Cartesia vs ElevenLabs: pricing, features and which to choose

Cartesia is a San Francisco startup founded in 2023 by Karan Goel, Albert Gu, Arjun Desai, Brandon Yang and Chris Ré, researchers from Stanford's AI lab. Gu co-created the S4 and Mamba state space model architectures, which process long sequences with less memory than transformers, and that research is the basis of the company's products. Cartesia launched its Sonic text-to-speech model in 2024 and raised a $64 million Series A led by Kleiner Perkins in March 2025, bringing total funding to $91 million, according to Fortune. Its homepage names ServiceNow, Retell, Blue Machines and Quora among customers. The company's pitch is speed: models that start speaking quickly enough for live phone conversation, sold through one API that covers speech generation, transcription and complete voice agents.

Developers reach Cartesia through a REST and WebSocket API or the browser playground. Sonic turns text into streaming audio, with controls for speed, emotion and pronunciation, and supports more than 40 languages. Instant voice cloning creates a voice from a few seconds of audio on paid plans, and professional cloning trains a closer copy from longer recordings on the Startup plan and above. A localisation feature gives a cloned voice a new accent. Ink transcribes live audio for agents that need to hear callers. Managed Agents, the newest product, hosts complete phone agents with telephony, so a team can define an agent's prompt and tools without wiring a separate orchestration layer. Cartesia also offers on-premises and on-device deployment for customers with data residency rules.

Cartesia's voice library and creator tools are thinner than ElevenLabs, which also offers dubbing, sound effects and music, so it is a weaker fit for video producers and audiobook narrators. Managed Agents are newer than Vapi or Retell and have fewer integrations. Credit-based billing means long-form narration gets expensive faster on the low tiers. ElevenLabs Flash competes directly on latency with a larger voice catalog. Deepgram's Aura voices are cheaper per minute but less expressive, and Hume, once a rival on expressive speech, is closing its TTS API in November 2026. Pick Cartesia when you are building a real-time voice agent or interactive app and the delay before the first syllable is the metric you care about, or when you need on-device or on-premises speech models.

ElevenLabs is a voice technology company founded in 2022 by Mati Staniszewski and Piotr Dabkowski, initially focused on human-like text to speech. It now spans ElevenCreative for generating, editing, dubbing, and localizing audio; ElevenAPI for production voice infrastructure; and ElevenAgents for deployable voice and chat agents. The platform also includes speech recognition, voice cloning, voice design, sound effects, music, image and video tools, Studio productions, knowledge bases, and workflow building. Its latest models include expressive Eleven v4, low-latency v4 Turbo, multilingual v3, Flash v2.5, and Scribe v2 transcription. Strengths include unusually broad language coverage, expressive delivery, and fast realtime performance. However, pricing, concurrency, commercial rights, training controls, and third-party dependencies require scrutiny. Cartesia, Inworld, and Google Gemini TTS are credible alternatives. ElevenLabs best suits creators, developers, and businesses needing integrated voice production.

A typical ElevenLabs workflow starts with a script, a library voice, or a Voice Design prompt, then moves through generation, editing, localization, and export. Its creative tools combine text to speech, speech to text, voice cloning, voice changing, voice isolation, sound effects, music, image and video generation, dubbing, and Studio Productions. Developers can integrate HTTP endpoints, WebSocket streaming, or Text-to-Dialogue, while ElevenAgents adds realtime configurations, workflow building, knowledge bases, widgets, multilingual conversations, and text messaging. Scribe v2 can return word-level timestamps, speaker diarization, and dynamic audio tagging. Users may create an Instant Voice Clone, or access Professional Voice Cloning on eligible plans. This breadth suits creators producing complete media projects as well as teams embedding generated audio and conversational agents into applications.

ElevenLabs is a broad, hosted alternative to narrower voiceover tools, combining expressive speech, dubbing, music, sound effects, voice design, image and video features, Studio productions, and realtime agents. Its latest Eleven v4 and v4 Turbo models target emotional, contextual, multilingual speech, with Turbo reaching approximately 150ms time to first speech, while Scribe v2 handles transcription, timestamps, and speaker diarization. Credit consumption can complicate forecasting: paid plans start at $6 monthly, with annual billing offering two months free, but separate activities draw from shared quotas. Free output is noncommercial, and users need rights to inputs, voices, and models. Cartesia is better for developers focused on low-latency speech infrastructure; Murf AI suits collaborative voiceover production, while WellSaid emphasizes licensed voices and enterprise controls. Choose ElevenLabs for varied localization and agent workflows in one account.