Tesseract Companion

Tesseract Companion is the browser half of the Tesseract desktop app. If you use the desktop app, the extension can also open its assistant in a side panel; if you do not, the password manager works on its own and nothing about it depends on the desktop app being installed. Tesseract Companion keeps your passwords and two-factor codes in an encrypted vault. Your vault is encrypted on your device before it ever leaves it, and the server stores ciphertext. Set a master password and it becomes zero-knowledge in the strict sense: the key is derived from a password we never receive, so nobody at Tesseract can decrypt your vault — not by choice, but by construction. Without a master password, your key is kept for you so that a new device can unlock itself automatically. That is the trade: convenience, or a vault nobody but you can open. The extension tells you which one you are in, and you can set a master password at any time. • Autofill — offered on the site you are actually on, filled when you click, never silently in the background. • Authenticator — your TOTP codes sit beside the login they belong to, so there is no second app to reach for. • Generator — strong passwords or memorable passphrases, generated on your device and never transmitted. • Offline first — the vault is local. An account is entirely optional and is only ever used to sync the encrypted vault between your devices. • Free, synchronized, on every device. Sponsored messages: if your Tesseract account has no balance or paid plan, the side panel occasionally shows a sponsored message under an answer, clearly labelled “Sponsored”. It is never chosen from the pages you visit or from your conversations — the extension sends nothing from them to any ad network.