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Cartesia

Real-time text-to-speech API for developers and voice agents.

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About

Cartesia (cartesia.ai) is the developer TTS platform built for real-time use: the Sonic model family delivers low-latency streaming speech for voice agents, with instant voice cloning (10 seconds of audio) and 44 languages.

Pricing (2026): free tier ~20k credits/mo; Pro from ~$4–5/mo with instant cloning. The developer favorite for conversational AI — ElevenLabs' sharpest rival on the API side.

What it can do

  • Real-time streaming TTS
  • Sonic model family
  • Instant voice cloning
  • 44 languages
  • Voice-agent ready

Setup

  1. Sign up at cartesia.ai and get an API key.
  2. POST /tts/bytes with text + voice id.
  3. Stream audio via WebSocket for real-time agents.
  4. Clone a voice with 10s of reference audio (Pro).

Prerequisites

API key; paid tier for cloning.

Use cases

audiomediaautomation

Works with

Generic APIAny agent (.md)

Trust score — 7/10

/10 trustMetrics-checked

Scored 7/10 (metrics tier). Strong developer traction in 2026 with real-time TTS and competitive pricing, but proprietary with provider-tier adoption estimates (thinner evidence). Metrics tier.

How the trust score is built

Full methodology →
Adoption · stars/downloads, log-scaled vs peers
7.0/10
Maintenance · recency, releases, issue load
7.0/10
Openness · license + docs
4.8/10
Manual review · sanity read + red-flag check
8.0/10
  • · provider-tier estimate — thinner evidence (no public adoption metric)
  • · developer TTS; no public repo — adoption estimated
  • · released 285 days ago
  • · manual review: real-time TTS/voice-agent API (Sonic); Pro from ~$4-5/mo; strong developer traction in 2026; license: proprietary

Sources

Every fact above was checked against these sources. Where a claim comes from the provider and couldn't be independently verified, the text says so.