Side by side
OpenTTS vs ResponsiveVoice
Both stand on text-to-speech software. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free plan APILinuxSelf-hosted+1
OpenTTS provides a unified, self-hosted route to many speech engines, with API endpoints and MaryTTS compatibility. Its archived, read-only repository means users should account for limited ongoing project maintenance.
Visit OpenTTS Free plan AndroidAPIiPhone+1
ResponsiveVoice combines broad platform access with API integration and commercial use. Its paid tiers increase monthly character capacity and website coverage, while voice cloning is unavailable.
Visit ResponsiveVoiceThe facts
| OpenTTS | ResponsiveVoice | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | Not published | Not published |
| Runs on | API, Linux, Self-hosted, Web | Android, API, iPhone, Web |
| Lowest paid plan | Free or on request | Starter: $9 a month |
| Plans published | 1 | 4 |
| Maker | Not published | ResponsiveVoice |
| Website | github.com | responsivevoice.org |
| On text-to-speech software | #48 of 223 | #68 of 223 |
OpenTTS: what it does well
- Free MIT-licensed open-source software
- HTTP API converts text to WAV
- Multiple speech engines and voices
- MaryTTS-compatible endpoint available
- Supports several Linux architectures
What to know first
- Repository is archived and read-only
- No published security policy or advisories
- Self-hosted Docker deployment required
- Only a subset of SSML is supported
ResponsiveVoice: what it does well
- Android, iOS, web and API platforms
- Commercial use is allowed
- MP3, OGG and WAV exports
- Free plan includes 1 million characters monthly
- API access is available
What to know first
- Inputs are limited to 4,000 characters
- Voice cloning is not provided
- Free plan covers one website
Alternatives to OpenTTS Alternatives to ResponsiveVoice The whole list