NulBridge

MysticByte Studios

About this app

No ID. No Trace. Just Connection.

NulBridge connects two people directly — phone to phone, or phone to browser — for private chat, file transfer and voice & video calls. Everything is end-to-end encrypted with keys made on your device for one session. There is no account, no phone number, and nothing is stored on a server.

HOW IT WORKS
• Create a private link and send it through any channel you trust — or read out a 6-digit code.
• The other person opens the link in the NulBridge app or in any current browser at nulbridge.pages.dev. Nothing to install for them.
• Your devices connect directly, peer to peer. Compare the safety code shown on both screens to rule out interception, then chat, send files or start a call.

PRIVATE BY DESIGN
• End-to-end encryption: AES-256-GCM with per-session ECDH P-256 keys (HKDF-SHA-256).
• The secret part of a private link never reaches any server.
• Messages live in memory only. Received files stay in the app's private storage until the session ends, unless you save or share them.
• A signaling server only introduces the two devices; it never sees messages, files or keys.
• No analytics, no ads, no trackers.

FEATURES
• Encrypted chat with typing indicators and delivery receipts
• File transfer up to 500 MB per file, streamed in encrypted chunks
• Voice and video calls
• Safety codes to verify that nobody sits in the middle
• Scan a link's QR code, or paste it
• Connection check to see whether your network allows direct connections
• Light and dark themes, on phones and tablets

GOOD TO KNOW
• Peer-to-peer means the other person can see your IP address, unless the connection is relayed.
• Some strict corporate or mobile networks block direct connections.
• A session ends when either of you leaves it or closes the app.

Free. No account. Nothing stored.