Cartesia is live · free plan, paid from $5/mo · last verified 24 Oct 2026 · viability healthy
Cartesia
Real-time text-to-speech, streaming speech-to-text and a managed runtime for shipping live voice agents
We'd start here when the failure mode is latency or a misheard account number, not when you need a batch transcript. Ink-2's keyterm prompting plus agent-grade turn detection is a genuinely different pitch from a generic STT endpoint, and keeping telephony, concurrency and call analytics under one vendor removes an integration step. Budget the $0.06/min call duration and $0.014/min telephony as real line items.
Verdict generatedVerified 5d ago · liveness 76/100 · cite: rightaichoice.com/tools/cartesia
- Enterprise voice agents in finance, healthcare, government and customer support
- Real-time fraud detection and outbound verification calls where latency is the constraint
- Teams that want TTS, STT and agent orchestration from a single vendor
- Organizations with data residency rules needing cloud, on-premise or on-device deployment
- Batch transcription or overnight voiceover jobs where real-time latency buys nothing
- Teams that want ready-made CRM and helpdesk connectors rather than an API to build on
- Buyers who need one predictable monthly bill — model credits and prepaid agent dollars are separate pools
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Skip Cartesia if you need only a batch transcription endpoint or a one-off voiceover MP3 — the per-minute agent and telephony charges are wasted on you.
Every agent call costs $0.06 per minute on top of your plan, so 500 minutes of calls adds $30 to whatever tier you bought.
At $5/mo Pro, Cartesia is cheaper than most competing speech APIs for a first production prototype, and the $49/mo Startup tier undercuts enterprise voice-agent platforms by an order of magnitude. Real cost is usage-shaped: $0.06/min calls plus $0.014/min telephony stack on every tier, so a high-volume dialer can outspend its plan several times over.
In short
Cartesia — Real-time text-to-speech, streaming speech-to-text and a managed runtime for shipping live voice agents. Best for Enterprise voice agents in finance, healthcare, government and customer support, Real-time fraud detection and outbound verification calls where latency is the constraint, Teams that want TTS, STT and agent orchestration from a single vendor. Free to start; paid plans from $5/mo.
No head-to-head comparison for Cartesia yet — the alternatives below are the closest matches we list.
What is Cartesia?
Cartesia — Real-time text-to-speech, streaming speech-to-text and a managed runtime for shipping live voice agents. Best for Enterprise voice agents in finance, healthcare, government and customer support, Real-time fraud detection and outbound verification calls where latency is the constraint, Teams that want TTS, STT and agent orchestration from a single vendor. Free to start; paid plans from $5/mo.
Cartesia sells three things that usually come from three vendors: Sonic-3.6 for real-time text-to-speech, Ink-2 for streaming speech-to-text, and Managed Agents, the runtime where the agent actually runs. Sonic-3.6, shipped August 2026, is preferred in up to 93% of blind head-to-head tests across 15 locales. Ink-2 launched July 2026 and took the #1 spot on Artificial Analysis' streaming leaderboard, then added keyterm prompting for product names and account IDs plus configurable turn detection so you can tune endpointing toward speed or accuracy. September 2026 brought Multilingual Voices: 50+ library voices speaking up to 25 languages natively, with multilingual cloning alongside. The agent layer is what separates Cartesia from a pure model API. Managed Agents provisions phone numbers, caps concurrent calls per tier, and tracks call analytics. Call duration bills at $0.06 per minute, with $0.014 per minute telephony on Cartesia-provided numbers. TTS, STT and agent concurrency run in separate pools, so a heavy synthesis workload never eats your call capacity. The underlying research is state space models (Mamba, Mamba-3, H-Nets), aimed at keeping latency low as volume climbs. Deployment spans regional cloud API endpoints, on-premise, and on-device, with inference running in-region for data residency and compliance. Enterprise adds DPAs, BAAs, SSO and custom concurrency; Cartesia holds SOC 2 Type II. Pricing is credits for models plus a separate prepaid agent dollar allowance on each tier, with unlimited workspace seats. Against ElevenLabs and Deepgram the difference is scope: Cartesia hands you the speech models and the agent runtime they feed.
Key features
- Real-time text-to-speech with Sonic-3.6, preferred in up to 93% of blind tests across 15 locales
- Streaming speech-to-text with Ink-2, #1 on Artificial Analysis' streaming leaderboard
- Keyterm prompting for domain-specific entities in transcription
- Configurable turn detection to trade endpointing speed against accuracy
- Multilingual Voices: 50+ library voices speaking up to 25 languages natively
- Multilingual voice cloning across languages
- Instant voice cloning on Pro and above
- Professional voice cloning with custom voices on Startup and above
- Localizing a voice to a new accent at 225 credits per added accent
- Managed Agents platform for shipping production voice agents
- Cartesia-provisioned phone numbers for inbound and outbound calls
- Call analytics on voice agents
- Call duration billed at $0.06 per minute plus $0.014 per minute telephony
- Separate concurrency pools for TTS, STT and agents
- Cloud API, on-premise and on-device deployment with in-region inference
Behind the verdict
The pitch that lands is narrow and useful: one vendor for the ears, the mouth, and the phone line. Most teams building voice agents end up stitching a TTS API to an STT API to a telephony provider and then debugging the seams, usually at the exact moment a customer is on the line. Cartesia collapses that. Pick it when your agent is customer-facing and latency-sensitive — inbound support, outbound verification, anything where a caller notices a pause. The separate concurrency pools matter more than they sound. In practice we've seen teams throttle transcription because synthesis traffic spiked, and Cartesia's design avoids that fight. Pass on it for batch work. Overnight transcription, podcast cleanup, one-off voiceover files — you're paying for real-time machinery that buys you nothing. Creators who want a polished studio UI should look at ElevenLabs instead; Cartesia is a build-it-yourself platform. Closest alternative is Deepgram if you only need a transcription endpoint, or ElevenLabs if TTS quality alone is the decision. Neither sells the agent runtime bundled the same way, which is the actual argument for Cartesia. The caveat is billing shape. Credits for models and prepaid agent dollars are two separate pools per tier, so your monthly number moves with usage and you'll want the cost calculator before committing. High-volume agent deployments should model call minutes early — at $0.06 per minute, 10,000 calls of three minutes is a real line item. Multilingual Voices, live since September 2026, is worth testing if you're shipping across locales. 50+ voices covering up to 25 languages natively beats re-recording per market.
Models under the hood
as of 2026-10-23
Limitations
- Cartesia bills on two separate meters — model credits and prepaid voice agent dollars — so estimating a monthly total means forecasting both your TTS/STT volume and your call minutes.
- Plans start at Free ($0, 20K credits/mo plus $1 prepaid agents/mo) and climb to Scale at $299/mo with 8M credits, with Enterprise custom volume pricing.
- Commercial use licensing only begins at Pro ($5/mo), and professional voice cloning requires Startup ($49/mo) or above.
- Concurrency and custom limits are tier-gated (high concurrency at Scale, custom concurrency only at Enterprise) rather than purchasable separately.
as of 2026-10-20
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Is Cartesia still active?
Cartesia is live · free plan, paid from $5/mo · last verified 24 Oct 2026 · viability healthy.
Viability score
How well maintained and how widely used is Cartesia? Built from what the vendor actually publishes (docs, changelog, tutorials, integrations, pricing), whether the site is live, and how much real users discuss it. How we calculate this
Last calculated: October 2026
How we score →What's new in Cartesia
Checked 10 days agoAcross the latest 5 updates: 1 feature update, 3 launches and 1 news mention.
Raise Financial Services x Cartesia: Voice AI for Financial Access in India
Cartesia and Raise Financial Services announced a partnership to bring voice AI to financial access in India, extending Cartesia's finance vertical into a new market.
Introducing Multilingual Voices
Multilingual Voices adds 50+ library voices that speak up to 25 languages natively, plus support for multilingual voice cloning.
Introducing Sonic-3.6
Sonic-3.6 improves on Sonic-3.5 in naturalness and quality, and is preferred in up to 93% of blind head-to-head tests across 15 locales.
New to Ink-2: keyterm prompting and configurable turn detection
Ink-2 adds keyterm prompting for domain-specific entities and configurable turn detection so you can tune endpointing for speed or accuracy.
Introducing Ink-2: The #1-ranked STT built for voice agents
Ink-2 speech-to-text launched, ranked #1 on Artificial Analysis' streaming leaderboard with built-in turn detection.
What do users say about Cartesia?
What people actually say about Cartesia — is it worth it?
We scanned public community sources for Cartesia on Oct 9, 2026 and could not establish that the discussion we found is about this tool rather than something else sharing its name. Only 2 of the posts we fetched could be positively tied to Cartesia. Rather than publish a sentiment score built on the wrong subject, we publish nothing here and re-run the scan.
How we verified this
Every listed fact about Cartesia— pricing, features, links, status — is re-read from the vendor's own pages by our verification pipeline and each change is logged with a date; the last pass ran on 24 Oct 2026. Pages mix model-assisted synthesis with human review; see how we verify.
Verification history
We have re-verified Cartesia 20 times since . Each pass re-reads the vendor's own pages and re-checks every listed field against that evidence; passes where nothing had changed are marked as such.
- — changed summary, our verdict, who should skip it, pricing tiers, features, who it suits, description, SSL certificate
- — changed limitations
- — changed who should skip it, description, our verdict, summary, features, hidden costs, setup time, limitations, who it suits, pricing fit, switching in, switching out, models, pricing tiers
- — changed features, who should skip it, pricing tiers, who it suits, summary, our verdict, description
- — changed pricing page
- — changed who it suits, our verdict, features, who should skip it, summary, description, pricing tiers
Showing the 6 most recent of 20 verification passes.
Free to cite with attribution — this page re-verifies continuously.
How much does Cartesia cost in 2026?
Cartesia: Free to start; paid plans from $5/mo. Pricing last verified 24 Oct 2026.
Plans compared
Every published Cartesia tier, its price as the vendor publishes it, who it fits, and what it adds over the tier below. The 12-month cost projection follows.
| Plan | Price | Billing | Who it's for |
|---|---|---|---|
| Free | Free | — | A developer evaluating Sonic-3.6 and Ink-2 latency before committing, or testing one phone agent with the $1 prepaid allowance.Adds: Free entry point: 20K credits/month (~27 TTS minutes, ~1h 51m STT), $1/mo agent dollars, 2 concurrent TTS requests and 1 Cartesia number. |
| Pro | $5/mo | monthly | A solo developer or small team putting a first voice feature into production with commercial rights.Adds: Adds a commercial use license and instant voice cloning, and raises credits to 100K/month with 3 concurrent TTS requests. |
| Startup | $49/mo | monthly | A funded startup shipping a customer-facing voice agent that needs custom voices and real call volume.Adds: Adds professional voice cloning (2 voices) and jumps to 1.25M credits/month — roughly 1,667 TTS minutes and 13h 37m of agent calls. |
| Scale | $299/mo | monthly | A team running production call traffic that needs high concurrency and prioritised support.Adds: Adds priority support and professional voice cloning for 4 voices, with 8M credits/month and 15 concurrent TTS requests. |
| Enterprise | Custom | quote | Regulated organizations in finance, healthcare or government that need BAAs, SSO and custom concurrency ceilings.Adds: Adds DPAs and BAAs, SSO, security questionnaires, a shared Slack channel and volume pricing with custom concurrency limits. |
12-month cost
Project the real annual outlay, including the implied monthly cost when only an annual tier is published.
Vendor list price only. Add-on usage, seat overages, and contract minimums are surfaced under Hidden costs & gotchas.
Where the pricing makes sense
The company stage and team size where Cartesia's pricing actually pencils out — and where peers do it cheaper.
At $5/mo Pro, Cartesia is cheaper than most competing speech APIs for a first production prototype, and the $49/mo Startup tier undercuts enterprise voice-agent platforms by an order of magnitude. Real cost is usage-shaped: $0.06/min calls plus $0.014/min telephony stack on every tier, so a high-volume dialer can outspend its plan several times over.
Has Cartesia's pricing changed?
No plan price for Cartesia has moved since we began logging in Aug 2026; the pricing page is re-read on every verification pass.
Who should pick Cartesia?
Pick Cartesia if you are Enterprise voice agents in finance, healthcare, government and customer support, Real-time fraud detection and outbound verification calls where latency is the constraint, Teams that want TTS, STT and agent orchestration from a single vendor, Organizations with data residency rules needing cloud, on-premise or on-device deployment.
Look elsewhere if you are Batch transcription or overnight voiceover jobs where real-time latency buys nothing, Teams that want ready-made CRM and helpdesk connectors rather than an API to build on, Buyers who need one predictable monthly bill — model credits and prepaid agent dollars are separate pools, Creators who just need a one-off MP3 and will never touch voice agents.
Skip it if Skip Cartesia if you need only a batch transcription endpoint or a one-off voiceover MP3 — the per-minute agent and telephony charges are wasted on you.
GeneratedReal-world workflow fit
Concrete scenarios for the personas Cartesia actually fits — and what changes day-one when you adopt it.
You wire Ink-2 streaming transcription with keyterm prompting seeded with account and ticker names, point it at Managed Agents with a Cartesia phone number, and test outbound verification calls at $0.06/min on the Free tier's $1 allowance.
Outcome: A working outbound verification call in an afternoon, with concurrency and call analytics already handled rather than built.
You pick from the Multilingual Voices library so one agent covers English, Spanish and Japanese callers, then use call analytics in Managed Agents to see where calls drop.
Outcome: One agent and one vendor contract for a multilingual support line, with per-call cost visible at $0.06/min plus telephony.
You deploy Sonic-3.6 and Ink-2 via on-premise VPC so patient audio never leaves the building, and negotiate custom concurrency with DPAs and a BAA on Enterprise.
Outcome: A voice agent that satisfies data residency, with inference in-region and concurrency ceilings sized to your call volume.
Use cases
- Deploy a real-time voice agent for customer support or IVR that answers without awkward pauses.
- Run outbound verification calls on suspicious transactions with step-up authentication.
- Give game NPCs dialogue with emotion and laughter driven by Sonic-3.6.
- Build a multilingual accessibility narrator that reads with expression in real time.
- Stand up a conversational sales dialer using cloned voices for personalized outreach.
- Ship a voice agent with telephony and call analytics through Managed Agents.
- Run on-premise voice assistants for healthcare patient check-ins where audio cannot leave the building.
Setup time & first value
How long it actually takes to get something useful out of Cartesia — broken out by persona, not the marketing-page minute.
Free-tier API key to first Sonic-3.6 audio is minutes. A full Managed Agents phone agent with a provisioned number and call analytics is a day or two. Enterprise VPC or on-device deployment with DPAs and custom concurrency runs weeks and depends on your security review.
Switching to or from Cartesia
How to bring data in from common predecessors and how to get it back out — written for the switcher, not the buyer.
- →From ElevenLabs: swap the TTS endpoint to Sonic-3.6, re-create voices with instant cloning on Pro, and move agent logic into Managed Agents.
- →From Deepgram: replace the streaming STT endpoint with Ink-2, re-add domain terms as keyterm prompts, and pick up telephony and analytics in Managed Agents.
- →From a stitched TTS + Twilio + LLM stack: consolidate the call leg into Managed Agents, which provisions numbers and meters calls at $0.06/min.
- →From an in-house streaming pipeline: use Cartesia's separate TTS, STT and agent concurrency pools to migrate one workload at a time.
- ↗To ElevenLabs: keep agent logic, swap Sonic-3.6 for ElevenLabs voices, and move telephony to your own provider.
- ↗To Deepgram: move streaming STT back to a transcription-only endpoint and rebuild turn detection yourself.
- ↗To a cloud telephony stack: export call analytics, then re-provision numbers outside Managed Agents and pay telephony directly.
Resources & guides
- Resourcedocs.cartesia.ai
Welcome to Cartesia
Our API enables developers to build real-time, multimodal AI experiences that feel natural and responsive.
- Quickstartdocs.cartesia.ai
Realtime Text To Speech
Get up and running fast from docs.cartesia.ai
- Resourcedocs.cartesia.ai
Custom Voices
Helpful link from docs.cartesia.ai
- Resourcedocs.cartesia.ai
API Status and Version
Helpful link from docs.cartesia.ai
- Examplesdocs.cartesia.ai
Generate to File
Use generate() and write_to_file() to write a wav file.
- Resourcedocs.cartesia.ai
Self Hosted Deployments
Helpful link from docs.cartesia.ai
- Learncartesia.ai
Learn
Generate seamless speech, power voice applications, and fine-tune your own voice models on the fastest real-time AI platform.
- Resourcecartesia.ai
Blog
Generate seamless speech, power voice applications, and fine-tune your own voice models on the fastest real-time AI platform.
Tutorials & Learning
YouTube returned 6 videos for “Cartesia”, and we withheld 6: 6 could not be judged, because “Cartesia” is a single word that other videos use for other things. We are showing none, because we could not prove any of them are about Cartesia.
Official links
What are the best Cartesia alternatives?
The closest alternatives to Cartesia we list are ElevenLabs, Typecast AI and Smallest.ai. Ranked by direct product-type match, not category overlap.
| Alternative | Pricing | Starts at | Last verified |
|---|---|---|---|
| ElevenLabs | Freemium | Pricing not published | — |
| Typecast AI | Freemium | Pricing not published | — |
| Smallest.ai | Freemium | Pricing not published | — |
Alternatives to Cartesia
View allElevenLabs
Text to speech, voice cloning and conversational voice agents across 90+ languages on one shared credit balance.
Typecast AI
Typecast's text-to-speech API delivers Smart Emotion voices and streaming TTS at 170-210ms for real-time agents.
Smallest.ai
Smallest.ai delivers realtime text-to-speech, speech-to-text, speech-to-speech and voice agents on one developer API.
Tools that pair well with Cartesia
Common stack mates teams adopt alongside Cartesia, with the specific reason each pairing earns its keep.
ElevenLabs
Text to speech, voice cloning and conversational voice agents across 90+ languages on one shared credit balance.
Typecast AI
Typecast's text-to-speech API delivers Smart Emotion voices and streaming TTS at 170-210ms for real-time agents.
Smallest.ai
Smallest.ai delivers realtime text-to-speech, speech-to-text, speech-to-speech and voice agents on one developer API.
Frequently asked questions
Best-of guides
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