--- title: "GanttFather - 無料のオンライン ガント チャート ソフトウェア" description: "リアルタイム同期、Excel インポート/エクスポート、MCP 経由の AI エージェント統合を備えた無料のガント チャート ソフトウェア。クレジットカードは必要ありません。今すぐプロジェクトの管理を始めましょう。" canonical: "https://ganttfather.com/ja/" locale: "ja" category: "product" --- # GanttFather - 無料のオンライン ガント チャート ソフトウェア ![](https://ganttfather.com/_astro/logo-hero.SQPwNvFB_Zeiiwu.webp) GanttFather The Don of Project Management # Real scheduling power, without the learning curve. Dependencies, critical path, live collaboration, Kanban, Excel and AI agents — all a click away, none of it in your way. No workspace to configure before you can plan. [Start for free](https://app.ganttfather.com/login) [Browse templates](https://ganttfather.com/templates/) - Free forever tier - No credit card - Unlimited free viewers - 11 languages app.ganttfather.com ** Q1 Product Launch** Gantt List Board # Task Jan Feb Mar 1 **Discovery** 1.1 User research 1.2 Wireframes 2 Backend API 2.1 Integration 3 **Launch** Maria K. 6 tasks · 2 critical **PP 44%****SPI 0.55** Product ## Deep where it counts. Quiet everywhere else. One project, four ways to look at it — and the scheduling engine underneath doing the arithmetic. [All features →](https://ganttfather.com/ja/features/) Gantt List Board Reports ![GanttFather interactive Gantt chart with dependencies and critical path](https://ganttfather.com/landing/app-gantt.png) ### The timeline does the arithmetic Drag a bar and every dependent task moves with it. Finish-to-Start and the other three link types, lead and lag, cycle protection, and a full forward and backward pass for the critical path. - Auto-scheduling with cascade - Critical path and slack analysis - Unlimited hierarchy with rollups ### Dependencies FS, SS, FF and SF links with lead or lag, and cycle protection built in. ### Critical path Full CPM with slack analysis — see which tasks own your deadline. ### Live collaboration Cursors, presence and instant sync. Spectator links need no signup. ### Excel round-trip Import and export .xlsx with a diff preview before anything is written. ### AI agents & API 19 MCP tools for Claude, Cursor and Windsurf, plus a REST API. ### Version history Named snapshots you can preview as a ghost overlay, then restore. Compare ## Less tool. More schedule. Four things the others put behind a paid tier. All free here. [Full comparisons →](https://ganttfather.com/ja/article/#compare) On the free plan **Us** Asana ClickUp MS Project Task dependencies **✓** Paid Paid Paid Critical path + slack **✓** Paid Paid Paid Unlimited free viewers **✓** 10 seats Per seat Per seat AI agents over MCP **✓** — Paid — Resources ## Knowledge is power. [All 53 articles →](https://ganttfather.com/ja/article/) [Integrations & AI GanttFather API Reference: Automate Your Gantt Projects with REST Create tasks, update timelines and sync resources from scripts and AI workflows. Jul 6 · 9 min](https://ganttfather.com/docs/api/introduction/)[Compare Asana vs ClickUp 2026: Which Project Tool Wins? Pricing, Gantt, dependencies and automations — plus when a third option wins. Jun 28 · 11 min](https://ganttfather.com/ja/article/#compare)[Methodology Critical Path Method: the forward and backward pass, explained How slack is calculated, why the critical path moves, and what to do when it does. Jun 14 · 10 min](https://ganttfather.com/ja/article/) FAQ ## Questions worth asking. Still stuck? support@ganttfather.com ### Is GanttFather really free? Yes. The free plan includes 1 project you own with 2 editor seats and unlimited free viewers and guests, plus every feature — Gantt, Kanban, dependencies, critical path, Excel and AI agents. Editing a project someone else owns is always free too. ### What exactly am I paying for, then? Capacity, never features. Extra projects you own and extra editor seats — that is the whole price list. Full numbers are on the pricing page. ### How long until I have a working plan? About a minute from a template, or a few minutes from an Excel import. There is no workspace to configure, no permissions matrix, and no onboarding checklist to finish first. ### Can I connect AI agents to my projects? Yes. GanttFather speaks the Model Context Protocol, so Claude, Cursor, VS Code and Windsurf can create tasks, assign resources and read the Gantt chart directly. There is also a REST API with bearer-token auth. ### Can I share a project with a client? Generate a spectator link. External viewers see live project status in the browser without an account and without any ability to edit. ![](https://ganttfather.com/_astro/logo-hero.SQPwNvFB_1EYb7r.webp) ## An offer your projects can't refuse. Free forever for your first project — every feature included, no card, no trial clock. [See pricing](https://ganttfather.com/ja/pricing/)[Start for free](https://app.ganttfather.com/login)