# Cartesia — AI Compare Ninja

> Real-time text-to-speech, speech-to-text and managed voice agents through a usage-based API.

## Overview
- **Category:** Audio & Voice (Voice & speech)
- **Status:** Active · checked - Active speech-AI API with Free through Enterprise offers.
- **Paid from:** 5 USD / month (Pro)
- **Free access:** Free plan (20000 credits per month, plus 1 USD of agent credit, which covers about 27 minutes with Sonic or about 1 hour 51 minutes with Ink. Concurrency limits are 2 for text-to-speech (TTS) and 8 each for speech-to-text (STT) and agents.)
- **Website:** https://cartesia.ai/
- **Canonical URL:** https://www.aicompare.ninja/en/tool/cartesia

## What it does
- TTS, STT and managed voice agents with separate consumption types
- Zero Data Retention only for Enterprise TTS/STT

## In brief
Cartesia combines speech synthesis, transcription and voice agents. Monthly plans include credits and agent credit, but telephony and call minutes are billed separately. Documented minutes are model estimates, not a blanket output promise. Inputs and outputs may serve model training by terms; a future opt-out and Enterprise ZDR are narrower.


## Limits
Free/Pro/Startup/Scale include 20,000/100,000/1.25M/8M credits and 1/5/49/299 USD agent credit monthly. Sonic-3.6 includes about 27/133/1,667/10,667 minutes, Ink-2 about 1h51/9h16/115h44/740h44. TTS concurrency is 2/3/5/15, STT 8/12/20/60, agent calls 8/12/20/60. Instant/professional voice cloning and organizations depend on plan. Terms allow inputs, outputs and interactions for model training unless otherwise agreed; opt-out covers selected categories only prospectively. Zero Data Retention is Enterprise TTS/STT only. Outputs can be similar; commercial use depends on tier.

## Pricing tiers
| Tier | Price | Period | What you get |
| --- | --- | --- | --- |
| Free | free | free | 20000 credits/month, 1 USD agent credit; Sonic ~27 min, Ink ~1h51; TTS 2, STT/agents 8/8 concurrent |
| Pro | 5 USD | month | 100000 credits/month, 5 USD agent credit; Sonic ~133 min, Ink ~9h16; TTS 3, STT/agents 12/12 concurrent |
| Startup | 49 USD | month | 1.25M credits/month, 49 USD agent credit; Sonic ~1667 min, Ink ~115h44; TTS 5, STT/agents 20/20 concurrent |
| Scale | 299 USD | month | 8M credits/month, 299 USD agent credit; Sonic ~10667 min, Ink ~740h44; TTS 15, STT/agents 60/60 concurrent |
| Enterprise | contact sales | custom | Custom credits, agent usage and concurrency; DPA/BAA, SSO, ZDR for TTS/STT by agreement |

## Sources
All details regarding plans, limits, and features are based on official vendor documentation and the primary sources verified below.

- https://www.cartesia.ai/pricing
- https://www.cartesia.ai/legal/terms
- https://www.cartesia.ai/legal/privacy
- https://docs.cartesia.ai/enterprise/zero-data-retention

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*Source: AI Compare Ninja (2026) - https://www.aicompare.ninja/en/tool/cartesia*