Grad-TTS
Don’t want to install Grad-TTS? Drop the file here.
The first 20 minutes of any recording are transcribed free: a recording up to 20 minutes transcribes in full, a longer one is previewed, and a pack from $6 (500 minutes) transcribes the rest and opens every export, and credits never expire.
Diffusion-probabilistic TTS reference implementation.
Best for researchers exploring diffusion-based TTS architectures. Pricing: free (MIT).
What it is
Grad-TTS is Huawei Noah's Ark Lab's diffusion-based TTS, one of the first applications of diffusion to speech synthesis. Demonstrates the lineage that StyleTTS 2 and F5-TTS extend. MIT. Consent posture: synthetic-only.
Watch out for: Research-grade; sampling can be slow without distillation.
Install / use
What people actually do with Grad-TTS-style transcription
The tool is the means. These are the jobs — each one priced at published rates, each one wired up on its own page.
Features
| Speaker diarization | No |
| Word-level timestamps | No |
| Streaming / real-time | No |
| Languages supported | 1 |
| HIPAA eligible | No |
Links
Grad-TTS vs Whipscribe
| Feature | Grad-TTS | Whipscribe |
|---|---|---|
| Category | Open source | Transcription APIs |
| Pricing | free (MIT) | $6–$24 one-time packs (credits never expire) · first 20 minutes free |
| Speaker identification | — | Named in the summary, key quotes and chapters |
| Word timestamps | — | Yes |
| Streaming | — | No |
| Languages | 1 | 99 |
| Platforms | Linux | Web, API, MCP |
Alternatives to Grad-TTS
Frequently asked about Grad-TTS
Is Grad-TTS free?
Yes. Grad-TTS is free and open source (free (MIT)).
Does Grad-TTS work on Mac, Windows and Linux?
Grad-TTS runs on Linux. It is not listed for other platforms; check the vendor for anything beyond Linux.
How do I install Grad-TTS?
Clone and run it from source: `git clone https://github.com/huawei-noah/Speech-Backbones`. Expect to install its dependencies yourself — the README has the exact steps per OS.
How many languages does Grad-TTS support?
Grad-TTS lists 1 languages.
Does Grad-TTS identify different speakers?
No. Grad-TTS does not label speakers; a conversation comes back as one continuous text. If you need speaker labels, that is a separate tool or a different service.
Does Grad-TTS give word-level timestamps?
No — Grad-TTS produces segment or sentence timing only, so subtitle cues can land mid-word.
Can Grad-TTS transcribe live audio?
No — Grad-TTS works on finished files, not a live stream.
Is Grad-TTS HIPAA compliant?
Grad-TTS does not claim HIPAA compliance. For PHI, run it on infrastructure you control or choose a service that will sign a BAA.
What are the limitations of Grad-TTS?
Research-grade; sampling can be slow without distillation.
Who is Grad-TTS best for?
Researchers exploring diffusion-based TTS architectures.
Does Grad-TTS run offline?
Grad-TTS runs on your own machine — it is open source, so nothing leaves the computer unless you configure it to.
Can I use Grad-TTS in the browser?
No — Grad-TTS is a Linux application, not a web app. You install it rather than sign in to it.
Where is the Grad-TTS source code?
On GitHub at github.com/huawei-noah/Speech-Backbones. It is maintained by Huawei Noah's Ark Lab.
What kind of tool is Grad-TTS?
In this directory Grad-TTS is filed under tts as a open-source tool.
What are the alternatives to Grad-TTS?
There is a side-by-side page at /tools/grad-tts-alternatives comparing Grad-TTS with the closest tools in the same category on price, platform and features.
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