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Use cases · Text-to-Speech APIs

Best Voice Design APIs

Text-to-speech APIs that generate brand-new synthetic voices from a text prompt or tunable parameters, no audio sample required.

Required capability: Voice design.

Our pick: ElevenLabs Text to Speech

ElevenLabs Text to Speech is a REST API delivering high-quality, human-like AI voices for use cases spanning voice agents, audiobook production, video narration, game character voiceovers, and real-time conversational AI, with support for over a dozen synthesis capabilities including streaming, voice cloning, and multilingual output. Pricing starts at $6/month for 30,000 characters on the Starter plan, with a free tier of 10,000 characters per month and self-serve signup requiring no sales call. The API holds SOC 2 Type 2, ISO 27001, HIPAA, GDPR, and PCI DSS certifications, and offers Python and Node.js SDKs plus an MCP server. Notable customers include the Washington Post, HarperCollins, ESPN, and NVIDIA.

Best for: Prototypes and side projects - free to start, no sales call; Regulated or enterprise workloads - compliance attestations and an enterprise plan; AI agents and automation - an agent-ready surface (MCP / llms.txt).

ElevenLabs Text to Speech profile →

Best for…

Best overall
ElevenLabs Text to Speech - our default pick: strongest across pricing, trust and breadth
Best free pick
ElevenLabs Text to Speech - free tier: Free plan at $0/month includes 10,000 credits per month (1 text character = 1 credit for…
Best for enterprise
ElevenLabs Text to Speech - for regulated or large teams: SOC 2 Type II, HIPAA, enterprise plan
Cheapest to start
Azure AI Text to Speech - from $15 1M characters to start; compare on your real usage, not the entry price
Best for agents
ElevenLabs Text to Speech - easiest to wire up programmatically: MCP server + llms.txt
Broadest surface
Cartesia (Sonic) - 17 documented actions; breadth isn't quality, but it's the most to build on

Ranked (6)

  • #1 ElevenLabs Text to Speech

    81 / 100
    • Best overall
    • Best free pick
    • Best for enterprise
    • Best for agents

    ElevenLabs Text to Speech is a REST API delivering high-quality, human-like AI voices for use cases spanning voice agents, audiobook production, video narration, game character voiceovers, and real-time conversational AI, with support for over a dozen synthesis capabilities including streaming, voice cloning, and multilingual output. Pricing starts at $6/month for 30,000 characters on the Starter plan, with a free tier of 10,000 characters per month and self-serve signup requiring no sales call. The API holds SOC 2 Type 2, ISO 27001, HIPAA, GDPR, and PCI DSS certifications, and offers Python and Node.js SDKs plus an MCP server. Notable customers include the Washington Post, HarperCollins, ESPN, and NVIDIA.

    PricingHybrid · from $6 month (30,000 characters on Starter; ~$200/1M chars) · free tier ✓
    TrustSOC 2 Type II · HIPAA · GDPR · ISO 27001 · PCI DSS
    Does
    • Real-time streaming
    • Voice cloning
    • Voice design
    • SSML control
    • Multilingual voices
    • Word timestamps
    Used byWashington Post, HarperCollins, TIME, The New Yorker

    ElevenLabs Text to Speech profile →

  • #2 Azure AI Text to Speech

    79 / 100
    • Cheapest to start

    Azure AI Text to Speech is Microsoft's managed speech synthesis service, suited for voice agents, call center automation, audiobook narration, accessibility tools, and content creation. It offers over 30 deployment regions, a free tier of 500,000 characters per month, and usage-based pricing starting at $15 per million characters for standard voices. SDKs are available for Python, C#, JavaScript, Java, and Go, and the service carries SOC 2 Type 2, HIPAA, GDPR, ISO 27001, and PCI DSS certifications. Custom and personal voice cloning are supported, though professional voice fine-tuning requires limited-access approval.

    PricingUsage · from $15 1M characters · free tier ✓
    TrustSOC 2 Type II · HIPAA · GDPR · ISO 27001 · PCI DSS
    Does
    • Real-time streaming
    • Voice cloning
    • Voice design
    • SSML control
    • Multilingual voices
    • Word timestamps

    Azure AI Text to Speech profile →

  • #3 Cartesia (Sonic)

    68 / 100
    • Broadest surface

    Cartesia's Sonic API is a text-to-speech service built for low-latency voice applications such as conversational AI agents, customer support, dubbing, and audiobook narration, with a reported first-audio-byte latency of 90ms on Sonic 3.5. Pricing starts at $50 per million characters with a free tier of 20,000 characters per month, and self-serve signup is available without a sales call. The API supports REST and WebSocket streaming, instant voice cloning on all plans, and deploys across cloud regions, on-premises, and on-device. Cartesia holds SOC 2 Type II, HIPAA, GDPR, and PCI DSS certifications, and counts Quora, Cresta, and Rasa among its customers.

    PricingHybrid · from $50 1M characters · free tier ✓
    TrustSOC 2 Type II · HIPAA · GDPR · PCI DSS
    Does
    • Real-time streaming
    • Voice cloning
    • Voice design
    • Multilingual voices
    • Word timestamps
    Used byQuora, Cresta, Rasa

    Cartesia (Sonic) profile →

  • #4 OpenAI Text to Speech (gpt-4o-mini-tts / tts-1)

    68 / 100

    OpenAI Text to Speech converts text into lifelike spoken audio via three models, gpt-4o-mini-tts, tts-1, and tts-1-hd, targeting use cases such as voice agents, audiobooks, video narration, accessibility tools, and IVR. Pricing is usage-based at $15.00 per million characters with no sales call required to get started. The REST API ships with official SDKs for Python, Node.js, Java, Go, Ruby, and .NET, and the service is backed by SOC 2 Type II, ISO 27001, HIPAA, GDPR, and PCI DSS compliance alongside a published SLA.

    PricingUsage · from $15 1M characters · free tier ✗
    TrustSOC 2 Type II · HIPAA · GDPR · ISO 27001 · PCI DSS
    Does
    • Real-time streaming
    • Voice design
    Avoid ifYou want to try it free before paying

    OpenAI Text to Speech (gpt-4o-mini-tts / tts-1) profile →

  • #5 Hume AI Octave TTS

    69 / 100

    Hume AI Octave is a text-to-speech API focused on emotionally expressive, natural-sounding voice synthesis, targeting voice agents, audiobooks, podcasts, and conversational applications. Pricing starts at $50 per million characters with a free tier of 10,000 characters per month, self-serve signup, and an enterprise plan for higher volume. SDKs are available for Python, TypeScript, C#/.NET, and Swift, and the API supports WebSocket streaming with first-audio latency as low as 100ms on Octave 2. The service holds SOC 2 Type 2, HIPAA, and GDPR certifications.

    PricingHybrid · from $50 1M characters · free tier ✓
    TrustSOC 2 Type II · HIPAA · GDPR
    Does
    • Real-time streaming
    • Voice cloning
    • Voice design
    • Multilingual voices
    • Word timestamps
    Used byNiantic Spatial, GAF, Coconote

    Hume AI Octave TTS profile →

  • #6 Resemble AI

    62 / 100

    Resemble AI is a voice synthesis and deepfake security platform offering text-to-speech, voice cloning, real-time streaming, emotion control, and audio watermarking via a REST API, with SDKs for Node.js and Python. Pricing is usage-based at $0.0005 per second with self-serve signup, and an enterprise plan is available. The API is HIPAA and GDPR compliant, and customers include Netflix, Paramount, Deutsche Telekom, and the World Bank. WebSocket streaming requires a Business plan or above, and an MCP server is available for agent integrations.

    PricingUsage · from $0.0005 second · free tier ✗
    TrustSOC 2 In progress · HIPAA · GDPR
    Does
    • Real-time streaming
    • Voice cloning
    • Voice design
    • SSML control
    • Multilingual voices
    • Word timestamps
    Used byNetflix, Telnyx, Paramount, Deutsche Telekom
    Avoid ifYou want to try it free before paying

    Resemble AI profile →

Scope: only APIs with the required capability, picked from published, cited data. The score is one input, not the verdict, and we lead with each one’s trade-off. No reviews yet, no paid placement. See the full Text-to-Speech APIs directory.