AtlasVoice 2.4 beta is here: natural voices, now free. Try the beta → (opens in a new tab)

AtlasVoice (opens in a new tab)
New The AtlasVoice API is here

Natural text to speech for any website or app.

The voices behind AtlasVoice for WordPress, now as a simple REST API. Send text, get back an MP3. It works for Shopify, Wix, Webflow, Squarespace or anything you build yourself.

100,000 free characters a month 81 languages and accents, free 380 AtlasVoice Cloud voices with Premium

Your first MP3 in one request
curl -X POST "https://api.atlasvoice.cloud/v1/synthesize?raw=1" \
  -H "Authorization: Bearer $ATLASVOICE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"text": "Hello from AtlasVoice.", "lang": "en-US"}' \
  -o hello.mp3

Why the AtlasVoice API

Built for real sites, not demos

It's the same service that powers AtlasVoice for WordPress. Now your platform can use it too.

Works anywhere

A plain REST API: call it from any server language, on any platform.

Stream while it's made

Add stream=1 and the MP3 starts arriving with the first sentences, so a player can begin at once.

Private by design

Your text is never stored, and the generated MP3 is deleted from our servers within minutes.

Fair billing

You pay per character of text, and failed requests are never counted.

A dashboard included

See your usage, keys and any failed requests at app.atlasvoice.cloud, or ask the API with GET /v1/usage.

Clear errors

Every error has a stable code and a plain-English message, like quota_exceeded, with Retry-After when you should wait.

Quick start

From sign-up to audio in three steps

Create a free account

Sign up at app.atlasvoice.cloud and add a project for your site or app. Copy the API key; it's shown only once.

Send your text from your server

Call POST /v1/synthesize with your key. Keep the key on your server, never in browser code.

Save the MP3

Add ?raw=1 to get the file itself, and store it with your content. Without it you get a link that works for 10 minutes.

import { writeFile } from 'node:fs/promises';

const res = await fetch('https://api.atlasvoice.cloud/v1/synthesize?raw=1', {
  method: 'POST',
  headers: {
    Authorization: `Bearer ${process.env.ATLASVOICE_API_KEY}`,
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({ text: 'Hello from AtlasVoice.', lang: 'en-US' }),
});

if (!res.ok) throw new Error((await res.json()).error.message);
await writeFile('hello.mp3', Buffer.from(await res.arrayBuffer()));

Reference

The essentials

Send your key as Authorization: Bearer av_live_…. Every error comes back as {"error": {"code", "message"}}.

RequestWhat it does
POST /v1/synthesizeTurns text in a lang (such as en-US) into speech. Returns JSON with a 10-minute MP3 link and your usage, or the MP3 itself with ?raw=1. Up to 5,000 characters per request; send longer text in parts.
GET /v1/usageYour plan, characters used this month, what's left, and when it resets.
GET /v1/voicesEvery language and voice you can use. No key needed.
?raw=1&stream=1Streams the MP3 while it's being made, for players that start before the file is complete. An unfinished stream is never billed.

Plans

Free to start. Premium with your Pro licence.

One AtlasVoice Pro licence covers both the WordPress plugin and the API, so there's nothing extra to buy for your other sites.

Free

$0

No card needed

  • 100,000 characters a month
  • 81 languages and accents with the AtlasVoice TTS voice
  • 30 requests a minute
  • Streaming, usage dashboard and failed-request logs
Get a free API key (opens in a new tab)

Premium

From $59 a year

With an AtlasVoice Pro licence · 14-day money-back guarantee (conditions apply (opens in a new tab))

  • No monthly character limit
  • 380 AtlasVoice Cloud voices in 47 languages, from voice.atlasvoice.cloud with the same key
  • 120 requests a minute
  • Paste your licence key into the project's Premium licence box in the dashboard; each site uses one seat
Get a Pro licence (opens in a new tab)

Need a plan just for the API, or more requests per minute? Tell us what you need (opens in a new tab).

Good to know

Before you build

Start today

Your first 100,000 characters are on us

Create a free account, add your site or app, and turn your first article into audio in minutes.

Get a free API key (opens in a new tab)