Is iGanttChart: Gantt Chart App safe to install?

What data it declares

The developer declares that it does not collect or use your data.

The developer also certifies that your data is not sold to third parties outside approved uses, not used for purposes unrelated to the extension's core function, and not used to decide creditworthiness or lending.

The listing links to a privacy policy.

This is the developer's own declaration in the Chrome Web Store. We cannot check it against what the extension does.

What Chrome asks you to allow

When you add it, Chrome asks you to allow it to:

• Know your email address

Derived from the manifest by Chrome's documented rules; the dialog's exact wording depends on your Chrome version and language. Chrome asks again if an update requests more.

What it can reach

No site access is declared in the manifest, so it cannot read the pages you open on its own.

Worth knowing

• Sign you in with a Google account identity
• See the email address of the signed-in Google account identity.email

Sites that can connect to it

Web pages matching these patterns can open a messaging channel to it: 1 site pattern.

• https://ganttchart.tanaike.jp/* only ganttchart.tanaike.jp

Declared as externally connectable in the manifest: a page on these sites can exchange messages with the extension, for example to tell it you have signed in. It does not give the page access to your browser.

How usual this is for its category

In Productivity · Tools, 20% of extensions ask for access to every site. This one: No site access.

The typical extension there declares 3 browser permissions; this one declares 2 browser permissions.

Counted over the live extensions of the same category after our latest full pass of the store. A share is context, not a verdict: what is normal depends on what the extension is for.

Who uses it and how it is kept up

106 users

• Last updated in the store 212 days ago, on 2026-03-31.
• No new version in the last 90 days.

What the store shows

• Established publisher The store's badge for publishers with a good record and no history of violations.

The listing says it offers in-app purchases.

Has it asked for more over time?

This is the question a permission list on its own cannot answer. An extension that shipped narrow and widened later is a different proposition from one that always asked for the same thing.

The permissions this extension requests have not changed since we started watching it.

Who publishes it

Yuki Tanaike, who publishes 20 listings we track. This listing has been in the store since 2026-03-25 and was last updated on 2026-03-31.

Similar extensions that ask for less

Listings close to this one in what they say they do, which declare less reach. Less reach is not a verdict on either: compare what each needs for the job.

1. TeamGantt Project Management No permissions at all · No permissions declared 10k users ★ 4.2
2. PlanHammer No permissions at all · No permissions declared 353 users ★ 3.3
3. ClickUp Dateless Timeline No permissions at all · No permissions declared 9 users

How to check or remove it in Chrome

1. Type chrome://extensions in the address bar and find the extension in the list.
2. Open its details. The site access setting shows where it can run; set it to run only on click and it reaches a page only after you press its icon.
3. To uninstall it, choose Remove on the same page.

Questions people ask

What can iGanttChart: Gantt Chart App access?

No site access is declared in the manifest, so it cannot read the pages you open on its own. It declares 2 browser permissions.

What data does iGanttChart: Gantt Chart App collect?

The developer declares that it does not collect or use your data. This is the developer's own declaration in the Chrome Web Store. We cannot check it against what the extension does.

Has iGanttChart: Gantt Chart App asked for more permissions over time?

The permissions this extension requests have not changed since we started watching it.

Does iGanttChart: Gantt Chart App publish a privacy policy?

Yes, the store listing links to a privacy policy.