hereherehere

A way to find each other in crowded places when cell service and wifi are down.

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hereherehere.app

Post where you'll be and until when. Your phone carries it through the crowd over bluetooth mesh, like a message in a bottle. Only friends you've added can read it. No cell, wifi, or GPS needed.

How it works

1. When service disappears — hereherehere lets you share where you'll be when cell service and wifi are down. It uses nearby phones to carry your messages through a crowd, like a message in a bottle.
2. Privacy first — your messages are encrypted so only friends you've added can see them. Other phones may help carry them, but they can't read them.
3. Open to broadcast — phones can only pass messages while the app is open. During your event, we'll remind everyone around the same time to open hereherehere for a quick crowd refresh.

Monorepo layout

apps/
  mobile/   Expo (SDK 54) + React Native app — the product
  web/      Static site for hereherehere.app — landing + /friend redirect

npm workspaces; one lockfile at the root.

Getting started

Node 24 (via nvm). From the repo root:

npm install            # installs both workspaces

npm run mobile         # start the Expo dev server (scan with Expo Go)
npm run web            # start the static site dev server (Vite)
npm run web:build      # build the static site to apps/web/dist

apps/mobile

The React Native app. Crypto is pure JS, and the mesh sits behind a swappable Transport interface: native builds (dev client / EAS) use real dual-role BLE (central + peripheral over GATT), while Expo Go falls back to a simulated mesh — both drive the same anti-entropy sync protocol, so product code never changes. See apps/mobile/README.md for architecture and the security model.

apps/web

A zero-framework-ish static site (Vite, multipage):

• / — landing page.
• /how — how it works.
• /friend — friend-link target. Decodes the friend payload from the URL fragment (so it never reaches the host), shows who's adding you, then deep-links into the app or points to install instructions.

Deployed to hereherehere.app (Cloudflare Pages).

Privacy

No account, no phone number, no backend, no GPS. Private keys live only on-device. Only friends you add can read your messages; other phones can only carry them.

Support

This software is entirely free to use. Please consider supporting it.