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JanJan

Menlo Research

开源Open source Apache2.0署名Apache-2.0 attribution 桌面应用Desktop application 离线Offline GGUFGGUF partial lifecycle: active 核验Checked 2026-10-30

Jan 是「开源版 ChatGPT 桌面替代」的长期主义者：100% 离线跑本地模型，Apache-2.0 主体加一句署名请求。诚实标注：GitHub API 标 NOASSERTION 是机器判不了附加署名句——读 LICENSE 原文才准；官网直连 000（网络受限非死亡）。

Jan is the long-standing open-source 'offline ChatGPT replacement': 100% offline local models, Apache-2.0 core plus an attribution request. Honest notes: the GitHub API's NOASSERTION flag comes from that extra sentence — read the LICENSE itself; the site measured 000 direct (network-limited, not dead).

适合与不适合When to use it, when not to

适合：要开源可审计的桌面离线聊天、要内置 OpenAI 兼容本地端点。不适合：服务化部署；要最顺滑的模型获取体验。

Fits: auditable open-source offline desktop chat, built-in OpenAI-compatible local endpoint. Not a fit: serving deployments; the smoothest model-acquisition experience.

中文生态China availability 国产 / 国内可直接用 / 备案状态 · 快照domestic / direct access / CAC filing · snapshot 2026-10-21

出品属地Origin: 国外出品foreign-made　Menlo Research（美国/新加坡背景的研究机构）。Menlo Research (US/Singapore-background research org).
国内使用Direct access: 直连不可达direct blocked　www.jan.ai 直连实测 000（网络受限，非死亡判定；经代理可达 200）。www.jan.ai measured 000 direct (network-limited, not a death verdict; 200 via proxy).
备案状态CAC filing: 未见于备案名单not in filing list：未见于网信办公示名单（2026-10-21 检索）；该产品未面向大陆公众提供服务，备案不适用。not in the CAC public registry (searched 2026-10-21); the product does not serve the mainland public, so filing does not apply.

备案信息以网信办《生成式人工智能服务已备案信息》公示名单为准（按批次滚动更新，本站只抄编号不解读）；「大陆可直连」是本站从大陆网络直连实测的结果，不是厂商承诺。GitHub 类站点当日实测有波动，口径写在依据里。Filing status is quoted from the CAC public registry (updated batch by batch; this site copies the number and does not interpret it). "Direct access" is this site's own reachability measurement from a mainland network, not a vendor promise. GitHub-hosted sites fluctuated on the measurement day — the note says so.

固定坐标系Fixed coordinate system

8 个维度dimensions, 与同分区其他对象逐项可比each comparable item by item against others in the same section.

模型与开放条件Model & openness: 官方定位「100% offline on your computer」（仓库描述直抓所见）；GGUF 本地模型为主，模型清单随版本滚动，未逐条清点。
Official positioning "100% offline on your computer" (as seen in the repo description, direct-fetched); GGUF local models are the mainstay, the model list rolls with versions, not inventoried item by item.
运行位置Where it runs: 桌面应用（Jan 自研运行时 jan-core/jan-engine 线）；GitHub 45,158★（API 核验 2026-10-21）。仓库现归 Menlo Research 名下（janhq/jan；menloresearch/jan 为旧路径 301 跳转，直抓核验）。
Desktop app (Jan's own runtime: the jan-core/jan-engine line); GitHub 45,158★ (API verified 2026-10-21). The repo now sits under Menlo Research (janhq/jan; menloresearch/jan is the old path with a 301 redirect, direct-fetch verified).
本地文件Local files: 对话与模型全落本机（官方「100% offline on your computer」口径，仓库描述直抓所见）。
Conversations and models all land on your machine (the official "100% offline on your computer" stance, as seen in the repo description, direct-fetched).
关机后的任务Tasks after shutdown: 应用内置本地 API server（OpenAI 兼容）可常开；细节未逐条核验。
A built-in local API server (OpenAI-compatible) can stay on; details not verified item by item.
工具与扩展Tools & extensions: 插件/扩展生态在官方文档线内；MCP 支持状态未逐条核验，第三方扩展质量未清点。
A plugin/extension ecosystem is within the official docs line; MCP support status not verified item by item, third-party extension quality not inventoried.
上下文与记忆Context & memory: 会话上下文管理在应用内；跨会话记忆与长期记忆未见官方声明（未核验到≠没有）。
Session context management is in-app; cross-session memory and long-term memory — no official statement seen (not-verified ≠ absent).
权限与限制Permissions & limits: 桌面应用权限随操作系统授权；无账号体系，离线定位下未见云同步权限面。
Desktop-app permissions follow the OS grant; no account system, and under the offline positioning no cloud-sync permission surface seen.
适合什么任务Best for: 适合：要开源的桌面 GUI 跑离线模型（对比闭源的 LM Studio）。不适合：要服务化多模型部署；要开箱即用最新模型（模型获取体验弱于 Ollama）。
Fits: wanting an open-source desktop GUI for offline local models (vs closed-source LM Studio). Does not fit: service-style multi-model deployment; wanting latest models out of the box (the model-acquisition experience is weaker than Ollama's).

头号误解Top misconception

把 NOASSERTION 当「许可不明」——读 LICENSE 原文是 Apache2.0+署名请求，GitHub 标记只是机器判不了附加句Reading NOASSERTION as 'license unclear' — the LICENSE is Apache-2.0 plus an attribution request; the API flag just cannot parse the extra sentence
用旧仓名 menloresearch/jan 找仓库——现路径 janhq/jan（旧路径 301 跳转仍可达）Using the old path menloresearch/jan — the repo now lives at janhq/jan (old path 301s)
把「开源」与「模型免费」混谈——权重许可跟着模型走Mixing up 'open source' with 'models are free' — weight licenses follow the model

未知项清单Known unknowns

jan-core/jan-engine 运行时的模型格式支持矩阵（未逐条核验）
MCP 支持状态（未逐条核验）
署名要求的法律约束力边界（Apache 附加句是请求还是条件——本站不做法律判断）

The model-format support matrix of the jan-core/jan-engine runtime (not verified item by item)
MCP support status (not verified item by item)
The legal-binding boundary of the attribution request (is the Apache extra sentence a request or a condition — this site makes no legal judgment)

证据来源Evidence sources

判断可回到以下一手源复核。本站核验日Every judgement can be rechecked against the primary sources below. Verified on 2026-10-30，内容更新日content updated on 2026-10-21。

类型Type	名称Name	链接Link
docs	janhq/jan · LICENSE（Apache2.0+署名请求，2026-10-21 直抓核验）janhq/jan · LICENSE (Apache2.0 + attribution request, direct-fetched and verified 2026-10-21)	https://github.com/janhq/jan/blob/main/LICENSE
repo	janhq/jan · 仓库（45,158★，最近推送 2026-10-30，GitHub API 核验）janhq/jan · repo (45,158★, last push 2026-10-30, GitHub API verified)	https://github.com/janhq/jan
docs	Jan · 官网Jan · official site	https://www.jan.ai
changelog	janhq/jan · Releases（changelog）janhq/jan · Releases (changelog)	https://github.com/janhq/jan/releases

实测记录Measured runs

本档未跑吞吐与显存实测；结论只覆盖运行时能力与许可。

This site has not completed measured runs. The closest test protocol is the code-side protocols/framework/_protocol.md (the local-endpoint and credential-boundary sections are reusable; no runner-specific protocol exists on this site yet).