IBM Watson Text to Speech vs Inworld TTS
IBM Watson Text to Speech
ibm.com
Inworld TTS
inworld.aiSide by side
| Figure | IBM Watson Text to Speech | Inworld TTS |
|---|---|---|
| Price from | Free | $25/mo |
| Free plan | Yes | Yes |
| Free trial | Yes | — |
| Open source | — | — |
| Web | — | Yes |
| API | Yes | Yes |
| Self-hosted | Yes | — |
| Plans published | 7 | 6 |
| Spec score · Text-to-speech tools | 8.6 (#43) | 9.1 (#12) |
| Spec score · Text-to-Speech Software | 8.4 (#63) | 8.9 (#18) |
| Spec score · AI voice generators | 8.3 (#14) | 8.8 (#6) |
| API access | Yes | Yes |
| Export formats | A-law,Basic audio,FLAC,Linear 16-bit PCM,MP3,Mu-law,Ogg,WebM,WAV | MP3,WAV,Opus |
| Free plan | Yes | Yes |
| Languages | 9 | 200 |
| Maximum input | 5000 | 40000 |
| Platforms | api,self_hosted | web,api |
| Voice cloning | Yes | Yes |
Plans
IBM Watson Text to Speech
- LitePriced on request
- StandardPriced on request
- PremiumPriced on request
- LiteFree
- StandardPriced on request
- Deploy AnywherePriced on request
- PremiumPriced on request
Inworld TTS
- On-DemandFree
- Creator$25 a month
- Builder$100 a month
- Developer$300 a month
- Growth$1,500 a month
- EnterprisePriced on request
In their own words
IBM Watson Text to Speech
IBM Watson Text to Speech is an API cloud service that converts written text into audio in multiple languages and voices, for applications or watsonx Assistant. Deep neural networks trained on human speech produce its neural voices. SSML controls can change pronunciation, volume, pitch, speed, and other attributes; unusual pronunciations can be specified with IPA or IBM SPR. Listed speaking styles include GoodNews, Apology, and Uncertainty, and voice transformation can adjust strength, pitch, breathiness, rate, and timbre. The service supports nine languages and accepts up to 5,000 input units. Export formats include A-law, Basic audio, FLAC, Linear 16-bit PCM, MP3, Mu-law, Ogg, WebM, and WAV. Deployment options include public, private, hybrid, multicloud, and on-premises infrastructure. Deploy Anywhere is billed by contacting IBM. Premium can include a custom branded neural voice modeled on a chosen speaker using as little as one hour of recordings.
Inworld TTS
Inworld TTS has no write-up on Specifiction yet; its figures are above.