# Open Text to Speech (OpenTTS)

> Free, public, high-performance neural text-to-speech platform with 583 studio voices across 110 countries and 76 languages. Sub-millisecond cached delivery (< 1.0 ms), zero API keys, and zero registrations.

## Core Resources

- [Web Studio](https://opentexttospeech.com/studio): Interactive TTS speech studio with live waveform visualization, vocal pitch, tempo, volume modulation, and cadence controls.
- [Voice Catalog](https://opentexttospeech.com/voices): Complete searchable catalog of 583 neural voices filterable by language, country, and gender.
- [Audio Tools Directory](https://opentexttospeech.com/tools): Suite of dedicated audio tools including Audiobook Storyteller, YouTube Voiceover, and Meditation Voice generators.
- [Cloud TTS Comparisons](https://opentexttospeech.com/compare): In-depth architectural and pricing benchmarks comparing OpenTTS against ElevenLabs, Google Cloud TTS, Amazon Polly, and Azure Speech.
- [Machine-Readable Pricing](https://opentexttospeech.com/pricing.md): Complete $0.00 pricing specification, 2,000 char limit, and 30 req/min rate limits for automated procurement agents.
- [Full LLM Knowledge Bundle](https://opentexttospeech.com/llms-full.txt): Comprehensive technical specification including complete REST API parameters, code snippets (cURL, Python, JavaScript), and pause syntax tags.

## Audio Tools

- [Free Text to Speech](https://opentexttospeech.com/tools/text-to-speech-free): Universal neural speech generator with live playback and multi-format audio downloads.
- [Audiobook Voice Generator](https://opentexttospeech.com/tools/audiobook-voice-generator): Pre-tuned narrative cadence for long-form literature, novel chapters, and audiobooks.
- [YouTube Voiceover Generator](https://opentexttospeech.com/tools/youtube-voiceover): High-energy vocal delivery and pacing optimized for video creators and short-form media.
- [Meditation Voice Generator](https://opentexttospeech.com/tools/meditation-voice-generator): Calming, tranquil cadence with breathing pauses for wellness and mindfulness audio.
- [Podcast Intro Generator](https://opentexttospeech.com/tools/podcast-intro-generator): Authoritative broadcast pacing and articulation for podcast openers and news broadcasts.
- [Pause Syntax Tester](https://opentexttospeech.com/tools/pause-syntax-tester): Real-time cadence inspector and acoustic punctuation tag parser.

## International Portals (14 Languages)

- [English Portal](https://opentexttospeech.com/): Global English speech generation hub.
- [Spanish (Español)](https://opentexttospeech.com/es): Portal de síntesis de voz neuronal en español.
- [French (Français)](https://opentexttospeech.com/fr): Portail de synthèse vocale neuronale en français.
- [German (Deutsch)](https://opentexttospeech.com/de): Deutsches neuronales Text-to-Speech-Portal.
- [Japanese (日本語)](https://opentexttospeech.com/ja): 日本語ニューラル音声合成ポータル。
- [Chinese (简体中文)](https://opentexttospeech.com/zh): 中文神经文本转语音生成器。
- [Arabic (العربية)](https://opentexttospeech.com/ar): بوابة تحويل النص إلى صوت باللغة العربية.
- [Portuguese (Português)](https://opentexttospeech.com/pt): Portal de conversão de texto em fala em português.
- [Hindi (हिन्दी)](https://opentexttospeech.com/hi): हिंदी न्यूरल टेक्स्ट-टू-स्पीच पोर्टल।
- [Italian (Italiano)](https://opentexttospeech.com/it): Portale di sintesi vocale neurale in italiano.
- [Russian (Русский)](https://opentexttospeech.com/ru): Портал нейронного синтеза речи на русском языке.
- [Korean (한국어)](https://opentexttospeech.com/ko): 한국어 신경망 텍스트 음성 변환 포털.
- [Turkish (Türkçe)](https://opentexttospeech.com/tr): Türkçe yapay zeka metin okuma portalı.
- [Dutch (Nederlands)](https://opentexttospeech.com/nl): Nederlandse neurale tekst-naar-spraak portal.

## Optional

- [XML Sitemap](https://opentexttospeech.com/sitemap.xml): Full XML sitemap index of all pages, voices, languages, and tools.
- [Robots Policy](https://opentexttospeech.com/robots.txt): Crawler indexing and agent permissions.