Comparison of speech synthesizers

Comparison of speech synthesizers

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

Creator(s) First public release date Latest stable version Software license Cost
Apple PlainTalk Apple Inc. 1984 2007, October 26 Bundled with Mac OS X Bundled
AT&T Natural Voices AT&T Natural Voices ? 2008 Commercial $295 - $995
Cepstral Cepstral ? ? Proprietary $29+
eSpeak Jonathan Duddington 2006, February 10 2011, April 25 GPLv3+ Free
Festival Speech Synthesis System CSTR ? 2010, November 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 ? Commercial ?
Kurzweil 1000 and Kurzweil 3000 Kurzweil Educational Systems, Inc. 1996 2005 Commercial ?
Loquendo Loquendo ? 2011 Commercial ?
Nuance Vocalizer Nuance Communications, Inc. ? ? Proprietary ?
Praat Paul Boersma
David Weenink		 ? 2011, September 11 GPL Free
Creator(s) First public release date Latest stable version Software license Cost

Technical voice details

Platform SSML SAPI version WS PLS CLI
Acapela  ? 5.1/5.3 Yes  ?  ?
AT&T Natural Voices Yes 5.1  ?  ?  ?
IVONA TTS 1.0/1.1 5.1 /5.3 Yes 1.0 Yes
eSpeak
Festival Speech Synthesis System
FreeTTS
Kurzweil 1000 and Kurzweil 3000
Loquendo
Nuance Vocalizer
Praat

Technical details

Online demo Available language(s) Available voices(s) 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+ ? Mac OS X
Windows
i386-Linux
x86-64-Linux
Sparc-Solaris
i386-Solaris
eSpeak Samples English… Several C++ Linux
Windows
Mac OS X
RISC OS
Festival Speech Synthesis System Yes English… Several C++ Linux
Windows
FreeTTS ? English… Several Java Cross-platform
IVONA TTS Yes English (British), English (US), German, American Spanish, Castilian Spanish, French, Welsh, Welsh English, Polish, Romanian 26 C/C++ Windows
Linux
Kurzweil 1000 and Kurzweil 3000 ? ? ? ? ?
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
Nuance Vocalizer Yes English (Australian), English (British), English (US), Portuguese (Brazilian), French (Canadian), German, Spanish (Latin American) 10+ C/C++ ?
Praat ? ? ? C Windows
Linux
Macintosh
FreeBSD
Solaris
Online demo Available language(s) Available voices(s) Programming language Operating system(s)

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