SpeechifyAI is a developer API for expressive text-to-speech and voice cloning. It provides streaming Simba models, catalog and cloned voices, SSML support, and a free starting tier for building speech into applications.
SpeechifyAI is a developer-focused API for expressive text-to-speech and voice cloning. It lets applications generate audio from text through HTTP endpoints, using catalog voices or, on paid plans, cloned voices created from a consented reference recording.
The platform is built around streaming Simba models for applications that need speech while content is being generated. It includes standard and streaming speech endpoints, SSML and speech marks, multiple audio formats, and a browser listening lab for comparing prepared voices and trying text before integration. SpeechifyAI is separate from the Speechify Reader app and its subscription.
Developers can begin with an API key and a free monthly allowance without adding a credit card. Usage is calculated from the characters spoken. Paid plans add voice cloning and allow continued usage through purchased top-up balance, while plan-specific options include batch synthesis, additional seats, and different support levels.
Generate speech through standard or streaming API endpoints using Simba models. The site reports a median first-audio-byte time of 56 ms and a p90 of 102 ms for its Simba 3.2 production US East path; these are first-byte measurements, not guarantees of audible end-to-end latency.
Use SpeechifyAI catalog voices or reusable cloned voices on paid plans. Voice cloning starts with a reference recording, and the product instructs users to clone only voices they have permission to use.
Control synthesis with SSML and request speech marks in addition to ordinary text input. SSML tags are not counted as spoken characters for usage calculation.
The text-to-speech API returns generated speech and supports five audio formats, including MP3. A documented request uses text, a Simba model, a voice ID, and an audio format.
Simba 3.2 is listed for English, while Simba 3.0 is shown with seven locales across English, German, Spanish, French, Italian, and Portuguese. Prepared samples also demonstrate delivery choices such as neutral, calm, cheerful, energetic, and sad; available controls vary by model and voice.
Add generated narration to reading, publishing, or content applications by sending changing text to the API and receiving audio in a supported format.
Turn support messages or prepared response text into spoken output for interfaces that need an audible customer-service experience. The site uses customer support as one of its example contexts.
Use streaming synthesis when an application needs to begin receiving audio before the full response is complete, such as an interactive interface with dynamically generated text.
Create a reusable voice from a permitted reference recording for products that need a consistent speaker identity across generated scripts. The source recording must be consented, and voice cloning is available on paid plans.
Create an API key and call the text-to-speech endpoint with an authorization header, text input, a model, a voice ID, and an audio format. SpeechifyAI provides a free tier with 500,000 characters per month and no credit card requirement.
No. SpeechifyAI is the developer API and is billed separately from the Speechify Reader app. Reader subscriptions do not include API usage.
Usage is billed by the characters of text that are spoken. SSML tags and whitespace at the very beginning or end of the input are excluded; spaces between words are counted.
Self-serve listings show Simba 3.2 for English and Simba 3.0 for six languages with seven locales: English, German, Spanish, French, Italian, and Portuguese. Voice and model compatibility varies, and broader language coverage is available through sales.
Voice cloning uses a reference recording to create a reusable voice. You must have permission to use the voice being cloned. The source states that voice cloning is available on paid plans but does not provide a complete set of recording specifications in the supplied material.
Traffic data is for reference only.
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