English voice for apps, offline

Short answer: 73 English offline voice packs across 39 industries, from $24 to $199 one time per voice, each with the open-source agent. Hear a free 25-sentence sample before you buy.

Every English bundle

Using English speech in your app

1. Offline pack (one payment): download the zip, bundle the audio with your app and play a sentence by looking it up in manifest.json. No network call, no per-play fee.
2. API for new text: English is supported for any sentence. Install an SDK (npm install speakvora or pip install speakvora) or call the endpoint directly:

   curl https://speakvora.com/api/v1/speak -H "Authorization: Bearer $SPEAKVORA_KEY" -H "Content-Type: application/json" -d '{"text":"...","voice":"af_heart","lang":"en"}'

Sample English sentences

• A group coordinator should be designated to manage the booking process.
• A ramp-equipped vehicle can be dispatched to your location.
• Absolutely, pet carriers are allowed in vehicles at this garage.
• Adapt your messaging tone based on whether you're addressing a problem or building relationships.
• All items are listed with accurate descriptions and photos of the actual product or a representative sample.
• Amazon provides pre-written templates that you can customize with your brand voice and details.
• A certificate expires soon.
• A faster route is available.
• A new update is available for your device.

Play the free 25-sentence sample of any bundle from its page.

The agent that comes with every pack

Every pack includes an open-source agent (MIT license, on GitHub) that runs on your own server and your own phone, Slack, calendar and email accounts. It only says the approved sentences, always honours STOP, starts in practice mode so nothing goes out until you switch it on, and needs the internet (and your own providers) for texts, calls and Slack. How the agent works.

Honest limits

• The voices are synthetic. Where the law or good practice requires it, tell listeners they are hearing an automated voice.
• Non-English audio is marked native review pending until a native speaker approves it.
• Packs are generic, ready-made lines in the library's voices. They are not your brand voice or a script written for you; for a new sentence call the API.
• The licence lets you play the audio inside your own apps, devices and services, commercially and offline. You may not resell or redistribute the files or use them to train speech models.

Honest limits

• The voices are synthetic. Where the law or good practice requires it, tell listeners they are hearing an automated voice.
• Non-English audio is marked native review pending until a native speaker approves it.
• Packs are generic, ready-made lines in the library's voices. They are not your brand voice or a script written for you; for a new sentence call the API.
• The licence lets you play the audio inside your own apps, devices and services, commercially and offline. You may not resell or redistribute the files or use them to train speech models.

Questions

Is there an English text to speech API for apps?

Yes, for new text: the API speaks English (lang "en") on any paid account, and the SDKs (npm and pip: speakvora) wrap the same endpoint. Packs cover the sentences you repeat.

Does English speech work offline?

Yes for the recorded sentences, with no per-play fee.

How much do the English bundles cost?

73 listings, from $24 to $199 one time per voice.