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 |
|---|---|---|---|---|---|
| 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 | 2014, April 6 | GPLv3+ | Free |
| Ekho | Cameron Wong | 2008, March 26 | 2018, September 7 | 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 |
? | 2019, March 31 | GPL | Free |
Technical voice details
| Platform | SSML | SAPI version | WS | PLS | CLI |
|---|---|---|---|---|---|
| Alfanum TTS | Yes | 4.x/5.x | ? | ? | ? |
| Apple PlainTalk | ? | ? | ? | ? | ? |
| AT&T Natural Voices | Yes | 5.1 | ? | ? | ? |
| Cepstral (company) | 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) |
|---|---|---|---|---|---|
| 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 |
|---|---|---|---|---|---|
| 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 | 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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