Kinzo

Kinzo is a messenger that works without the internet. Two devices on the same Wi-Fi find each other and talk directly - no account, no server in the middle, nothing uploaded anywhere. Messages travel encrypted, straight from one device to the other. Because there is no server, there is nothing in between to hold a copy. WHERE IT HELPS - At home when the internet is down but the router is still up - Workshops, warehouses, basements and boats with no signal - Classrooms and offices, passing files around without the cloud - Anywhere your connection is slow, metered, or nobody else's business MESSAGING - Text, with sent and delivered receipts - Photos and videos from your gallery, or taken in the app - Voice notes recorded in the chat, and audio files - Large files sent in chunks with a progress bar - Messages written while a device is away are queued and delivered the moment it comes back - A zoomable viewer for photos and video, with share and save FINDING EACH OTHER - Devices on the same Wi-Fi appear under Available on their own - Pair by QR code: show the code on one device, scan it with the other - Connect by IP, or scan your network, when a router blocks discovery - Give paired devices your own private names, and a profile picture for others to see SECURITY - Connections are encrypted with TLS, device to device - Every device has its own key, remembered when you pair. Only the device you paired with can reconnect; anything presenting a different key is refused - Pairing shows a six-digit code on both screens. Matching numbers mean nothing is sitting in between - Scanning a QR code checks the key before it connects PRIVACY - No account, no sign-up, no phone number, no email - We run no servers and collect nothing. There is nowhere for your messages to be uploaded to - No storage or photo permission. You pick files with Android's own picker, which hands the app only what you chose - Choose the name other devices see, so your phone's real name stays private - The background service can be switched off whenever you like GOOD TO KNOW - Both devices must be on the same Wi-Fi network. Guest networks, extenders running in router mode and routers with client isolation can stop devices finding each other - Messages are stored unencrypted on your own phone, protected by the Android app sandbox and your device encryption - Mobile data is never used for messaging PERMISSIONS - Camera: photos and video you send, and scanning QR codes - Microphone: voice notes and video recording - Notifications: new messages and pair requests - Foreground service: staying reachable while the app is closed. Optional, and switchable off in Settings