TTS API vs OpenAI TTS

Side-by-side comparison of the TTS API vs OpenAI TTS. PixelAPI's text-to-speech API converts text to natural-sounding audio in 33 languages, with voice design (describe a voice in plain text) and voice cloning (upload a reference recording). At $0.0018 flat per request — no per-character metering — it costs a fraction of OpenAI tts-1's $0.015 per 1,000 characters. 5,000 free credits (7-day trial), no credit card.

Quick start — one API call

Sign up, copy your key from the dashboard, and POST your text. The endpoint returns a generation id; poll until status=completed, then download the MP3 from output_url.

# Generate speech (voice design — no reference file needed)
curl -X POST https://api.pixelapi.dev/v1/tts/generate \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -F "text=Hello, welcome to our platform." \
  -F "language=en" \
  -F "voice_description=young woman, warm and friendly"
# {"id": "uuid", "status": "queued", "credits_used": 1.8, ...}

# Poll until completed
curl https://api.pixelapi.dev/v1/tts/status/UUID \
  -H "Authorization: Bearer YOUR_API_KEY"
# {"status": "completed", "output_url": "https://cdn.pixelapi.dev/..."}

pip install pixelapi
# ---
from pixelapi import PixelAPI

client = PixelAPI(api_key="YOUR_API_KEY")
result = client.tts(
    text="Hello, welcome to our platform.",
    language="en",
    voice_description="young woman, warm and friendly"
)
result.save("output.mp3")  # MP3 audio

npm install pixelapi
// ---
import { PixelAPI } from "pixelapi";

const client = new PixelAPI({ apiKey: process.env.PIXELAPI_KEY });
const result = await client.tts({
  text: "Hello, welcome to our platform.",
  language: "en",
  voiceDescription: "young woman, warm and friendly",
});
await result.save("output.mp3"); // MP3 audio

composer require pixelapi/pixelapi
// ---
<?php
use PixelAPI\Client;

$client = new Client(getenv("PIXELAPI_KEY"));
$result = $client->tts([
    "text"             => "Hello, welcome to our platform.",
    "language"         => "en",
    "voice_description"=> "young woman, warm and friendly",
]);
file_put_contents("output.mp3", $result->getBody());

gem install pixelapi
# ---
require "pixelapi"

client = PixelAPI::Client.new(api_key: ENV["PIXELAPI_KEY"])
result = client.tts(
  text: "Hello, welcome to our platform.",
  language: "en",
  voice_description: "young woman, warm and friendly"
)
File.binwrite("output.mp3", result.body)

go get github.com/pixelapi/pixelapi-go
// ---
import "github.com/pixelapi/pixelapi-go"

client := pixelapi.New("YOUR_API_KEY")
result, err := client.TTS(pixelapi.TTSRequest{
    Text:             "Hello, welcome to our platform.",
    Language:         "en",
    VoiceDescription: "young woman, warm and friendly",
})
if err != nil { panic(err) }
result.Save("output.mp3")

TTS API vs OpenAI TTS: Pricing comparison

OpenAI TTS charges per character; PixelAPI charges a flat rate per request — regardless of whether your text is 50 characters or 500. The difference compounds fast at scale.

Pricing verified from each rival's public pricing page September 2026. Note: PlayHT was acquired by Meta in July 2025; check play.ht for current availability. PixelAPI's flat-rate pricing means a 100-character text costs the same as a 500-character text — no surprise bills on short utterances.

What you get back

Common workflows

The TTS API powers these production workflows. Each links to a setup guide:

Integrations & SDKs

TTS API vs OpenAI TTS — and other alternatives

Rate limits & error handling

The TTS endpoint shares the same per-plan rate limits as the rest of the PixelAPI platform: 20 requests/minute on the free trial, 60 on Starter, 120 on Pro, and 300 on Scale — with 3/10/20/50 parallel jobs respectively. Exceeding the limit returns HTTP 429 with a Retry-After header.

# Python SDK handles 429 automatically with exponential backoff
from pixelapi import PixelAPI
client = PixelAPI(api_key="...", max_retries=4)
result = client.tts(text="Hello world", language="en")  # auto-retries on 429

TTS jobs are asynchronous. Common status values:

• queued — job accepted, waiting for a worker
• processing — audio is being generated
• completed — output_url is ready to download
• failed — credits are automatically refunded; check error field

Transient GPU out-of-memory failures (rare) are auto-retried up to twice server-side before surfacing as failed. Credits are never charged for a failed job.

Frequently asked questions