# Cartesia Review

> Cartesia review: Lowest-latency TTS for real-time voice agents. Verified pricing, features, and the strongest alternatives in Text-to-speech APIs.

![Cartesia logo](https://www.versusref.com/logos/cartesia.png)

Lowest-latency TTS for real-time voice agents

Among the 46 text-to-speech tools we track, Cartesia has the 9th-widest language coverage and the 3rd-fastest time-to-first-byte - a fit for multilingual and localization projects and real-time, conversational apps.

From $5/mo · facts verified Jul 20, 2026

## What we know about Cartesia

This is our verified profile of Cartesia, a text-to-speech apis platform - lowest-latency TTS for real-time voice agents. Every fact about Cartesia below carries the source it came from and the day we checked it.

On pricing, Cartesia starts at $5 per month for its entry tier. That is the sticker rate: real production cost usually runs higher once you add a language model, a voice provider, and telephony minutes.

On capabilities, Cartesia covers streaming audio output, realtime websocket api, instant voice cloning, professional voice cloning, word-level timestamps, and pronunciation dictionaries, and does not offer commercial use on free tier. Each of those is verified against Cartesia's own docs or dashboard, not marketing copy.

For compliance, with Cartesia: SOC 2 Type II is in place. If you are in a regulated space, confirm the current posture with Cartesia before you commit, since these change plan by plan.

Placed against the 46 text-to-speech tools we track, Cartesia's strongest showing is the 9th-widest language coverage, while it trails at 3rd on latency - a spread worth weighing against your own priorities.

In total we track 21 verified facts for Cartesia today, each linking the primary source it came from so you can check our work - and vendor claims we have not measured ourselves are labeled as such on the Cartesia fact sheet below.

## Cartesia pricing

Cheapest paid plan $5/mo with 100,000 characters included, verified Jul 20, 2026 ([source](https://cartesia.ai/pricing)).

| Monthly volume | $ / 1M chars | $ / audio-min | Monthly bill |
| --- | --- | --- | --- |
| 200K chars/mo | Higher plan | Higher plan | Higher plan |
| 2M chars/mo | Higher plan | Higher plan | Higher plan |
| 20M chars/mo | Higher plan | Higher plan | Higher plan |

Effective rates from published pricing; subscription plans resolve to plan fee plus overage. ~950 characters ≈ 1 audio minute.

## Fact sheet

### Pricing

| Fact | Value | Verified | Source |
| --- | --- | --- | --- |
| Pricing model | credits | Jul 20 | [source](https://cartesia.ai/pricing) |
| Cheapest paid plan | $5 | Jul 20 | [source](https://cartesia.ai/pricing) |
| Characters included on cheapest plan | 100,000 chars/mo | Jul 20 | [source](https://cartesia.ai/pricing) |
| Free tier quota | 20,000 credits/month (~27 TTS minutes) | Jul 20 | [source](https://cartesia.ai/pricing) |

### Capabilities

| Fact | Value | Verified | Source |
| --- | --- | --- | --- |
| TTFB latency (vendor-claimed) | ~90 ms | Jul 20 | [source](https://docs.cartesia.ai/build-with-cartesia/tts-models/latest) |
| Streaming audio output | ✓  Yes | Jul 20 | [source](https://docs.cartesia.ai/api-reference/tts/sse) |
| Realtime websocket API | ✓  Yes | Jul 20 | [source](https://docs.cartesia.ai/api-reference/tts/websocket) |
| Instant voice cloning | ✓  Yes | Jul 20 | [source](https://docs.cartesia.ai/build-with-cartesia/capability-guides/clone-voices) |
| Professional voice cloning | ✓  Yes | Jul 20 | [source](https://docs.cartesia.ai/build-with-cartesia/capability-guides/clone-voices-pro) |
| Minimum audio for voice cloning | IVC: clip up to 10 seconds | Jul 20 | [source](https://docs.cartesia.ai/build-with-cartesia/capability-guides/clone-voices-pro) |
| Languages supported | 42 languages | Jul 20 | [source](https://docs.cartesia.ai/build-with-cartesia/tts-models/latest) |
| Word-level timestamps | ✓  Yes | Jul 20 | [source](https://docs.cartesia.ai/examples/tts-sse-with-timestamps) |
| Pronunciation dictionaries | ✓  Yes | Jul 20 | [source](https://docs.cartesia.ai/api-reference/pronunciation-dicts/create) |

### Compliance & trust

| Fact | Value | Verified | Source |
| --- | --- | --- | --- |
| Commercial use on free tier | ✗  No | Jul 20 | [source](https://cartesia.ai/pricing) |
| SOC 2 Type II | ✓  Yes | Jul 20 | [source](https://docs.cartesia.ai/self-hosted/introduction) |
| HIPAA BAA available | ◑  Enterprise only | Jul 20 | [source](https://docs.cartesia.ai/self-hosted/introduction) |
| Self-host / on-prem option | ✓  Yes | Jul 20 | [source](https://docs.cartesia.ai/self-hosted/introduction) |
| Model weights license | closed | Jul 20 | [source](https://docs.cartesia.ai/self-hosted/introduction) |

### Build experience

| Fact | Value | Verified | Source |
| --- | --- | --- | --- |
| Official SDKs | Python, JavaScript/TypeScript | Jul 20 | [source](https://docs.cartesia.ai) |
| Concurrency on base plan | Free: 2 | Jul 20 | [source](https://docs.cartesia.ai/use-the-api/concurrency-limits-and-timeouts) |
| Output formats | raw PCM (pcm_f32le | Jul 20 | [source](https://docs.cartesia.ai/build-with-cartesia/capability-guides/tts-output-audio-format) |

## Cartesia head-to-head

| Comparison | Record | Per use case |
| --- | --- | --- |
| [Cartesia vs ElevenLabs](https://www.versusref.com/tts/cartesia-vs-elevenlabs/) | won 3 · lost 3 · tied 0 | Audiobooks: lost; Content Creators: lost; Developers: lost; Dubbing: won; Self-Hosted: won; Voice Agents: won |
| [Cartesia vs OpenAI TTS](https://www.versusref.com/tts/cartesia-vs-openai-tts/) | won 4 · lost 1 · tied 0 | Audiobooks: lost; Content Creators: won; Dubbing: won; Self-Hosted: won; Voice Agents: won |
| [Cartesia vs Rime](https://www.versusref.com/tts/cartesia-vs-rime/) | won 2 · lost 2 · tied 1 | Audiobooks: lost; Developers: won; Dubbing: lost; Self-Hosted: tie; Voice Agents: won |
| [Cartesia vs Deepgram Aura-2](https://www.versusref.com/tts/cartesia-vs-deepgram-aura/) | won 3 · lost 0 · tied 1 | Content Creators: won; Dubbing: won; Self-Hosted: tie; Voice Agents: won |
| [Cartesia vs Voxtral TTS](https://www.versusref.com/tts/cartesia-vs-voxtral-tts/) | won 5 · lost 1 · tied 0 | Audiobooks: won; Content Creators: won; Developers: won; Dubbing: won; Self-Hosted: lost; Voice Agents: won |
| [Cartesia vs Inworld TTS](https://www.versusref.com/tts/cartesia-vs-inworld-tts/) | won 3 · lost 3 · tied 0 | Audiobooks: lost; Content Creators: lost; Developers: won; Dubbing: lost; Self-Hosted: won; Voice Agents: won |
| [Cartesia vs LMNT](https://www.versusref.com/tts/cartesia-vs-lmnt/) | won 5 · lost 1 · tied 0 | Audiobooks: lost; Content Creators: won; Developers: won; Dubbing: won; Self-Hosted: won; Voice Agents: won |

Source: https://www.versusref.com/tts/tools/cartesia/