No. 18 of 215 ·Text-to-Speech Software

Cartesia Sonic

Web · API · paid plans from $5/mo

Freedom report

Two barsScore 6.4

Free tierA free tier is on its own pricing page
Open codeNo open-source code on record
Runs widely1 of 6 device platforms
DocumentedPlans, terms and facts published

Cartesia Sonic is ranked #18 of 215 in text-to-speech software on Freedom251, made by Cartesia Sonic (San Francisco, California, United States). It runs on API, Web. There is a free plan. Paid plans start at $5/mo.

Cartesia Sonic plans and pricing

All plans

Free Free billed monthly 20K credits per month · $1 prepaid agents per month cartesia.ai · 20 Sept 2026

Pro $5/mo $5/mo 100K credits / month · $5 prepaid agents / month · Commercial use license · Instant voice cloning cartesia.ai · 1 Oct 2026

Startup $49/mo $49/mo 1.25M credits / month · $49 prepaid agents / month · Pro voice cloning · Organizations cartesia.ai · 1 Oct 2026

Scale $299/mo $299/mo 8M credits / month · $299 prepaid agents / month · Priority support · High concurrency limits cartesia.ai · 1 Oct 2026

Enterprise Not published Custom credits and agent usage cartesia.ai · 20 Sept 2026

Free Free $0/mo 20K credits / month · $1 prepaid agents / month · Text to Speech · Speech to Text cartesia.ai · 1 Oct 2026

Compared on text-to-speech software

Free plan: Yes
Paid from: $5/mo
Voice cloning: Yes
Commercial use: Yes
API access: Yes

Best Cartesia Sonic alternatives

See all 12

Two bars Voice.ai Free tier No. 1$5/mo6.7 Two bars Voicebox Free tier No. 2$1/mo6.7 Two bars Fish Audio Free tier No. 3$11/mo6.6 Two bars Speechify Free tier No. 4$29/mo6.6 Two bars TTSReader Free tier No. 5$10/mo6.6 Two bars Typecast Free tier No. 6$5/mo6.6

The record

Platforms: Web, API
Product: Sonic is a text-to-speech model for real-time voice applications.
Latency: Sonic has sub-90ms latency.
Languages: Sonic supports 44 languages.
Emotion: Sonic interprets emotional subtext and can insert non-verbal expressions such as laughter into transcripts.
Localization: Sonic can localize an audio clip into other languages while carrying over emotion, tone, and speaker identity.
Pronunciation: Custom pronunciation dictionaries let users specify pronunciations for proper nouns and domain terms.
Integrations: Managed Agents can use Cartesia-provisioned numbers, import Twilio numbers, or connect a carrier over SIP.
Voice agents: Managed Agents combine Ink-2 speech-to-text, a chosen LLM, and Sonic-3.6 text-to-speech with turn-taking and interruption handling.
Security: Cartesia lists HIPAA compliance, SOC 2 Type 2, GDPR, and PCI on the Sonic page.
Deployment: Cartesia says Sonic can be deployed on-premise, in a customer VPC on AWS, GCP, or Azure, or through OEM licensing.
Support: Cartesia's documentation directs users to Discord to chat with the Cartesia team and community for help.
Concurrency: The Free plan lists two concurrent Sonic text-to-speech requests, while Pro lists three.
Headquarters: San Francisco, California, United States
Price from: $5/mo

Where it ranks on Freedom251

Best Text-to-Speech Software in 2026#18 of 215
Best Game Voice Generators in 2026#5 of 41
Best AI Voice Generators in 2026#4 of 29

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Sources

cartesia.ai/pricing;· checked 20 Sept 2026
cartesia.ai/sonic· checked 1 Oct 2026
cartesia.ai/product/ai-phone-agent· checked 1 Oct 2026
cartesia.ai/learn/on-premise-voice-ai· checked 1 Oct 2026
docs.cartesia.ai/2025-04-16/get-started/overview· checked 1 Oct 2026
cartesia.ai/pricing· checked 1 Oct 2026
cartesia.ai· checked 28 Sept 2026