A Gantt chart add-on for Google Sheets that draws the chart into your spreadsheet rather than into a sidebar panel.
That one decision is the product. A sidebar is an iframe served from another origin, and when a browser has several Google accounts signed in it is routinely attributed to the wrong one — which is why the established add-ons ship help pages about reloading and waiting. A chart written into a tab has nothing to attribute: it works with any number of accounts signed in, in every browser, and it is still there when the add-on is not running. It prints, it shares, and it survives.
Two permissions:
| Permission | What it allows |
|---|---|
| See, edit, create and delete only the specific Google Sheets file you use it with | Read your task list and write the chart into a tab of that same file |
| Display and run third-party web content in prompts and sidebars | Show the add-on’s menu and dialog boxes |
Google’s install screen adds your name and email address to that list. Every Marketplace add-on requests those and a developer cannot remove them; the add-on itself never reads them.
It has no permission to access the internet, so nothing in your spreadsheet can leave it. See the privacy policy for what that means in practice.
Free charts up to 50 tasks, with no limit on how long the project runs — the timeline changes scale instead, so a two-week sprint and a five-year programme both fit on a screen.
Pro removes the task limit and adds dependency labels, custom chart colours, and no watermark.