliantly with HIPAA controls
Product and engineering teams building production voice agents at AI startups
Help product and engineering teams ship voice agents that sound human, respond in real time, and meet enterprise compliance requirements across global markets.
Help product and engineering teams ship voice agents that sound human, respond in real time, and meet enterprise compliance requirements across global markets
Help product and engineering teams ship voice agents that sound human, respond in real time, and meet enterprise compliance requirements across global markets.
expressive TTS with enterprise compliance and global language coverage
Help product and engineering teams ship voice agents that sound human, respond in real time, and meet enterprise compliance requirements across global markets.
Why partners convert here
When to pitch this, and the outcomes the buyer actually gets.
Use cases
- Real-time voice agents for customer support
- Real-time voice agents for customer support
- Multilingual voice experiences in 40+ languages
- Multilingual voice experiences in 40+ languages
- HIPAA-aware voice agents for healthcare
- HIPAA-aware voice agents for healthcare
- Branded voices with instant and pro voice cloning
- Branded voices with instant and pro voice cloning
- Code-first voice agent development with Line
- Code-first voice agent development with Line
Outcomes
Enterprise-grade compliance posture with SOC 2 Type 2, HIPAA, and PCI Level 1, plus secure API or managed in-VPC deployment options.
EvidenceVoice agents that sound human and engaging
Native-quality voices in 40+ languages
HIPAA, SOC 2 Type 2, and PCI-aware deployments
Faster iteration on a consolidated voice stack
Sonic-3 streaming TTS with laughter and emotion in 40+ languages
EvidenceSub-100 ms time-to-first-audio positioning
EvidenceHealthcare customer outcomes (Assort Health, Hello Patient, Arini)
EvidenceEnterprise compliance posture
EvidenceCustomer logos and quotes (ServiceNow, Goodcall, Maven AGI, Daily, Quora, Together, Tavus)
EvidenceBefore · After
Real-time voice agents for customer support
Before
Customers wait on hold or navigate brittle IVR menus while existing voicebots sound robotic and drop digits in critical details like order IDs and amounts.
After
Sonic-3 delivers fluid, human-sounding voice with sub-100 ms latency, accurate handling of acronyms and initialisms, and expressive emotion that keeps callers engaged.
Expected outcome: Lower hold times, higher containment, and improved CSAT for inbound voice support.
What makes this different
Where this offer beats the alternatives.
Streaming TTS with expressive emotion tags and laughter
Time-to-first-audio as low as 40–90 ms with consistent global P50–P99
Native voices in 40+ languages including 9 Indian languages
Fully-owned voice stack: Sonic-3 TTS, Ink STT, and Line agent platform
Enterprise compliance posture: SOC 2 Type 2, HIPAA, PCI Level 1, SSO, in-VPC deployment
Instant 10-second voice cloning plus fine-tuned Pro Voice Clones
Promotion strategy
Partner playbook
Angles, questions, objections, and inputs to keep outreach sharp.
Value proposition
Streaming text-to-speech API with expressive emotion, laughter, and ultra-low latency for voice agents in 40+ languages.
How to pitch
Cartesia Sonic-3 is the streaming text-to-speech API for voice agents that actually sound human—laughing, emoting, and responding in well under a blink. With native voices in 40+ languages, instant and pro voice cloning, and a developer-first stack that includes Ink STT and the Line agent platform, teams can move from prototype to production voice AI on one fully owned, SOC 2 / HIPAA / PCI-compliant infrastructure.
Positioning
The fastest, most expressive streaming TTS for real-time voice agents, paired with an end-to-end voice agent development stack.
Best angles to test
- Sub-100 ms latency as the headline differentiator for voice agent builders
- Emotion and laughter as the unlock for natural-sounding conversations
- Multilingual native voices for global product expansion
- HIPAA-aware voice AI for healthcare operators
- Code-first Line platform vs closed voicebot builders
- Sonic-3 is a streaming text-to-speech API with emotion and laughter
- Native voices in 40+ languages including 9 Indian languages
- Time-to-first-audio under 90 ms as published by Cartesia
- Instant voice cloning in roughly 10 seconds plus Pro Voice Cloning
- SOC 2 Type 2, HIPAA, and PCI Level 1 compliance as listed on Cartesia's site
- Free, Pro, Startup, Scale, and Enterprise plans with usage credits
Angles to avoid
- Do not claim guaranteed revenue or savings
- Do not claim results are typical
- Do not claim official partnership before founder approval
- Do not claim Stripe-verified payouts
- Do not claim managed checkout is ready
- Do not invent latency numbers beyond what Cartesia publicly states
- Do not claim specific compliance certifications beyond SOC 2 Type 2, HIPAA, and PCI Level 1 as listed on the site
Discovery questions
- What latency budget do you currently have for time-to-first-audio in your voice product?
- Which languages and regions are you targeting in the next 12 months?
- Do you need HIPAA, SOC 2 Type 2, or PCI compliance for your deployment?
- Are you bringing your own LLM and tool-calling stack, or starting fresh?
- Where in the funnel do callers drop off today, and how do voice quality and wait time contribute?
Disqualifiers
- Teams that only need offline batch voiceover
- fully no-code visual builders
- or zero-compliance deployments where streaming and enterprise controls are not required.
Target keywords
Objections & responses
“How is Sonic different from other TTS APIs we already evaluated?”
Response: Sonic-3 is positioned as the only streaming TTS that combines expressive emotion and laughter with sub-100 ms time-to-first-audio and 40+ native languages, paired with Cartesia's own Ink STT and Line agent platform on one owned stack.
“Will the latency hold up at scale and outside the US?”
Response: Cartesia publishes consistent P50–P99 latency claims from San Francisco to Tokyo and offers in-VPC managed deployments for enterprise workloads that need predictable performance.
“Can we use this in regulated industries like healthcare or finance?”
Response: Cartesia's site lists SOC 2 Type 2, HIPAA, and PCI Level 1 controls with SSO and managed in-VPC deployment, with healthcare partners cited as live references; specific compliance fit should be confirmed with Cartesia sales.
“We already have an LLM-driven agent stack—why add another vendor?”
Response: Sonic-3 plugs into existing reasoning systems via API and SDK, and Line lets teams keep their own LLM and tool-calling backends while consolidating voice infrastructure on Cartesia's owned models.
“Is there a free way to evaluate before committing?”
Response: Cartesia offers a Free plan with 20K credits for models plus a $1 prepaid agent balance, plus a Playground to test scripts and voices in the browser.
Rules
Promotion rules
Where you can promote, what is restricted, and what the founder requires.
Allowed channels
Restricted channels
- AI-generated content
- Yes
- Content reuse
- No
- Founder approval
- Yes
Approved claims
- Sonic-3 is a streaming text-to-speech API with emotion and laughter
- Native voices in 40+ languages including 9 Indian languages
- Time-to-first-audio under 90 ms as published by Cartesia
- Instant voice cloning in roughly 10 seconds plus Pro Voice Cloning
- SOC 2 Type 2, HIPAA, and PCI Level 1 compliance as listed on Cartesia's site
- Free, Pro, Startup, Scale, and Enterprise plans with usage credits
Claims to avoid
- Do not claim guaranteed revenue or savings
- Do not claim results are typical
- Do not claim official partnership before founder approval
- Do not claim Stripe-verified payouts
- Do not claim managed checkout is ready
- Do not invent latency numbers beyond what Cartesia publicly states
- Do not claim specific compliance certifications beyond SOC 2 Type 2, HIPAA, and PCI Level 1 as listed on the site
Compliance notes
- Stay within Cartesia's published claims for latency, language coverage, and compliance. Do not assert partnership, payout, or checkout arrangements that have not been confirmed by the founder.
Evidence
Proof & trust signals
Claims, evidence links, and operational trust signals partners can lean on.
Proof points
- time_to_first_audio_ms: 90 ms
- language_coverage: 40 languages
- operational_cost_savings: 63 percent
- Enterprise-grade compliance posture with SOC 2 Type 2, HIPAA, and PCI Level 1, plus secure API or managed in-VPC deployment options.
- Voice agents that sound human and engaging
- Native-quality voices in 40+ languages
- HIPAA, SOC 2 Type 2, and PCI-aware deployments
- Faster iteration on a consolidated voice stack
- Sonic-3 streaming TTS with laughter and emotion in 40+ languages
- Sub-100 ms time-to-first-audio positioning
- Healthcare customer outcomes (Assort Health, Hello Patient, Arini)
- Enterprise compliance posture
- Customer logos and quotes (ServiceNow, Goodcall, Maven AGI, Daily, Quora, Together, Tavus)
Proof links
- Cartesia Sonic-3 hero image
Open Graph image for the Cartesia Sonic-3 product page.
- Cartesia Line and platform image
Open Graph image used across Cartesia's Line, pricing, healthcare, and contact pages.
- Cartesia logo
Primary Cartesia logo candidate from the public site.
About Cartesia
Sonic-3 is Cartesia's flagship streaming TTS API for building voice agents and real-time interactive apps. It generates natural, expressive speech with emotion tags and laughter, ships native voices in 40+ languages including 9 Indian languages, and supports instant 10-second voice cloning plus fine-tuned Pro Voice Clones. Time-to-first-audio is advertised as low as 40–90 ms, with consistent P50–P99 latency globally. Sonic-3 is paired with Cartesia's Ink streaming STT and Line voice-agent development platform on a fully-owned stack offering secure API or managed in-VPC deployment, SOC 2 Type 2, HIPAA, and PCI Level 1 controls.
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Listing transparency
Company activation will confirm the remaining commercial and tracking details.