# Offline Protocol

> Offline Protocol is the software and network layer that keeps apps and devices communicating, authenticating, and coordinating when the internet is unavailable. Its current public SDK is a React Native TypeScript API over a Rust core for iOS and Android. It provides DORS multi-transport mesh routing, OfflineID identity, MLS RFC 9420 encryption, serverless Service Discovery, reliability primitives, file transfer, offline telemetry, and proof of location. The network is live across 350,000+ devices in 80+ countries. OfflinePay is in development.

## Platform and technology

- [The platform](https://www.offlineprotocol.com/platform): Transport, identity, and coordination for the disconnected edge, as three interoperable primitives on one SDK surface.
- [Mesh networking (DORS)](https://www.offlineprotocol.com/technology/mesh-networking): Peer-to-peer mesh over five transports (Bluetooth LE, WiFi Direct, internet, Reticulum, Nostr) with the Dynamic Offline Relay Switch scoring transports in real time, automatic failover, 8-hop relay, and cluster-and-bridge topology.
- [Reliability layer](https://www.offlineprotocol.com/technology/reliability): Delivery guarantees on an unreliable mesh through acknowledgment, retry with exponential backoff, deduplication, and message TTL.
- [File transfer](https://www.offlineprotocol.com/technology/file-transfer): Chunked device-to-device file transfer up to 100MB with progress and cancel, encrypted and relayed like any message, so a dropped link resends only the missing chunks.
- [Offline identity (OfflineID)](https://www.offlineprotocol.com/technology/offline-identity): Ed25519 identities verified device-to-device with zero connectivity, MLS (RFC 9420) sessions, MLS-encrypted group messaging with roles, on-chain rotation and revocation.
- [Service discovery](https://www.offlineprotocol.com/technology/service-discovery): Advertise, discover, and invoke capabilities across the mesh with no server and no DNS.
- [Offline telemetry](https://www.offlineprotocol.com/technology/telemetry): Opt-in runtime observability delivered to a local sink, push or pull, streaming metrics, transport, routing, and MLS records with identifier scrubbing on by default.
- [Proof of location](https://www.offlineprotocol.com/technology/proof-of-location): Location verification from radio adjacency rather than GPS.

## Solutions by industry

- [Robotics and autonomous systems](https://www.offlineprotocol.com/solutions/robotics): Swarm coordination that survives GPS denial and lost links.
- [AI agents and edge intelligence](https://www.offlineprotocol.com/solutions/ai-agents): Peer-to-peer agent discovery and invocation without a broker.
- [Logistics and fleets](https://www.offlineprotocol.com/solutions/logistics): Fleet communication, offline telematics, and proof of delivery in yards, ports, and dead zones.
- [Agriculture](https://www.offlineprotocol.com/solutions/agriculture): Machine and sensor connectivity across acres with no cellular coverage or SIM.
- [Industrial, energy, and maritime](https://www.offlineprotocol.com/solutions/industrial-energy): Underground mine, offshore platform, plant, and vessel coordination off-grid.
- [Humanitarian and public sector](https://www.offlineprotocol.com/solutions/public-sector): Emergency communication when cell towers are down.
- [Live events and venues](https://www.offlineprotocol.com/solutions/events): Connectivity at stadium and festival scale when cellular saturates.
- [Payments and mobile wallets](https://www.offlineprotocol.com/solutions/payments): Device-to-device transaction transport and offline identity for fintech, neobanks, and crypto. OfflinePay is in development.
- [Retail and point of sale](https://www.offlineprotocol.com/solutions/retail): Offline POS and retail coordination through internet outages.

## Compare

- [Compare overview](https://www.offlineprotocol.com/compare): Offline Protocol against Ditto, Bridgefy, Meshtastic, and goTenna.
- [Offline Protocol vs Ditto](https://www.offlineprotocol.com/compare/ditto): Offline coordination and identity layer versus an offline-first database with CRDT sync.
- [Offline Protocol vs Bridgefy](https://www.offlineprotocol.com/compare/bridgefy): MLS and Ed25519 encryption versus app-level security, and a Bridgefy alternative.
- [Offline Protocol vs Meshtastic](https://www.offlineprotocol.com/compare/meshtastic): Phone-native mesh with no hardware versus LoRa radio mesh.
- [Offline Protocol vs goTenna](https://www.offlineprotocol.com/compare/gotenna): A software SDK on the phone's own radios versus dedicated mesh radios.
- [Offline Protocol vs Berty](https://www.offlineprotocol.com/compare/berty): A commercial mesh SDK versus an open-source peer-to-peer messaging app.
- [Offline Protocol vs Briar](https://www.offlineprotocol.com/compare/briar): A cross-platform mesh SDK versus an open-source secure messenger.
- [Offline Protocol vs Amazon Sidewalk](https://www.offlineprotocol.com/compare/amazon-sidewalk): A phone-native mesh SDK versus a shared gateway network.
- [Offline Protocol vs Google Nearby Connections](https://www.offlineprotocol.com/compare/nearby-connections): A routed multi-hop mesh SDK versus an Android direct-link API.
- [Best offline mesh networking SDKs](https://www.offlineprotocol.com/compare/best-offline-mesh-networking-sdks): A side-by-side of Offline Protocol and the alternatives.

## Glossary and standards

- [Glossary](https://www.offlineprotocol.com/glossary): Definitions of offline and mesh networking terms.
- [What is offline mesh networking?](https://www.offlineprotocol.com/glossary/what-is-offline-mesh-networking)
- [Offline-first architecture](https://www.offlineprotocol.com/glossary/offline-first-architecture)
- [Bluetooth LE mesh](https://www.offlineprotocol.com/glossary/bluetooth-le-mesh)
- [WiFi Direct](https://www.offlineprotocol.com/glossary/wifi-direct)
- [Multi-hop relay](https://www.offlineprotocol.com/glossary/multi-hop-relay)
- [Store and forward](https://www.offlineprotocol.com/glossary/store-and-forward)
- [Service discovery](https://www.offlineprotocol.com/glossary/service-discovery)
- [MLS protocol (RFC 9420)](https://www.offlineprotocol.com/glossary/mls-protocol)
- [Ed25519](https://www.offlineprotocol.com/glossary/ed25519)
- [Matter and Thread](https://www.offlineprotocol.com/glossary/matter-and-thread)
- [Amazon Sidewalk](https://www.offlineprotocol.com/glossary/amazon-sidewalk)
- [BLE mesh vs Thread vs Matter](https://www.offlineprotocol.com/glossary/ble-mesh-vs-thread-vs-matter)

## Developers

- [Developers](https://www.offlineprotocol.com/developers): The offline-first SDK, a TypeScript API over a Rust core for iOS and Android.
- [Interactive sandbox](https://www.offlineprotocol.com/sandbox): A live in-browser demo of the mesh. Drag devices, cut the internet, and watch a message route peer to peer across multiple hops with automatic failover, plus a runnable SDK console.
- [Developer guides](https://www.offlineprotocol.com/guides): How-to guides for quickstart, offline messaging, service discovery, device-to-device auth, and telemetry.
- [Quickstart](https://www.offlineprotocol.com/guides/quickstart): Install the SDK, initialize, join the mesh, send a first message, and advertise, discover, and invoke a service.
- [Architecture](https://www.offlineprotocol.com/protocol): How the protocol works end to end, the three primitives in depth.
- [Integrations and ecosystem](https://www.offlineprotocol.com/integrations): Platforms, runtimes, and how it works with your existing stack.
- [Downtime cost calculator](https://www.offlineprotocol.com/tools/downtime-cost-calculator): Estimate the cost of an outage.
- [Documentation](https://www.offlineprotocol.com/docs): Technical reference and API docs.
- [Mesh SDK on npm](https://www.npmjs.com/package/@offline-protocol/mesh-sdk): The current public React Native package and installation entry point.
- [Offline Protocol Status](https://status.offlineprotocol.com/): The official Health Dashboard for live service availability, uptime, incidents, and maintenance updates.

## Company

- [Company](https://www.offlineprotocol.com/company): Offline Protocol builds the transport, identity, and coordination layer for the disconnected edge.
- [Security](https://www.offlineprotocol.com/security): MLS (RFC 9420) encryption, Ed25519 identity, serverless architecture, and coordinated disclosure.
- [Pricing](https://www.offlineprotocol.com/pricing): How pilots and licensing work.
- [Company and proof](https://www.offlineprotocol.com/company): The company, network history, investors, and independent coverage.
- [Roadmap](https://www.offlineprotocol.com/roadmap): Shipped, in development, and exploring.
- [Press and features](https://www.offlineprotocol.com/company): Independent coverage and company resources.
- [Company beliefs](https://www.offlineprotocol.com/company): What we believe and why coordination should not depend on a server or a tower.
- [Founder and investors](https://www.offlineprotocol.com/company): Who founded and backs Offline Protocol, including Portal Ventures, Draper Associates, and Galaxy.
- [Careers](https://www.offlineprotocol.com/careers): Build the offline mesh network with us.
- [The live network](https://www.offlineprotocol.com/network): The mesh across 350,000+ devices and 80+ countries.
- [Blog](https://www.offlineprotocol.com/blog): Technical and non-technical writing from the team.
- [Blog RSS feed](https://www.offlineprotocol.com/rss.xml): Subscribe to new posts.
- [Book a pilot](https://www.offlineprotocol.com/contact): Scope a 6 to 10 week pilot against your fleet, environment, and success criteria.
- [Terms of use](https://www.offlineprotocol.com/terms): The terms governing use of Offline Protocol.
- [Privacy policy](https://www.offlineprotocol.com/privacy): What data is collected, how it is used, and retention.

## Blog posts

- [Open sourcing the coordination layer for the disconnected edge](https://www.offlineprotocol.com/blog/open-sourcing-the-mesh-sdk): Offline Protocol is open sourcing the Mesh SDK, the modular Rust coordination engine behind 350,000+ devices, available under AGPL-3.0 with commercial licensing.
- [How DORS failover works](https://www.offlineprotocol.com/blog/how-dors-failover-works): How the transport layer runs BLE, WiFi Direct, and internet concurrently and moves traffic between them in under a second.
- [Store, carry, forward: delivery when the path blinks in and out](https://www.offlineprotocol.com/blog/store-carry-forward): The delay-tolerant machinery: custody transfer, message IDs and TTLs, deduplication, buffering, and reconcile-on-return.
- [Proving identity with no authority to ask](https://www.offlineprotocol.com/blog/proving-identity-with-no-authority): How devices prove who they are to each other with no certificate authority, no directory, and no live network, using Ed25519 keys, trust-on-first-use, and gossip revocation.
- [Sending a message with no server](https://www.offlineprotocol.com/blog/sending-a-message-with-no-server): The smallest useful thing on the mesh, a message that reaches its recipient with no server in the path, over an encrypted mesh.
- [Service discovery without a server](https://www.offlineprotocol.com/blog/service-discovery-without-a-server): How devices advertise, discover, and invoke capabilities with no DNS, no registry server, and no internet connection.
- [The hourly cost of being offline](https://www.offlineprotocol.com/blog/the-hourly-cost-of-being-offline): Why dollars per hour, not hours, is the right unit for downtime, and what that reframing means for offline-first.
- [Why the edge is disconnected](https://www.offlineprotocol.com/blog/why-the-edge-is-disconnected): The numbers behind offline-first: internet shutdowns, blackout losses, and the billions of people affected.
- [We built the world on a dependency nobody declared](https://www.offlineprotocol.com/blog/the-network-is-an-undeclared-dependency): A perspective on the unexamined assumption that the network is always there, and why offline-first is really the act of declaring that dependency.
- [From a messenger to a network](https://www.offlineprotocol.com/blog/from-a-messenger-to-a-network): How a messenger that works without internet grew into a mesh live on 350,000+ devices across 80+ countries.
- [Telemetry that survives the dead zone](https://www.offlineprotocol.com/blog/telemetry-that-survives-the-dead-zone): Cellular and satellite links drop in transit, at sea, underground, and at remote sites, and DORS keeps telemetry flowing off-link.