Beautiful project planning in a single file. No install, no account, no monthly subscription. Open it in your browser and start planning in seconds.
Built for individuals and small teams who just need to get things done — without learning a new tool.
Colour-coded bars, today line, weekend shading, and smooth zoom from daily to monthly view. Drag bars to reschedule instantly.
Finish-to-Start, Start-to-Start, Finish-to-Finish and Start-to-Finish with optional lag days. Violated constraints highlight in red automatically.
Group tasks into phases with collapsible WBS hierarchy. Indent, outdent, and reorder rows with drag and drop.
Filter the entire Gantt to show only one team member's tasks. See who's overloaded at a glance.
Plans saved as .json files you own. Import from MS Project XML or Microsoft Planner. Auto-saves to your browser between sessions.
Group tasks by bucket — Dev, Design, QA — and assign custom colours. Subtasks automatically inherit their parent's colour.
No sign-up, no configuration, no waiting for IT to approve a new tool.
Click Download Free. You'll get a single gantto.html file — 100 KB, no dependencies.
Double-click the file. It opens in Chrome, Safari, Firefox or Edge. No server, no install, no internet connection required.
Add tasks, set dates, assign team members, add dependencies. Save your plan as a .json file whenever you like.
Free to use for as long as you like. Pay once for Solo, or wait for Team.
GANTTO-XXXX-XXXX-XXXX-XXXX. Enter it once via the 🔑 button in the app. It's validated entirely offline — no internet check, ever. The key is stored in your browser and persists across sessions.Download free and have your first plan ready in under a minute.