Comparison of speech synthesizers
Here is a non-exhaustive comparison of speech synthesis programs:
General
| Name | Creator(s) | First public release date | Latest stable version | Software license | Cost |
|---|---|---|---|---|---|
| Innoetics TTS | Innoetics | 2006, March | 2016, December | Proprietary | €29 – €885 |
| Apple PlainTalk | Apple Inc. | 1984 | 2007, October 26 | Bundled with Mac OS X | Bundled |
| AT&T Natural Voices | AT&T Natural Voices | ? | 2008 | Proprietary | $295 – $995 |
| Cepstral | Cepstral | 2000 | 2013 | Proprietary | $29+ |
| CereProc | CereProc | 2006 | 2015, December | Proprietary | £25.99+ |
| CPqD Texto Fala | CPqD | 1999 | 2016, March 1st | Proprietary | ? |
| eSpeak | Jonathan Duddington | 2006, February 10 | 2014, April 6 | GPLv3+ | Free |
| Ekho | Cameron Wong | 2008, March 26 | 2013, January 15 | GPLv2+ | 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 |
| IVONA TTS | IVONA Software | 2005 | ? | Proprietary | Free for Android |
| Loquendo | Loquendo | 1975 | 2011 | Proprietary | ? |
| LumenVox | LumenVox | 2011 | 2016 | Proprietary | ? |
| Neospeech | Neospeech | 2002 | 2013 | Proprietary | ? |
| Nuance Vocalizer | Nuance Communications, Inc. | ? | 2013 | Proprietary | ? |
| Praat | Paul Boersma David Weenink |
? | 2014, December 28 | GPL | Free |
| SVOX | Nuance Communications, Inc. | ? | ? | Proprietary | ? |
| SYNVO | SYNVO | 2011 | ? | Proprietary | ? |
| Voxygen Expressive Speech | Voxygen SAS | 2011, September | ? | Proprietary | ? |
Technical voice details
| Platform | SSML | SAPI version | WS | PLS | CLI |
|---|---|---|---|---|---|
| AT&T Natural Voices | Yes | 5.1 | ? | ? | ? |
| Cepstral (company) | Yes | 5.x | Yes | Yes | Yes |
| CereProc | Yes | 5.x | Yes | ? | Yes |
| CPqD Texto Fala | Yes | Yes | Yes | ||
| IVONA TTS | 1.0/1.1 | 5.1 /5.3 | Yes | 1.0 | Yes |
| eSpeak | Yes | 5.x | Yes | ||
| Festival Speech Synthesis System | Yes | ||||
| FreeTTS | |||||
| Loquendo | |||||
| LumenVox | Yes | Yes | Yes | Yes | |
| Neospeech | Yes | 5.x | |||
| Nuance Vocalizer | |||||
| Praat | |||||
| SVOX | |||||
| Voxygen Expressive Speech | Yes | 5.x | ? | Yes | ? |
Technical details
| Name | Online demo | Available language(s) | Available voices | Programming language | Operating system(s) |
|---|---|---|---|---|---|
| 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 |
| 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, German, Austrian German, Italian, Spanish (Castilian), Spanish (Latin American), Dutch, Portuguese, Portuguese (Brazilian), Japanese, Catalan, Scottish Gaelic | 31 | C / Python
SDK available for: 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 |
| 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 (Farsi), Polish, Portuguese, Romanian, Russian, Serbian, Slovak, Spanish, Swahili, Swedish, Tamil, Turkish, Vietnamese, Welsh. | Several | C++ | Linux Windows Mac OS X RISC OS |
| 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 |
| 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 |
| IVONA TTS | Yes | Danish, Dutch, English (Australian), English (US), English (UK), English (Welsh), French, French (Canadian), German, Icelandic, Italian, Polish, Portuguese (Brazilian), Romanian, Russian, Spanish (American), Spanish (Castilian), Welsh | 43 | C/C++ | Windows Linux Android |
| Neospeech | Yes | English (US), English (British), American Spanish, Canadian French, Chinese Mandarin, Japanese, Korean | 13 | C/C++/Java | Windows Linux |
| Nuance Loquendo | Yes | English (Australian), English (British), English (US), Castilian Spanish, Catalan, Valencian, Galician, French, German, Italian, Greek, Portuguese, Swedish, Dutch, Polish, Brazilian Portuguese, Mandarin Chinese, Mexican Spanish, Chilean, Argentinean, American Spanish, Canadian French, Turkish, Finnish, Russian, Danish, Norwegian, Arabic, Romanian | 74 | ? | Windows Linux |
| 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 |
| Nuance SVOX | ? | ? | ? | ? | Android |
| Voxygen Expressive Speech | Yes | French, French (Canadian), French (African), English, Spanish, Italian, Arabic | 47 | C/C++, Java and Python | Windows Linux Android |
Text-to-Speech Engines on Android
| Name | Creator(s) | Available languages (voices) | Latest version | Last updated | Google Play Store rating | Cost / voice | Demo |
|---|---|---|---|---|---|---|---|
| Acapela TTS Voices | Acapela Group | 35 (100+) | 4.0.0.6 | 2015-04-07 | 3.6 (2,111) | €3.99 | all |
| CereProc Text-to-Speech | CereProc | 11 (26) | ? | ? | ? | $1.6 | US English |
| Eloquence Text-To-Speech | Nuance | 10 | 1.2.0 | 2015-03-02 | 4.3 (129) | $20.34 / 10 | US English |
| eSpeak | eSpeak | 40+ | 1.46.02 | 2012-12-14 | 3.3 (1,762) | free | ? |
| Google TTS | 13 (16) | ? | 2015-04-07 | 4.0 (429,325) | free | all | |
| IVONA Text-to-Speech HQ | IVONA | 13 (13) | 1.6.42.524 | 2015-06-23 | 3.9 (14,413) | free while beta | all |
| 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) | $4.29 | US English |
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