FreeTTS offers online tools for speech generation, transcription, vocal removal, voice enhancement, and audio editing.
AssemblyAI
AssemblyAI offers speech models for transcription and extracting information from voice data.
About AssemblyAI
AssemblyAI provides speech models and APIs that transcribe voice audio and extract information from it. Developers use them to build voice features into their own products. The platform includes a pre-recorded speech-to-text API, a realtime speech-to-text API, a speech understanding API, a voice agent API, and a dictation API. Transcripts are available in 99 languages. Deployment is listed as either self-hosted or cloud.
The Text-to-Speech API is listed as coming soon, so speech generation is not currently offered. The homepage does not state pricing, so cost information should be checked directly with the provider.
Key features
- Pre-recorded speech-to-text transcripts in 99 languages, with natural language prompting
- Realtime speech-to-text streaming for live audio input
- Speech understanding API for extracting context, intent, and meaning from voice data
- Dictation API returning text with filler words removed and self-corrections resolved
- Voice Agent API for building voice-based agents
- Self-hosted or cloud deployment options
Best for: Developers and product teams who want to add speech transcription or voice data analysis to their own applications, such as voice agents, call analytics, or AI notetaking.
Good for
- Offers both pre-recorded and realtime speech-to-text APIs
- Lists transcription support for 99 languages
- Provides self-hosted and cloud deployment options
Watch out for
- The Text-to-Speech API is listed as coming soon and is not yet available
- Pricing is not stated on the homepage
AssemblyAI at a glance
- Website
- assemblyai.com
- Category
- AI & Machine Learning › AI Speech Synthesis
- Type
- Online tool
- Pricing
- Not confirmed. Check the site
- Platforms
- Web
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
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AssemblyAI FAQ
Does AssemblyAI offer text-to-speech?
A Text-to-Speech API is listed on the homepage as coming soon, so it is not currently available.
How many languages are supported?
The homepage states that transcripts are available in 99 languages. English, Spanish, Portuguese, French, German, Russian, Hindi, Dutch, Japanese, and Italian are listed by name.
Can the platform be run on your own infrastructure?
The homepage lists a Self Hosted Voice AI option alongside a Cloud option under its inference section.
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