Secure cookie sync for your own browsers

Keep browser sessions in sync without giving up control

StayLogged moves encrypted cookie data between Chrome, Firefox, and Edge through a clean sync pipeline. One login, the same session state, and a protected core that stays yours.

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Open source
End-to-end encrypted
Domain-level control
Encrypted coreBrowser sessionsVerified sync
ChromeFirefoxEdgeEncrypted session transportSelective sync rulesBackup and restore

Product walkthrough

Browser session sync, explained like a product instead of a protocol paper

StayLogged is still a security tool, but the product story should be easy to scan. Each part below shows what you get, why it matters, and how the interface makes it usable.

Real-time session sync

Sync your browser sessions as they change

StayLogged keeps your signed-in state aligned across Chrome, Firefox, Edge, and other Chromium-based browsers. When cookies change in one browser, encrypted updates move to your connected browsers so you can stay logged in without repeating the same sign-in flow.

Push encrypted session changes with a live sync pipeline.

Keep desktop browsers aligned around the same account state.

Make cross-browser switching feel like one continuous session.

Session overview

github.com

Signed in on 4 browsers

Live sync

Chrome

Updated

Firefox

Updated

Edge

Updated

iPhone
amazon.com
notion.so
stripe.com

Security-first design

Keep sessions synced without exposing them

Your cookie data is encrypted before it leaves your device, so StayLogged cannot read the sessions you sync. Built with OPAQUE and VOPRF, the system is designed for private session transfer without tracking, analytics, or data resale.

End-to-end encryption protects data before upload.

OPAQUE and VOPRF keep the trust model tight.

No tracking and no analytics built into the sync flow.

StayLogged extension

EncryptionEnabled

OPAQUE

Account login stays private.

VOPRF

Session data stays unreadable to us.

Transport view

Encrypted only

Browser

session_cookie -> encrypted_blob

WebSocket

Cloud

stored as ciphertext only

No tracking
No analytics
No resale

Selective control and backup

Choose what to sync and restore it when you need it

Control exactly which domains are included with whitelist or blacklist rules, then keep encrypted backups available for recovery on a new browser or device. You decide what enters sync, what stays local, and when a saved session should be restored.

Use domain rules to keep sensitive sites out of sync.

Save encrypted backups for device changes or recovery.

Restore session state without rebuilding everything by hand.

Sync rules

Whitelist mode

github.com

Sync enabled

notion.so

Sync enabled

bank.example

Excluded

Encrypted backups

3 snapshots

Today, 09:41

Chrome + Firefox

Yesterday, 22:18

Edge + Chrome

Mar 29, 17:06

New device restore

Restore the latest encrypted session snapshot on a new browser in a few clicks.

How it works

From one login to every browser you use

1

Install the extension

Add StayLogged to the browsers where you want the same signed-in state.

2

Choose your sync rules

Pick the domains you want included, and keep the rest local.

3

Stay signed in across browsers

Session updates move through encrypted sync so switching browsers feels continuous.

Stay logged in across the browsers you already use

Install StayLogged to sync encrypted browser sessions, keep domain control in your hands, and restore your state when you move to a new device.

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Frequently asked questions

Answers to the questions people ask before trusting session sync.

What is browser session sync?

Session sync keeps your login sessions synchronized across different browsers. When you log into a website in one browser, StayLogged securely syncs that session to your other browsers so you stay logged in everywhere without re-entering credentials.

Is StayLogged safe and secure?

Yes. StayLogged is a privacy-first secure sync product with end-to-end encrypted cookie payloads. The browser extension client is open source and auditable, and decryption keys stay on your devices rather than on our servers.

How does cross-browser login work?

StayLogged securely stores encrypted cookie data in the cloud. When you enable sync between browsers, it syncs these encrypted cookies via WebSocket. Each browser can decrypt only its own data, and only you hold the decryption keys.

Why is the server not open source?

The client is open source because that is the part users need to audit for privacy, encryption, and local key handling. The server remains closed to keep the service commercially sustainable, reduce copycat private-host abuse, and protect operational routing and anti-abuse logic. That does not give the server access to your plaintext cookie payloads, because those are encrypted before upload.

What browsers are supported?

StayLogged supports Google Chrome, Mozilla Firefox, Microsoft Edge, and other Chromium-based browsers.

Does this violate website terms of service?

StayLogged is designed for legitimate personal use, syncing your own login sessions across your own browsers. Always use it responsibly and only on accounts you own.

Guides for sessions, cookies, and secure sync

Learn how StayLogged works, how browser sessions move between devices, and how to set up sync with a smaller trusted scope first.