OpenAI.fm offers an interactive developer demo for the text to speech model in OpenAI’s API.
NeMo
vsTTS Online
NeMo vs TTS Online
How do NeMo and TTS Online compare? Here are the facts side by side: pricing, platforms, open-source status and what each one is for.
| Directory detail | NeMo | TTS Online |
|---|---|---|
| What it is | NVIDIA NeMo provides a framework for language, multimodal, and speech AI, including recognition and text to speech. | TTS Online converts text into speech with more than 100 voices in 27 languages and MP3 downloads. |
| Website | ||
| Type | Open-source project | Online tool |
| Topic | ||
| Pricing | Not confirmed | Free |
| Platforms | Not recorded | Web |
| Open source | Yes | Not stated |
| Language | English | English |
| Alternatives |
Other options to consider
Sites similar to both NeMo and TTS Online.
Voicemaker converts text to speech with more than 2,000 AI voices in 130 languages and lets users download audio in MP3 or WAV format.
Voice.ai provides AI voice agents, a voice changer and text-to-speech tools, with APIs and SDKs for scalable speech applications.
Freemium
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Generate speech from text with Zonos2, an open-weight mixture-of-experts model.
Open source
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Gemini 3.1 TTS converts text to expressive speech, with more than 70 languages and 30 voices listed on its page.
Woord converts text to speech with more than 100 voices and provides MP3 downloads and a text-to-speech API.