Piper vs KittenTTS Nano
See how the two models differ in download size, language coverage, runtime needs, voice features, and output format. When both are available, use the same sentence to decide which voice works better for your project.
| Piper | KittenTTS Nano | |
|---|---|---|
| Parameters | 20M | 15M |
| Download | 27-115 MB per voice | 57 MB |
| Speed | Designed for fast CPU generation without requiring a dedicated GPU. | Runs faster than real time on many CPU-only devices with a 57 MB download. |
| Voices | 900 | 8 |
| Languages | 24 | 1 |
| Voice cloning | No | No |
| Streaming | No | No |
| Hardware | Any CPU (WASM) | Any CPU (WASM) |
| License | MIT (core) | Apache-2.0 |
| Output | 22.1 kHz | 24.0 kHz |
Which should you choose?
- Piper if its main focus matches your project: fast speech generation across a wide range of languages.
- KittenTTS Nano if its main focus matches your project: a small english model for lightweight devices.
- KittenTTS Nano if a smaller download is important; its listed download is 57 MB.
- Piper if you need languages beyond English (24 supported vs 1).
Frequently asked questions
Which sounds better, Piper or KittenTTS Nano?
There is no universal winner. Listen for pronunciation, pacing, and tone on the script you actually plan to use, then weigh that result against download size and device requirements. Both models are available here, so you can generate the same sentence with each.
Where do the speed and size details come from?
Model sizes and runtime requirements come from the maintained model records and linked upstream sources. Use the benchmark page to measure generation speed on your own device.