Mail that stays in sync
Download and display Gmail inbox messages, search locally synced mail, and keep read and unread state aligned with Google. Compose and send a message only when you choose Send.
Local-first mail for Windows
Your inbox.Under your control.
Northstar Mail is a local-first Windows desktop email client for reading, searching, and sending Gmail messages. It keeps read and unread state synchronized with Google, displays your primary Google Calendar and Google Contacts, and can create an event or contact only when you explicitly choose that action and grant its separate permission.
Northstar Mail
Local-first by designProvider content is processed on your PC, not in a TreeByte mail cloud.
No TreeByte mail cloudYour provider content is not routed through a TreeByte mail server.
No ads or data salesYour mail, calendar, and contacts are not used for advertising.
One focused workspace
The information you need, without the noise.
Northstar is being built around the daily essentials: a visual message reader, dependable local search, and quick access to the schedule and people connected to your account.
Your calendar at a glance
View events from your primary Google calendar. A separate permission lets you create a new event when you choose Create event; Northstar does not edit or delete existing events or send invitations.
People when you need them
Browse contacts from your Google account. A separate permission lets you create one contact when you choose New contact; Northstar does not edit or delete existing provider contacts.
A direct connection
Local-first is more than a label.
Northstar connects from your Windows PC to Google's APIs. TreeByte does not receive a copy of your mailbox, calendar, contacts, or OAuth tokens on a Northstar cloud service.
Provider data remains local
Message, calendar, and contact content is loaded and processed by the desktop app on your PC. There is no TreeByte cross-device mailbox sync.
OAuth tokens are Windows-protected
Google sign-in tokens are encrypted with Windows Data Protection API protection tied to your Windows user before they are stored locally.
Provider access is removable
Remove an account from Northstar to clear its local account record, protected credentials, and loaded app data. Revoke Northstar separately in your Google Account to withdraw the provider grant.
Plain-language privacy
Know what every permission does.
Our privacy policy identifies each Google permission, the feature that uses it, how local data is protected, and how to remove access.