Open source text to speech software for windows

What is Text-to-Speech?

Text-to-speech or speech synthesis is an artificially generated human-sounding speech from text that recognize words and formulate human speech.

The first Text-To-Speech system was introduced to the world in 1968 by Noriko Umeda et al, at the Electrotechnical Laboratory in Japan.

In 1961, physicist John Larry Kelly, Jr and his colleague Louis Gerstman used an IBM 704 computer to synthesize speech, an event among the most prominent in the history of Bell Labs.

The benefits of TTS?

OpenTTS: Open Text to Speech ServerOpenTTS: Open Text to Speech Server

The primary advantageous of this technology are people with visual and reading impairments, as they were its first users.

People with dyslexia, or learning disabilities uses TTS to

Nowdays, many YouTube channels uses this technology in order to minimize their edit and increase their production.

In many modern operating system, Text-to-speech is a built-in accessibility feature to assist people who cannot read on-screen text easily.

About this list

In this article we offer you our collection of free, open-source Text-To-Speech (TTS) and speech synthesis apps.  


MARY TTS is an open-source, multilingual text-to-speech synthesis system written in pure java. It is available for Windows, Linux, and macOS.

MARY TTS is released under the LGPL-3.0 License.

2- Kaldi

Kaldi is a toolkit for speech recognition written in C++ and licensed under the Apache License v2.0.The source code is available at GitHub.

Kaldi can run on Windows, Linux, and macOS. It also can run on Android, PowerPC, and with Web Assembly.

3-  OpenTTS

OpenTTS is a free, open-source Open Text to Speech Server written in Python. It is released under the MIT License. It supports several languages, and comes with an easy-to-use interface. Furthermore, it comes with several alternatives libraries.

Supported languages: English (27), German (7), French (3), Spanish (2), Dutch (4), Russian (3), Swedish (1), Italian (2), Swahili (1), Finnish, Korean, Japanese, Chinese, Swedish, and more.

4- eSpeak

eSpeak is a compact open source software speech synthesizer for English and other languages, for Linux and Windows. It supports several languages, and comes with dozens of useful features, which makes it the ideal choice for many users.

Supported languages

Afrikaans, Albanian, Aragonese, Armenian, Bulgarian, Cantonese, Catalan, Croatian, Czech, Danish, Dutch, English, Esperanto, Estonian, Farsi, Finnish, French, Georgian, German, Greek, Hindi, Hungarian, Icelandic, Indonesian, Irish, Italian, Kannada, Kurdish, Latvian, Lithuanian, Lojban, Macedonian, Malaysian, Malayalam, Mandarin, Nepalese, Norwegian, Polish, Portuguese, Punjabi, Romanian, Russian, Serbian, Slovak, Spanish, Swahili, Swedish, Tamil, Turkish, Vietnamese, Welsh.

5- Text To Speech Converter

This open-source project allows you to convert any text into speech easily by copying and paste the text into its simple interface.  It is written in C# programming languages and runs on Windows for now.


ONLINE TTS is a simple HTML/ JavaScript project that turns your English text into a formidable speech.

ONLINE TTS features simple shortcuts, and a clean user-interface.

7- Flite

Flite is a small, fast run-time synthesis library suitable for embedded systems and servers. The core Flite library was developed by Alan W Black [email protected] (mostly in his so-called spare time) while employed in the Language Technologies Institute at Carnegie Mellon University.

Flite supports Windows, Linux, macOS, Android, FreeBSD, and several other systems.

8- Julius

Julius is an open-source large vocabulary continuous speech recognition engine.

It is a high-performance, small-footprint large vocabulary continuous speech recognition (LVCSR) decoder software for speech-related researchers and developers. Based on word N-gram and context-dependent HMM.

9- Athena

Athena is an open-source implementation of sequence-to-sequence based speech processing engine

Athena features

Hybrid Attention/CTC based end-to-end ASR

  • Speech-Transformer
  • Unsupervised pre-training
  • Multi-GPU training on one machine or across multiple machines with Horovod
  • End-to-end Tacotron2 based TTS with support for multi-speaker and GST
  • Transformer based TTS and FastSpeech
  • WFST creation and WFST-based decoding
  • Deployment with Tensorflow C++

10- ESPnet: end-to-end speech processing toolkit

ESPnet is an end-to-end speech processing toolkit, mainly focuses on end-to-end speech recognition and end-to-end text-to-speech.

It is a developer-friendly application that can integrated into web projects. Developers also can install it using Docker.

11- Voice Builder

Voice Builder is an open source text-to-speech (TTS) voice building tool that focuses on simplicity, flexibility, and collaboration. Our tool allows anyone with basic computer skills to run voice training experiments and listen to the resulting synthesized voice.

The Voice Builder project is written using JavaScript and released under the Apache-2.0 License.

12- Coqui TTS

Coqui TTS is a library for advanced Text-to-Speech generation. It’s built on the latest research, was designed to achieve the best trade-off among ease-of-training, speed and quality.

13- Mozilla TTS

Mozilla TTS is a library for advanced Text-to-Speech generation. It’s built on the latest research, was designed to achieve the best trade-off among ease-of-training, speed and quality.

14- Mycoft Mimic

Mycroft is an open-source voice assistant system. Mimic is the built-in TTS library created by Mycroft team.

If you know any other open-source TTS application, toolkit, or library that we didn’t mention here, let us know.

The Text-to-Speech Engine technology (more commonly known as TTS) is used to create a voice version of the text document.

The rise in the use of digital devices, and the growing dependence upon voice recognition and similar technologies, TTS is gaining prominence.

But, the applications of the technology don’t just stop there. With the help of this technology, you can convert the text emails into voice recordings. It can also help the visually challenged people to understand text content.

We will be looking at some of the best open source TTS engine tools through this blog. This will help us understand their features and benefits more clearly.

Top Open Source TTS Tools


MARY Text-to-Speech is a multilingual TTS synthesis platform that supports English (British and American), French, German, Italian, Russian, and many other languages.


  • Uses preprocessing techniques like tokenizer and numerical expansion.
  • It uses multi-threaded network architecture processes multiple requests in parallel.
  • It is flexible in nature so that you can use both pure Java models and external models.
  • It uses XML structures to improve transparency and is easy to understand for common users.


eSpeak is a compact open-source text to speech engine that is available for both Windows and Linux. It supports English and many other languages. Let us take a quick look at some of its key features:


  • This platform can easily do the text to phoneme translations. This helps the system to understand the meaning of the text and helps it to translate and pick up the pronunciations accordingly.
  • It comes with two synthesizers :
    • eSpeakinG synthesizer, which converts vowels and sonorant consonants to complete the sound with sound addition technology.
    • Klatt synthesizer uses a similar technique but with subtractive synthesis. It uses digital filters to understand the difference between consonants, vowels, and sonorants.
  • This tool was used by Google Translate in 2010 because of its differentiation technology and speed to convert the text into voice.
  • The sound quality of voices is clear and soothing to ears.


It is a lightning-fast, open-source TTS engine and its core features include:


  • As it is based on FLITE technology, you can customize how the voice sounds.
  • It is a small latency platform and uses a limited resource footprint.
  • It works seamlessly on Linux, Android, and Windows.
  • Currently, this tool is working on bringing realistic voices to people with speech disorders.

Also Read: Everything You Need to Know About Google Duplex


Festival Lite is more commonly known as Flite. It is a small, run time engine that is considered to be one of the fastest TTS engines.

As it is an open-source engine, it is free, and you can do many customizations. Hence many of the companies are opting for this TTS engine. Let us look at some of its core features:

  • It can be used for both small and large files.
  • It is thread-safe, and its latest version provides a hassle-free TTS conversion.
  • It is compatible with Windows, Linux, and Android.
  • It is also available in multiple languages.


MBROLA stands for Multi-Band Resynthesis OverLap Add. MBROLA is also one of the prominently used open-source TTS engines. And it provides support for many of the spoken languages. Let’s take a quick look at some of its key features:

  • It provides a multilingual database.
  • It is useful for in-house text to speech conversions.
  • It was a non-commercial software earlier but is now launched as an open-source TTS engine.
  • It provides pleasant sound quality with consistency and accuracy in voice pitch.


YakiToMe allows you to convert text files into voice files easily. You can download the voice files into MP3 audio files. Let us understand the salient features of it.

  • The engine not only supports .doc, txt, and .pdf files, but it also supports.HTML, RSS, and email files.
  • You can download the portable files and save them on your desktop, tablets, and smartphones.
  • It also provides a social platform from which you can search subscribe to files created by other users.
  • It offers support in English, French, and Spanish.
  • It provides voice, speech speed, and pronunciation controls.

Key Takeaways:

With the above-mentioned tools, we can understand that open source tts engines can be used widely to convert text from different languages. We can also use these engines to create social platforms, in-house utilities, and much more.

Written by Jane