OSHI vs Bridgefy — Offline Bluetooth Messengers, Compared

OSHI is a free, open-source, end-to-end encrypted messenger for iOS and Android that uses Bluetooth and Wi-Fi mesh networking to send messages without Internet or cellular service. OSHI is an alternative to Bridgefy, Briar, Meshtastic and bitchat for offline communication, and to Signal for private messaging.

Bridgefy is the offline messenger most people have heard of. It went viral during the 2019 Hong Kong protests, it is installed on millions of phones, and it has a simple pitch: Bluetooth messages that hop from phone to phone when the Internet is down. This page compares Bridgefy with OSHI feature by feature, using Bridgefy's own site and public research as sources, and says plainly where each app is the better choice.

Feature comparison: OSHI vs Bridgefy

Sources: bridgefy.me/app (range, first-launch Internet requirement, Signal Protocol, Broadcast mode), Bridgefy release notes (anonymous mode), Wikipedia and the 2022 Albrecht/Eikenberg/Paterson paper (encryption history), OSHI App Store listing v1.0.39, oshi-messenger.com/features/mesh-networking and github.com/Lastoneparis/OSHI. "Not verified" means we could not confirm it from Bridgefy's documentation.

Where Bridgefy genuinely wins

Reach. Bridgefy claims more than twelve million users and has been on both app stores for years. In a crowd, the odds that a stranger's phone is running Bridgefy are higher than for any other offline messenger, and multi-hop relaying only works when there are relays. That is a real advantage that no feature table captures.

Google Play. Bridgefy is a one-tap install on Android. OSHI's Android build is a direct APK download from this site, which means enabling installation from your browser — fine for a prepared group, awkward for a stranger you meet at a protest.

Broadcast mode. Bridgefy has a public Broadcast section that reaches every Bridgefy user nearby without adding them first. OSHI's "Nearby" view shows peers over the mesh, but it does not have an equivalent open shout channel.

Where OSHI is different

No Internet, ever — including the first launch. Bridgefy's own instructions say you need Internet access the very first time you open the app, and so does the person you want to reach. OSHI generates its identity keypair on the device; nothing is registered anywhere, so a phone that installed OSHI from an APK passed over AirDrop or a USB stick can start meshing immediately. OSHI does not require a phone number, email address, or account.

Wi-Fi as well as Bluetooth. OSHI discovers peers over Bluetooth Low Energy and moves larger payloads over Wi-Fi Direct, so photos, voice notes and small files travel over the mesh. Bridgefy's public material describes Bluetooth only.

Encryption you can read. Bridgefy adopted the Signal Protocol in October 2020 after researchers showed the app had been unencrypted; a follow-up paper in 2022 reported that the new implementation still had weaknesses. Bridgefy is closed source, so the only way to check is to reverse-engineer it. OSHI's Double Ratchet, X3DH and mesh routing code is published on GitHub under the MIT licence — with the honest caveat that the app shell around it is not, and that OSHI has not yet had a public third-party audit either.

Offline maps and on-device AI. When the Internet is down you usually need a map as much as a chat. OSHI bundles downloadable OpenStreetMap regions with offline search and routing, and its AI assistant (translation, rewriting, Q&A) runs on the phone. Bridgefy is a messenger only.

Calls and groups. OSHI includes encrypted voice and video calls and group chats. We could not verify group or call support in Bridgefy's documentation, so the table says so rather than guessing.

Range and hops, in plain numbers

Both apps use Bluetooth Low Energy, so their single-hop range is similar: Bridgefy quotes 100 m / 330 ft, OSHI's App Store listing says "roughly 100 m apart in the open and much less through walls". The difference is what happens beyond that. OSHI relays across up to five intermediate phones using store-and-forward, so a message can wait on a relay and continue when the next phone comes into range. Bridgefy also hops across other users' phones; its maximum hop count is not published. In both cases, every phone in the chain must have the app open (or at least running) — there is no magic, only other people.

Who each app suits

Choose Bridgefy if you want the offline messenger with the largest existing install base, one-tap Google Play installation, and a public broadcast channel, and you accept a closed-source app.

Choose OSHI if you need messaging that works with no Internet at any point, want photos and files over the mesh, want open cryptographic code, or want offline maps and on-device AI in the same app. OSHI is free with no premium tier.

Frequently asked questions