Sync Simple TODO List

One list, synced across your machines through your own Google Drive.

What this application is for

Sync Simple TODO List is a Firefox browser extension that keeps a single TODO list and synchronises it between the user's own computers using their own Google Drive account. Write your list on your PC, open your laptop, and it's there.

It exists for one purpose: keeping a plain, simple checklist available on every machine you use, without signing up for anything. There is no account to create and no service in the middle — the extension talks to Google's Drive API directly from your browser, and your list stays in your own Drive.

How this application uses Google Drive

The extension asks for a single Google permission, the drive.appdata scope, and uses it for exactly one thing: storing and retrieving one small JSON file containing your TODO items.

That file lives in appDataFolder, a hidden per-application folder inside your own Google Drive. This scope is the narrowest Drive permission Google offers — it grants access only to the folder this extension creates for itself, and to nothing else in your Drive. The extension cannot read, list, modify, or delete any of your other files, and it requests no other Google data.

Google Drive is contacted only after you explicitly choose to connect it. Until then, and if you never connect it, the extension works entirely offline as a local list. Full details are in the privacy policy.

What it does

Create, edit, delete and reorder items; mark them complete
Drag to reorder, or use the keyboard
Light and dark themes, following your system setting
Sync on demand, or automatically after every change
Fully keyboard navigable, with screen-reader support

Items are plain text plus a completed flag. No due dates, priorities, tags, or multiple lists — that's the point.

About your data

It stays in your own Google account

Your list syncs to a hidden folder in your own Drive, created by the extension for itself. There is no developer server involved at any point.

It can't see the rest of your Drive

The extension requests only the drive.appdata scope — the narrowest Drive permission Google offers. It reaches that one hidden folder and nothing else.

No tracking, no analytics, no sharing

Nothing is collected, and nothing is sent anywhere except Google's own APIs on your behalf.

How it is built

Plain JavaScript, HTML and CSS — no build step, no bundler, and no third-party dependencies of any kind. The extension is distributed through addons.mozilla.org, where every release is reviewed and signed by Mozilla before it can be installed.