Aphrodite Engine vs FastChat
A side-by-side comparison of two self-hosted local llm runners options — licensing, setup difficulty, resource needs, and what each one replaces.
| Feature | Aphrodite Engine | FastChat |
|---|---|---|
| Deploy effort | Under-an-hour setup | Under-an-hour setup |
| Health score | 85 · Excellent | 69 · Good |
| Category | Local LLM Runners | Local LLM Runners |
| License | AGPL-3.0 | Apache-2.0 |
| Language | Python | Python |
| Setup difficulty | Hard | Hard |
| Min. RAM | 8,192 MB | 8,192 MB |
| Deployment | docker, source | docker, source |
| GitHub stars | ★ 1,866 | ★ 39,550 |
| First released | 2023 | 2023 |
| Replaces | OpenAI API | OpenAI API |
What are Aphrodite Engine and FastChat?
Aphrodite Engine
Aphrodite Engine is the official backend serving engine for PygmalionAI, optimized for high-throughput LLM inference. It exposes an OpenAI-compatible API and supports a wide range of quantization formats.
- High-throughput batching
- OpenAI-compatible endpoints
- Many quantization formats
- Continuous batching
FastChat
FastChat is an open platform for training, serving, and evaluating large language model chatbots. It powers the Chatbot Arena and provides an OpenAI-compatible API server for self-hosted models.
- OpenAI-compatible API
- Web UI for model chat
- Distributed serving
- Model evaluation tools
Aphrodite Engine vs FastChat: key differences
Both projects are written in Python. Licensing differs — AGPL-3.0 for Aphrodite Engine versus Apache-2.0 for FastChat. FastChat has the considerably larger community, at 39,550 GitHub stars versus 1,866.
Why pick each one
Choose Aphrodite Engine if…
- Released under the AGPL-3.0 license
- First-class Docker support for quick deployment
- Active community (1.9k GitHub stars)
- Written in Python
Choose FastChat if…
- OpenAI-compatible API
- Powers Chatbot Arena
- Multi-model serving
Watch out for
- GPU recommended
- Steep learning curve
Frequently asked questions
Is Aphrodite Engine or FastChat better?
Neither is universally better. FastChat has the larger community; both share a hard setup difficulty, so the decision comes down to features and licensing.
Are Aphrodite Engine and FastChat free and open-source?
Yes. Aphrodite Engine is licensed under AGPL-3.0 and FastChat under Apache-2.0. Both can be self-hosted at no software cost.
Can I run Aphrodite Engine and FastChat with Docker?
Aphrodite Engine: yes. FastChat: yes.