Text-to-Speech

Service	Free Tier	Pricing Model	Docs
Amazon Polly	5M std + 1M neural	~$4 /M (std), ~$16 /M (neural) after free tier	Polly Docs
Google Cloud TTS	4M std + 1M WaveNet	~$4 /M (std), ~$16 /M (WaveNet) pay-as-you-go	Cloud TTS Docs
Azure TTS	500K neural ongoing	~$15 /M (neural), discount at higher volumes	Azure TTS Docs
IBM Watson TTS	10K chars Lite plan	~$0.02 /1K (i.e. ~$20 /M). Enterprise options available	IBM Watson Docs
ElevenLabs	10K chars monthly	From ~$5/mo (30K chars) up to $330/mo (2M chars). Enterprise	ElevenLabs Docs

Example Python Code

Amazon Polly

import boto3

polly = boto3.client("polly", region_name="us-east-1",
                     aws_access_key_id="YOUR_AWS_ACCESS_KEY_ID",
                     aws_secret_access_key="YOUR_AWS_SECRET_ACCESS_KEY")

resp = polly.synthesize_speech(
    Text="Hello from Polly!",
    OutputFormat="mp3",
    VoiceId="Joanna"
)

with open("polly.mp3", "wb") as f:
    f.write(resp["AudioStream"].read())

Google Cloud TTS

from google.cloud import texttospeech

client = texttospeech.TextToSpeechClient()
input_text = texttospeech.SynthesisInput(text="Hello from Google Cloud TTS!")
voice = texttospeech.VoiceSelectionParams(language_code="en-US")
audio_cfg = texttospeech.AudioConfig(audio_encoding=texttospeech.AudioEncoding.MP3)

resp = client.synthesize_speech(input=input_text, voice=voice, audio_config=audio_cfg)

with open("gcloud_tts.mp3", "wb") as f:
    f.write(resp.audio_content)

Azure TTS

import azure.cognitiveservices.speech as speechsdk

speech_config = speechsdk.SpeechConfig(
    subscription="AZURE_KEY", region="AZURE_REGION")
audio_cfg = speechsdk.audio.AudioConfig(filename="azure_tts.wav")

synthesizer = speechsdk.SpeechSynthesizer(
    speech_config=speech_config,
    audio_config=audio_cfg
)

synthesizer.speak_text_async("Hello from Azure TTS!").get()

IBM Watson TTS

from ibm_watson import TextToSpeechV1
from ibm_cloud_sdk_core.authenticators import IAMAuthenticator

auth = IAMAuthenticator("IBM_API_KEY")
service = TextToSpeechV1(authenticator=auth)
service.set_service_url("IBM_SERVICE_URL")

resp = service.synthesize(
    "Hello from IBM Watson!",
    voice="en-US_AllisonV3Voice",
    accept="audio/mp3"
).get_result()

with open("ibm_tts.mp3", "wb") as f:
    f.write(resp.content)

ElevenLabs

import requests

api_key = "ELEVENLABS_KEY"
voice_id = "ELEVENLABS_VOICE"
url = f"https://api.elevenlabs.io/v1/text-to-speech/{voice_id}"
headers = {"xi-api-key": api_key, "Content-Type": "application/json"}

json_data = {
    "text": "Hello from ElevenLabs!",
    "voice_settings": {"stability": 0.75, "similarity_boost": 0.75}
}

resp = requests.post(url, headers=headers, json=json_data)

with open("elevenlabs.mp3", "wb") as f:
    f.write(resp.content)