SpeechifyAI API
Best for: Developers & real-time voice agents
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Speechify's developer-focused TTS and voice cloning API for streaming audio, real-time voice agents, and applications.
Key features
- ✓Streaming text-to-speech API
- ✓Simba 3.2 for English
- ✓Simba 3.0 for multilingual speech
- ✓Real-time voice generation
- ✓Instant voice cloning
- ✓10 to 30 second cloning sample
- ✓Verified consent for voice cloning
- ✓500K characters on the free tier
- ✓Up to 20,000 characters per request
- ✓56 ms p50 time to first byte
- ✓102 ms p90 time to first byte
- ✓SSML
- ✓Expressive speech controls
Overview
SpeechifyAI is a developer-focused text-to-speech and voice cloning API powered by Speechify's Simba speech models. It provides low-latency speech generation, streaming audio, expressive controls, and voice cloning for applications that need natural-sounding AI voices.
Developers can use SpeechifyAI to add voice capabilities to AI assistants, voice agents, accessibility products, customer-support systems, educational applications, and other software. Its streaming API is designed for real-time experiences where audio needs to start playing quickly instead of waiting for an entire response to finish.
SpeechifyAI currently offers Simba 3.2 for English speech and Simba 3.0 for multilingual applications. Voice cloning is available from a 10 to 30 second audio sample, with verified consent requirements.
How SpeechifyAI API works
Beyond the sections above, integration is straightforward: you send text to the streaming endpoint and play chunks as they arrive, which keeps response times low for conversational products.
SSML and expressive controls let you tune pauses, emphasis and tone, and the per-request character cap should be considered when chunking long text.
Voice cloning
SpeechifyAI allows developers to create a custom voice from a short audio sample. The cloning process can use a 10 to 30 second recording, making it suitable for applications that need a personalized or branded voice.
SpeechifyAI also requires verified consent for voice cloning. Developers should ensure they have the necessary permission and rights before cloning or deploying another person's voice.
Real-time text-to-speech
The streaming API makes SpeechifyAI suitable for applications where speech needs to be generated and played with minimal delay. This includes AI voice agents, conversational assistants, customer-support applications, accessibility tools, and interactive software.
SpeechifyAI reports 56 ms p50 and 102 ms p90 time to first byte based on production measurements from September 15, 2026, in US East. Actual latency can vary depending on network conditions, infrastructure, and user location.
SpeechifyAI vs Speechify
SpeechifyAI is the developer/API offering, while Speechify's consumer products focus on reading and creator workflows.
Speechify Reader is designed for listening to documents, PDFs, web pages, and other written content. Speechify Studio focuses more on creator features such as voiceovers and dubbing. SpeechifyAI is intended for developers who want to integrate speech generation directly into their own applications.
Getting started with SpeechifyAI API
- Create an account and use the free tier with an API key.
- Send a streaming request and play the audio as it arrives.
- Test cloning with a 10 to 30 second sample, completing the consent verification.
- Measure latency from your own region before launch.
Who should use SpeechifyAI API
SpeechifyAI is designed primarily for developers and product teams building:
- AI voice agents
- Conversational AI applications
- AI assistants
- Accessibility products
- Customer-support systems
- Educational applications
- Voice-enabled SaaS products
- Automated narration
- Real-time voice interfaces
- Multilingual applications
Try SpeechifyAI API
Ready to try it? Visit the SpeechifyAI API official website to preview the available voices, check current plan limits and pricing, and test it on a sample of your own script.
Pros & cons
- +Streaming TTS for real-time applications
- +500K characters on the free tier
- +Voice cloning from a 10 to 30 second sample
- +Built on Speechify's Simba models
- +Low-latency audio generation
- +Designed for real-time voice applications
- −Advanced usage can become expensive at scale
- −Multilingual model availability varies by model
- −Voice cloning requires verified consent
Pricing
Free
- ✓500K characters
- ✓Catalog voices
- ✓Streaming
- ✓SSML
Starter
- ✓1.9M characters
- ✓Voice cloning
- ✓Streaming
- ✓SSML
- ✓Up to 3 seats
- ✓Service accounts for CI
- ✓Top-ups available
Pro
- ✓13.5M characters
- ✓Voice cloning
- ✓Streaming
- ✓SSML
- ✓Priority support
Scale
- ✓78M characters
- ✓Lowest published rate
- ✓Batch synthesis
- ✓Up to 25 seats
- ✓100 service accounts
- ✓Dedicated support and SLA
- ✓$6 per 1M characters
Specifications
| Models | Simba 3.2 (English), Simba 3.0 |
|---|---|
| Languages | 6 languages across 7 locales on Simba 3.0 |
| Additional languages | 48 more available on request |
| Voice cloning | Yes, instant |
| Cloning sample | 10 to 30 seconds |
| Consent verification | Required |
| Streaming | Yes |
| Max characters/request | 20,000 |
| Latency | 56 ms p50 / 102 ms p90 time to first byte |
| TTS API | Yes |
| Real-time API | Yes |
| SSML | Yes |
| Expressive controls | Yes |
| Free tier | 500K characters |
| Primary use cases | Voice agents, applications & real-time voice |
| Latency measurement | 56 ms p50 / 102 ms p90, measured Sep 15, 2026 in production, US East |