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Cartesia

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

Free accessFree plan20000 credits/month, 1 USD agent credit; Sonic ~27 min, Ink ~1h51; TTS 2, STT/agents 8/8 concurrent
Paid fromPro100000 credits/month, 5 USD agent credit; Sonic ~133 min, Ink ~9h16; TTS 3, STT/agents 12/12 concurrent

Category: Audio & Voice · Voice & speech

Features

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.

Prices and plans

TierPricePeriodWhat you get
Freefreefree20000 credits/month, 1 USD agent credit; Sonic ~27 min, Ink ~1h51; TTS 2, STT/agents 8/8 concurrent
Pro5 USDmonth100000 credits/month, 5 USD agent credit; Sonic ~133 min, Ink ~9h16; TTS 3, STT/agents 12/12 concurrent
Startup49 USDmonth1.25M credits/month, 49 USD agent credit; Sonic ~1667 min, Ink ~115h44; TTS 5, STT/agents 20/20 concurrent
Scale299 USDmonth8M credits/month, 299 USD agent credit; Sonic ~10667 min, Ink ~740h44; TTS 15, STT/agents 60/60 concurrent
Enterprisecontact salescustomCustom credits, agent usage and concurrency; DPA/BAA, SSO, ZDR for TTS/STT by agreement

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.

Similar tools

From the same subcategory “Voice & speech”, continuing alphabetically from this entry.

DeepgramDeveloper API platform for speech-to-text, text-to-speech, and voice agents, billed on a usage basis.Pay As You GoElevenLabsGenerate speech, voiceovers, dubbing, and voice agents with synthetic voices.StarterFish AudioAI text-to-speech and voice-cloning platform (plus speech-to-text and voice changer) positioned as a cheaper alternative to ElevenLabs.PlusKits.aiConvert and clone singing voices.StarterMurf AICreate voiceovers with many voices, languages, and a studio editor.Creator (annual billing)ParaSpeechMac-native dictation app that turns speech into text directly in any field via a keyboard shortcut, with optional on-device processing.MonthlyPicovoiceOn-device AI SDKs for wake word detection, speech-to-text, text-to-speech, speaker recognition and more that run entirely on-device instead of in the cloud; free trial available, paid use only on request.Enterprise / productionSarvamIndian AI API platform for text-to-speech, speech-to-text, translation, document AI, and multilingual chat models focused on Indian languages.Sarvam

More tools for the same task, alphabetical and sourced. Not a quality ranking.

Voice and voiceover

FAQ

Is Cartesia available for free?

Yes. A permanently free plan is published, not a time-limited trial. 20000 credits/month, 1 USD agent credit; Sonic ~27 min, Ink ~1h51; TTS 2, STT/agents 8/8 concurrent

Where is Cartesia's vendor based?

Cartesia AI, Inc., based in USA. For data processing and privacy terms the vendor's own contract governs.

How is Cartesia billed?

All plans list unlimited workspace seats but different model credits, agent credit and concurrency. Agent calls cost 0.06 USD/minute from Free through Scale; Cartesia telephony adds 0.014 USD/minute. The advertised free LLM use for UI-created agents and evaluations is expressly limited in time. Enterprise is custom.

Is Cartesia still active?

Active speech-AI API with Free through Enterprise offers.

How many plans are documented for Cartesia?

The catalog documents 5 plans with price, billing period, and included features.

Which use case is Cartesia categorized for?

Cartesia is listed in the catalog under “Audio & Voice.”

Where do the details about Cartesia come from?

Prices, limits, and product details are documented against the listed official vendor page.

How we compare

We compare free access, paid entry, plan limits, features and the listed official sources. Unsourced figures stay marked as not published.

Only confirmed entries appear in the catalog. Prices, plans and limits come from listed official vendor pages. Missing figures stay marked as not published. Result lists are alphabetical by default and can be switched to Free access first; neither is a quality ranking. The vendor page always wins.

Edited and checked by the AI Compare team

Sources

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