Linkage SDK enables mobile phones to communicate with each other without central infrastructure, Wi-Fi, or internet. Build resilient applications for the future.
Three revolutionary principles work together to ensure free and secure communication
Mesh Networking
Phones communicate directly with each other via Bluetooth and Wi-Fi Direct. If the recipient is further away, the message travels "hand to hand" through other devices.
CRDT Synchronization
A special mathematical algorithm guarantees that when two phones meet, data is automatically and conflict-free synchronized.
E2E Encryption
Messages are encrypted on the sender's phone. Relay devices only forward but cannot access the content.
The cornerstone of digital sovereignty and resilience
Works even when cell towers fail, networks are overloaded, or there's no coverage.
Data stays 100% on endpoints. No central server, no data collection.
Anyone can audit, modify, and integrate it into their own application. Transparent, community-owned.
Use just the mesh layer or full encrypted sync - you decide.
Intelligent algorithms minimize battery drain: <6% extra consumption over 24 hours.
Every new user strengthens the network. You're investing in community security.
Linkage creates connections where traditional technology fails
During floods, earthquakes, or power outages, mobile networks fail. With Linkage, rescue teams and victims can communicate even when cell towers are down.
50,000 people in one place? Base stations get overloaded. With Linkage, groups find each other and organizers send safety messages.
Private community platform for residents. Voting, shared costs, messages - without Big Tech platforms collecting your data.
Researchers working in remote areas (forests, fields) automatically sync data when they meet - no satellite phone needed.
Open-source SDKs that any Flutter developer can integrate into their project
Low-level network layer. Handles Bluetooth LE and Wi-Fi Direct, neighbor discovery, and direct data transfer.
flutter pub add linkage_transport
Data synchronization engine with CRDT algorithms. Automatic, conflict-free data merging between devices.
flutter pub add linkage_sync_crdt
Security layer. Decentralized identifiers (DID) and end-to-end encryption (E2EE) without central server.
flutter pub add linkage_identity_vault
Technical KPIs that prove system reliability
Get in touch with us and learn how to integrate Linkage SDK into your project.