Source: https://seerepo.com/compare/KittenML/KittenTTS/vs/vllm-project/vllm
Markdown source: https://seerepo.com/compare/KittenML/KittenTTS/vs/vllm-project/vllm.md
Description: KittenTTS and vllm share 8 technologies: FastAPI, Hugging Face, NVIDIA, torch, safetensors, transformers, einops, and torchaudio. Both are written in Python.

# KittenTTS vs vllm

KittenTTS and vllm share 8 technologies: FastAPI, Hugging Face, NVIDIA, torch, safetensors, transformers, einops, and torchaudio. Both are written in Python.

- [KittenML/KittenTTS](https://seerepo.com/r/KittenML/KittenTTS): Open-source State-of-the-art TTS model which runs on a CPU 😻 
- [vllm-project/vllm](https://seerepo.com/r/vllm-project/vllm): A high-throughput and memory-efficient inference and serving engine for LLMs

## What they share and what sets them apart

- In common: FastAPI, Hugging Face, NVIDIA, torch, safetensors, transformers, einops, torchaudio
- Only in KittenTTS: nvidia-cudnn-cu12, onnxruntime-gpu, librosa, diffusers, onnxruntime, phonemizer, s3tokenizer
- Only in vllm: axum, gitdb, pyzmq, Tokio, starlette, Ray, AIOHTTP, tower, mkdocs-material, indicatif, OpenAI, peft, quack-kernels, sentencepiece, triton, torchvision, datasets, MCP, tokenizers, tiktoken, markdown, markupsafe, pymdown-extensions, pillow, image, jinja2, Pydantic, msgspec, jsonschema, pydantic-core, opentelemetry-api, python-json-logger, tracing, prometheus-client, psutil, tracing-subscriber, OpenTelemetry, opentelemetry-sdk, prometheus-fastapi-instrumentator

## Side by side

| | KittenTTS | vllm |
|---|---|---|
| Size | 16,429 lines written, 42 code files | 2,375,117 lines written, 3,289 code files |
| Who writes it | 8.1% of its commits signed by AI. With Claude Code | 12.8% of its commits signed by AI. With Claude Code, Codex, Gemini CLI, Cursor, GitHub Copilot, Devin, Mistral Vibe, CodeRabbit, Factory, and Qwen Code |
| Activity | Last push October 27, 2026, 74 commits, 16,806 stars | Last push November 4, 2026, 24,593 commits, 96,302 stars |
| Tests | 9 test files. 54.8% of its code files have a test that imports them | 2,419 test files. 60.2% of its code files have a test that imports them |

- Size: Lines written by people and agents, without generated ones; code files, without tests.
- Who writes it: A commit counts as AI's when it carries its signature: a Co-Authored-By line, its author name or the merge of its branch.
- Activity: From GitHub and its history, on the day SeeRepo read it.
- Tests: The files that test the code, and the share of code files a test imports.

## Frequently asked questions

### Which is bigger, KittenTTS or vllm?

vllm, with 2,375,117 lines written; KittenTTS has 16,429.

The proof: [vllm-project/vllm's code at commit 75f6761](https://github.com/vllm-project/vllm/tree/75f67614971a44050140e3422c1a65fe5004a72b)

### Which has more GitHub stars, KittenTTS or vllm?

vllm, with 96,302 stars; KittenTTS has 16,806.

The proof: [vllm-project/vllm on GitHub](https://github.com/vllm-project/vllm)

### Which has more tests, KittenTTS or vllm?

vllm, with 2,419 test files; KittenTTS has 9.

The proof: [vllm-project/vllm's code at commit 75f6761](https://github.com/vllm-project/vllm/tree/75f67614971a44050140e3422c1a65fe5004a72b)

### Which was updated more recently, KittenTTS or vllm?

vllm: its last push was on November 4, 2026, and KittenTTS's on October 27, 2026.

The proof: [vllm-project/vllm's commits on GitHub](https://github.com/vllm-project/vllm/commits)

### Which has more commits signed by AI, KittenTTS or vllm?

vllm: an AI signed 12.8% of its commits, with Claude Code, Codex, Gemini CLI, Cursor, GitHub Copilot, Devin, Mistral Vibe, CodeRabbit, Factory, and Qwen Code; in KittenTTS, 8.1%.

The proof: [the commits each tool signed in vllm-project/vllm](https://seerepo.com/r/vllm-project/vllm/ai)

## Sources

- KittenML/KittenTTS: Read on November 7, 2026, at commit b9517e3 (https://github.com/KittenML/KittenTTS/tree/b9517e3050adced306219f8bea5f117d87ecfaa7)
- vllm-project/vllm: Read on November 4, 2026, at commit 75f6761 (https://github.com/vllm-project/vllm/tree/75f67614971a44050140e3422c1a65fe5004a72b)

## What is your repo built with?

Any public repo, with no account: https://seerepo.com/r/owner/repo/built, with the owner and name it has on GitHub.