Comparison of speech synthesizers

Here is a non-exhaustive comparison of speech synthesis programs:

## Contents

* 1 General
* 2 Technical voice details
* 3 Technical details
* 4 Text-to-speech engines on Android

## General

Name  | Creator(s)  | First public release date  | Latest stable version  | Software license | Cost

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Alfanum TTS  | Alfanum  | 2004  | 2018  | Proprietary | ?
Apple PlainTalk | Apple Inc. | 1984  | 2018  | Bundled with Mac OS X | Bundled
AT&T Natural Voices  | AT&T Natural Voices  | ?  | 2008  | Proprietary | $295 – $995
Polly | Amazon AWS  | 2016  | 2019  | Proprietary | $4.00 per 1 million characters (free in 1st year)
Cepstral  | Cepstral  | 2000  | 2013  | Proprietary | $29+
CereProc | CereProc  | 2006  | 2017, February  | Proprietary | £25.99+
CPqD Texto Fala  | CPqD  | 1999  | 2016, March 1st  | Proprietary | ?
eSpeak | Jonathan Duddington  | 2006, February 10  | 2010, December 2  | GPLv3+ | Free
Ekho  | Cameron Wong  | 2008, March 26  | 2021, April 06  | GPLv2+ | Free
Expressive Speech  | Voxygen SAS  | 2011, September  | ?  | Proprietary | Not Free
Festival Speech Synthesis System | CSTR | ?  | 2014, December  | MIT-like license  | Free
FreeTTS | Paul Lamere
Philip Kwok
Dirk Schnelle-Walka
Willie Walker
...  | 2001, December 14  | 2009, March 9  | BSD | Free
LumenVox | LumenVox | 2011  | 2019  | Proprietary | ?
Microsoft Speech API | Microsoft | 1995  | 2012  | Bundled with Windows | Bundled
VoiceText | ReadSpeaker (Formerly Neospeech)  | 2002  | 2017  | Proprietary | ?
Nuance Vocalizer | Nuance Communications, Inc.  | ?  | 2018  | Proprietary | Not Free
Praat | Paul Boersma
David Weenink  | 1991  | 2021, February 28  | GPL | Free

## Technical voice details

Platform  | SSML | SAPI version  | WS  | PLS | CLI

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Alfanum TTS  | Yes  | 4.x/5.x  | ?  | ?  | ?
Apple PlainTalk | ?  | ?  | ?  | ?  | ?
AT&T Natural Voices  | Yes  | 5.1  | ?  | ?  | ?
Cepstral | Yes  | 5.x  | Yes  | Yes  | Yes
CereProc | Yes  | 5.x  | Yes  | Yes  | Yes
CPqD Texto Fala  | Yes  | ?  | Yes  | ?  | Yes
Ekho  | ?  | ?  | ?  | ?  | ?
eSpeak | Yes  | 5.x  | ?  | ?  | Yes
Expressive Speech  | 1.0/1.1  | 5.x  | ?  | Yes  | ?
Festival Speech Synthesis System | ?  | ?  | ?  | ?  | Yes
FreeTTS | ?  | ?  | ?  | ?  | ?
LumenVox | Yes  | 5.x  | Yes  | Yes  | Yes
Microsoft Speech API | 5.x only  | 4.x/5.x  | ?  | ?  | ?
Nuance Vocalizer | ?  | ?  | ?  | ?  | ?
Praat | ?  | ?  | ?  | ?  | ?
VoiceText | Yes  | 5.x  | ?  | ?  | ?

## Technical details

Name  | Online demo  | Available language(s)  | Available voices  | Programming language  | Operating system(s)

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Alfanum TTS  | Yes  | Serbian, Croatian  | 8  | C++  | Windows
Apple PlainTalk | ?  | English (United States), ...  | 15+  | ?  | Macintosh
AT&T Natural Voices  | Yes  | English (British), English (Indian), English (US), French, French (Canadian), German, Italian, Spanish (Latin American)  | 20  | C++  | Linux
Windows
AWS Polly | Yes  | Arabic (arb), Chinese, Mandarin (cmn-CN), Danish (da-DK), Dutch (nl-NL), English (Australian) (en-AU), English (British) (en-GB), English (Indian) (en-IN), English (US) (en-US), English (Welsh) (en-GB-WLS), French (fr-FR), French (Canadian) (fr-CA), German (de-DE), Hindi (hi-IN), Icelandic (is-IS), Italian (it-IT), Japanese (ja-JP), Korean (ko-KR), Norwegian (nb-NO), Polish (pl-PL), Portuguese (Brazilian) (pt-BR), Portuguese (European) (pt-PT), Romanian (ro-RO), Russian (ru-RU), Spanish (European) (es-ES), Spanish (Mexican) (es-MX), Spanish (US) (es-US), Swedish (sv-SE), Turkish (tr-TR), Welsh (cy-GB)  | 60
(male, female for most languages. For some languages child and different dialects are available)  | Undisclosed by AWS  | Cloud-based online software with API adoptable for all currently available operating systems
Cepstral  | Yes  | English (British), English (US), Italian, French (Canadian), German, Spanish (American), ...  | 25+  | C/C++  | Mac OS X
Windows
i386-Linux
x86-64-Linux
Sparc-Solaris
i386-Solaris
CereProc | Yes  | English (British), English (US), English (Scottish), English (Irish), French, French (Canadian), German, Austrian German, Italian, Irish, Spanish (Castilian), Spanish (Latin American), Dutch, Polish, Portuguese, Portuguese (Brazilian), Japanese, Catalan, Scottish Gaelic, Swedish, Russian, Mandarin  | 46  |

Java / C C++ / Objective C / Python / C# & .Net through SAPI

| Linux
Windows
Mac OS X
Embedded Linux
Android
iOS
Cloud service
CPqD Texto Fala  | Yes  | Brazilian Portuguese, Latin American Spanish, US English  | 5  | C, C++ and Java | Windows
Linux
Android
iOS
Ekho  | Yes  | Cantonese, Mandarin (standard Chinese), Zhaoan Hakka (a dialect in Taiwan), Tibetan, Ngangien (an ancient Chinese before Yuan Dynasty) and Korean  | 7  | C++ | Linux
Windows
Android
eSpeak | Samples  | Afrikaans, Albanian, Armenian, Cantonese, Catalan, Croatian, Czech, Danish, Dutch, English (British, US, Scottish, Westindies...), Esperanto, Estonian, Finnish, French (France, Belgium), Georgian, German, Greek, Hindi, Hungarian, Icelandic, Indonesian, Italian, Kannada, Kurdish, Latvian, Lojban, Macedonian, Malayalam, Mandarin, Norwegian, Persian, Polish, Portuguese, Romanian, Russian, Serbian, Slovak, Spanish, Swahili, Swedish, Tamil, Turkish, Vietnamese, Welsh.  | Several  | C++ | Linux
Windows
Mac OS X
RISC OS
Expressive Speech  | ?  | French, French (Canadian), French (African), UK English, US English, Spanish, German, Italian, Arabic, Wolof  | 50  | C/C++/Java/Python | Windows
Linux
Android
Festival Speech Synthesis System | Yes  | English (UK), English (US), Spanish, Hindi, Croatian, Finnish, Polish, Welsh.  | Several  | C++ | Linux
Windows
FreeTTS | ?  | English...  | Several  | Java | Cross-platform
LumenVox | Yes  | Danish, Dutch, English (Australian), English (US), English (UK), English (Welsh), English (Indian), French, French (Canadian), German, Icelandic, Italian, Polish, Portuguese, Portuguese (Brazilian), Romanian, Russian, Spanish (North American), Spanish (Latin American), Spanish (Castilian), Swedish, Turkish, Welsh, Welsh English  | 57  | C/C++ | Windows
Linux
Nuance Vocalizer | Yes  | US English, Australian English, Indian English, Irish English, South African English, UK English, Argentinian Spanish, Castilian Spanish, Colombian Spanish, Mexican Spanish, Arabic, Catalan, Basque, Galician, Dutch, Belgian Dutch, Portuguese, Brazilian Portuguese, Bulgarian, French, Canadian French, Cantonese (Hong Kong), Mandarin, Mandarin Taiwanese, Czech, Danish, Finnish, German, Greek, Hebrew, Hindi, Hungarian, Indonesian, Italian, Japanese, Korean, Norwegian, Polish, Romanian, Russian, Slovak, Swedish, Thai, Turkish  | 70+  | C/C++  | Windows
Linux
Android
Praat | ?  | ?  | ?  | C | Windows
Linux
Macintosh
FreeBSD
Solaris
VoiceText | Yes  | English (US), English (British), American Spanish, Canadian French, Chinese Mandarin, Japanese, Korean  | 13  | C/C++/Java | Windows
Linux

## Text-to-speech engines on Android

Name  | Creator(s)  | Available languages (voices)  | Latest version  | Last updated  | Google Play Store rating

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Voxygen - Expressive Speech  | Voxygen  | 6 (50)  | 1.6.0  | 2017-12  | varies (4-5)
Acapela TTS Voices  | Acapela Group  | 35 (100+)  | 4.0.0.6  | 2015-04-07  | 3.6 (2,111)
CereProc Text-to-Speech  | CereProc  | 11 (26)  | 4.0.5  | 2017-03  | varies
Eloquence Text-To-Speech  | Nuance  | 10  | 1.2.0  | 2015-03-02  | 4.3 (129)
eSpeak  | eSpeak  | 40+  | 1.46.02  | 2012-12-14  | 3.3 (1,762)
Google TTS  | Google  | 13 (16)  | ?  | 2015-04-07  | 4.0 (429,325)
IVONA Text-to-Speech HQ  | IVONA  | 13 (13)  | 1.6.42.524  | 2015-06-23  | 3.9 (14,413)
NeoSpeech NewsSpeak  | NeoSpeech  | 1 (7)  | 1.1.0  | 2014-12-30  | 4.8 (16)
SVOX Classic Text-to-Speech  | Nuance  | 25+ (40+)  | ?  | 2012-09-28  | 3.7 (15,740)
Vocalizer  | Nuance  | 36 (80+)  | 1.0.5  | 2015-04-23  | 3.5 (487)

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