Cartesia

State-space voice intelligence platform powering real-time conversational agents with sub-100ms TTS latency.

Cartesia is an autonomous voice AI and telephony agent platform starting at $0/month. It achieves an Autonomous Execution Score of 70/100 and integrates natively with WebSockets, LiveKit, Daily. Its key operational strength is unmatched sub-100ms audio generation speed, while primary tradeoffs include developer infrastructure requiring custom client implementation.

Autonomy: 70/100
Value: 5.01
From: $0/mo
Pricing: freemium
Updated: Nov 2026

Strengths

Unmatched sub-100ms audio generation speed
Native integration with LiveKit and Daily WebRTC stacks
Cost-effective per-character pricing

Tradeoffs

Developer infrastructure requiring custom client implementation
No hosted telephony portal

Integrations

WebSockets
LiveKit
Daily
API

Estimate your monthly cost

minutes per month

$30/mo

On the Pro plan. Voice agents duration billed at $0.03/min ($0.014/min telephony add-on for Cartesia phone number). TTS: 1 credit per char (~750-800 credits/min). STT: 3 credits per second (~$0.39/hr on Scale).

How this score is built

Autonomy base: (100 − 15 human effort) × 0.8
Integrations: +12
Setup friction: −10
Value inputs: 20 features, 4.9 rating

Human effort, feature count and rating are editorial estimates, not test results.

Evidence

Price checked Nov 2026. View source

Vendor states: HIPAA (Enterprise), GDPR (Enterprise).

Pricing tiers

Free

$0 /month

20K credits / month
$1 prepaid agents / month (~33 agent minutes)
Text to Speech (Sonic-3.6, ~27 min)
Speech to Text (Ink-2, ~1h 51m)
2 concurrent TTS requests, 8 concurrent STT requests

Pro

$5 /month

100K credits / month
$5 prepaid agents / month (~2h 47m)
Commercial use license
Instant voice cloning
3 concurrent TTS requests, 12 concurrent STT requests

Startup

$49 /month

1.25M credits / month
$49 prepaid agents / month (~27h 13m)
Pro voice cloning (2 slots)
Organizations support
5 concurrent TTS requests, 20 concurrent STT requests

Scale

$299 /month

8M credits / month
$299 prepaid agents / month (~166h 7m)
Priority support
High concurrency limits (15 TTS, 60 STT)
Pro voice cloning (4 slots)

Enterprise

Custom /custom

Custom credits & agent usage
Volume pricing
Custom concurrency limits
DPAs and BAAs for compliance
Shared Slack channel & SSO

Cartesia alternatives

Tool	Autonomy	Value	From	Compare
Deepgram Speech-to-text and conversational voice AI infrastructure delivering real-time transcription and voice agent APIs.	73	5.89	$0/mo	Compare ↗
Vapi Developer-first voice AI infrastructure for building ultra-low-latency calling agents.	73	7.01	$0/mo	Compare ↗
LiveKit End-to-end real-time multimodal WebRTC infrastructure powering sub-200ms voice AI agents.	72	7.52	$0/mo	Compare ↗
Dapta Speed-to-lead voice AI agent that automatically calls inbound web leads within 30 seconds to qualify and book meetings.	72	4.08	$99/mo	Compare ↗
Retell AI Voice engine for conversational AI with native speech-to-speech models and turn-taking logic.	72	5.40	$0/mo	Compare ↗
Daily Real-time voice and video APIs with optimized serverless runtimes for conversational AI bots.	71	6.63	$0/mo	Compare ↗

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