--- title: "FastChat vs VirtualWife" type: "comparison" canonical_url: "https://www.graphcanon.com/compare/lm-sys-fastchat-vs-yakami129-virtualwife" tools: ["lm-sys-fastchat", "yakami129-virtualwife"] --- # FastChat vs VirtualWife *GraphCanon updated Jul 15, 2026* ## Verdict Pick FastChat when license: FastChat is Apache-2.0, VirtualWife is MIT; pick VirtualWife when license: VirtualWife is MIT, FastChat is Apache-2.0. [FastChat](https://github.com/lm-sys/FastChat) reports 39k GitHub stars, 4.8k forks, and 1.0k open issues, last pushed May 1, 2026. [VirtualWife](https://github.com/yakami129/VirtualWife) has 2.9k stars, 442 forks, and 45 open issues, last pushed Oct 27, 2024. Figures are from public GitHub metadata via [FastChat's repository](https://github.com/lm-sys/FastChat) and [VirtualWife's repository](https://github.com/yakami129/VirtualWife). | | [FastChat](/tools/lm-sys-fastchat.md) | [VirtualWife](/tools/yakami129-virtualwife.md) | | --- | --- | --- | | Tagline | An open platform for training, serving, and evaluating large language models | VirtualWife是一个虚拟数字人项目，支持B站直播，支持openai、ollama | | Stars | 39,494 | 2,870 | | Forks | 4,786 | 442 | | Open issues | 1,027 | 45 | | Language | Python | Python | | Adopt for | FastChat is a comprehensive open platform for managing large language models (LLMs) that includes capabilities for training, serving, evaluating, and comparing chatbot models via web UIs and RESTful APIs. It powers ChatB | - | | Persona | - | - | | Runtime | - | - | | License | Apache-2.0 | MIT | | Categories | Evaluation & Observability, Inference & Serving, LLM Frameworks, Model Training | Inference & Serving | ## Trust and health _Sourced signals - not a safety guarantee. No winner column._ | | [FastChat](/tools/lm-sys-fastchat.md) | [VirtualWife](/tools/yakami129-virtualwife.md) | | --- | --- | --- | | Maintenance | Steady (60%) | Dormant (18%) | | Days since push | 74d | 626d | | Open issues (now) | 1.0k | 45 | | Owner type | Organization | User | | Full report | [trust report](/tools/lm-sys-fastchat/trust.md) | [trust report](/tools/yakami129-virtualwife/trust.md) | ## Decision facts: FastChat - **Adopt for:** FastChat is a comprehensive open platform for managing large language models (LLMs) that includes capabilities for training, serving, evaluating, and comparing chatbot models via web UIs and RESTful APIs. It powers ChatB ## Choose when ### Choose FastChat if… - License: FastChat is Apache-2.0, VirtualWife is MIT. - Tags unique to FastChat: chatbots, distributed-serving, evaluation system, large-language-models. - Also covers Evaluation & Observability, LLM Frameworks, Model Training. - - You are looking to train and evaluate state-of-the-art models such as Vicuna or MT-Bench. ### Choose VirtualWife if… - License: VirtualWife is MIT, FastChat is Apache-2.0. - Tags unique to VirtualWife: chatgpt, docker, gpt, nodejs. - Leaner open-issue backlog (45). ## When NOT to use FastChat - - You require a proprietary or closed-source framework; FastChat is open-source under Apache-2.0 license and its use might be unsuitable for environments requiring proprietary solutions. - - Your chatbot evaluation needs do not align with the types of data used in FastChat's datasets (e.g., human votes, MT-Bench evaluations). - - You prefer a more user-friendly setup without the need to clone a repository and manually install dependencies; FastChat requires installation from source with additional steps for Rust and CMake on - + Mac. ## When NOT to use VirtualWife - Last GitHub push was 626 days ago (dormant maintenance, Oct 27, 2024). Validate activity before betting a new project on VirtualWife. - Inference & Serving: Self-hosting rarely beats a hosted API on cost until you have steady, high-volume traffic. ## Common questions ### What is the difference between FastChat and VirtualWife? FastChat: An open platform for training, serving, and evaluating large language models. VirtualWife: VirtualWife是一个虚拟数字人项目，支持B站直播，支持openai、ollama. See the comparison table for live GitHub stats and shared categories. ### When should I choose FastChat over VirtualWife? Choose FastChat over VirtualWife when License: FastChat is Apache-2.0, VirtualWife is MIT; Tags unique to FastChat: chatbots, distributed-serving, evaluation system, large-language-models; Also covers Evaluation & Observability, LLM Frameworks, Model Training; - You are looking to train and evaluate state-of-the-art models such as Vicuna or MT-Bench. ### When should I choose VirtualWife over FastChat? Choose VirtualWife over FastChat when License: VirtualWife is MIT, FastChat is Apache-2.0; Tags unique to VirtualWife: chatgpt, docker, gpt, nodejs; Leaner open-issue backlog (45). ### When should I avoid FastChat? - You require a proprietary or closed-source framework; FastChat is open-source under Apache-2.0 license and its use might be unsuitable for environments requiring proprietary solutions. - Your chatbot evaluation needs do not align with the types of data used in FastChat's datasets (e.g., human votes, MT-Bench evaluations). - You prefer a more user-friendly setup without the need to clone a repository and manually install dependencies; FastChat requires installation from source with additional steps for Rust and CMake on + Mac. ### When should I avoid VirtualWife? Last GitHub push was 626 days ago (dormant maintenance, Oct 27, 2024). Validate activity before betting a new project on VirtualWife. Inference & Serving: Self-hosting rarely beats a hosted API on cost until you have steady, high-volume traffic. ### Is FastChat or VirtualWife more popular on GitHub? FastChat has more GitHub stars (39,494 vs 2,870). Stars measure visibility, not whether either tool fits your constraints. ### Are FastChat and VirtualWife open source? Yes - both are open-source projects on GitHub (FastChat: Apache-2.0, VirtualWife: MIT). ### Where can I find alternatives to FastChat or VirtualWife? GraphCanon lists graph-backed alternatives at [FastChat alternatives](/tools/lm-sys-fastchat/alternatives) and [VirtualWife alternatives](/tools/yakami129-virtualwife/alternatives) ([FastChat markdown twin](/tools/lm-sys-fastchat/alternatives.md), [VirtualWife markdown twin](/tools/yakami129-virtualwife/alternatives.md)), ranked by typed relationship edges rather than popularity votes. ### Is there a machine-readable version of this comparison? Yes. The markdown twin at [this comparison](/compare/lm-sys-fastchat-vs-yakami129-virtualwife.md) mirrors this page for agents and LLM crawlers, with the same stats table and FAQ answers. ### Which is better maintained, FastChat or VirtualWife? FastChat: Steady. VirtualWife: Dormant. Compare maintenance labels, days since push, and release cadence in the trust section below - stars alone do not measure maintenance. ### Where are the full trust reports for FastChat and VirtualWife? GraphCanon publishes per-repo trust reports with dated maintenance, provenance, and scan summaries: [FastChat trust report](/tools/lm-sys-fastchat/trust); [VirtualWife trust report](/tools/yakami129-virtualwife/trust). --- **Machine-readable endpoints** - JSON: [`/api/graphcanon/graph?tool=lm-sys-fastchat`](/api/graphcanon/graph?tool=lm-sys-fastchat) - LLM index: [/llms.txt](/llms.txt) - Full corpus: [/llms-full.txt](/llms-full.txt) _GraphCanon - The knowledge graph for AI development. https://www.graphcanon.com/_