Mobile field app · iOS + Android

Built for the first responder who is a neighbour.

Operational, offline-first, low-bandwidth. A 12 MB install that runs on a 2019 phone in a basement, finishes a verified damage report in under ninety seconds, and never asks for your name.

Works offline 14 days12 MB installVoice-first optionPseudonymous7 languagesPWA + native wrappers

current screenHome

09:41

Iziar Oblast · You are here

Hello, neighbour.

Three official sources flagged your district overnight.

AIR-RAID ALERT · ended 3 d ago

Iziar Oblast · 1 h 26 m active window

alarm.in.ua · alarm.in.ua cross-feed

GDACS impactORANGE

Copernicus EMSACTIVE

News cluster14 src

past 72 h

Air-raid alertalarm.in.ua

3 d ago

Shelling reportednational-emergency-dispatch

4 d ago

Air-raid alertalarm.in.ua

4 d ago

Air-raid alertalarm.in.ua

6 d ago

iPhone 15 · 390 × 844 logical · scaled for demo

Native wrappers via Capacitor target iOS 16+ and Android 9+ stores. The same code runs as a PWA, installable in one tap.

Open and ground yourself.

We pull live air-raid alerts, GDACS official impact polygons, and Copernicus EMS damage maps before you do anything. Your context is already on screen.

Cold-start solved — the map is alive from second zero.RESEARCH · Problem 3.6 · empty-map cold start

phone screen · Home

Capture without thinking.

One shutter. Auto-focus on structural surfaces. If your hands are shaking, switch to voice — Whisper transcribes on-device in any of seven languages.

12 MB install · works at 2G speeds.RESEARCH · Problem 3.4 · vulnerable reporters

phone screen · Camera

We find the building, you confirm.

EXIF GPS + Overture Maps footprints (offline-cached) match your photo to a specific structure. You tap to confirm — never to type an address.

Building match in 1 tap.RESEARCH · Problem 3.1 · same building, two damage levels

phone screen · Building map

Or describe it the way you would to a friend.

No GPS? No landmark you can pin? Type what you remember — 'tall 9-storey, third from the corner with Sobornyi.' On-device language model returns 3 candidates ranked by confidence.

Free-text matching with offline LLM.RESEARCH · Problem 3.4 · vulnerable reporters

phone screen · Landmark

Grade by photo, not by terminology.

Five EMS-98 grades shown as plain cards. AI suggests the most likely match. Need a second opinion? 'Show me examples first' opens a side-scroll of reference photos so you compare visually.

Zero engineering jargon required.RESEARCH · Problem 3.4 · vulnerable reporters

phone screen · Grade

Submit, queue, sync — invisible.

Online? AES-256-GCM, Ed25519-signed, gone in 1.8 s. Offline? Reports queue locally with Workbox BackgroundSync. When connection returns, they sync sequentially without your input.

Tap the offline switch above the phone to see it work.RESEARCH · Problem 3.6 · low-connectivity zones

phone screen · Submit / Queue

Your identity stays yours.

An Ed25519 key pair lives only on your device. We never see your phone number, email, name, or face. For at-risk regions, one tap wipes the key forever.

k-anonymity threshold ≥ 5 reporters before any public map renders.RESEARCH · Problem 3.7 · privacy vs verifiable identity

phone screen · Identity

Stack

Engineering, in the open.

Boring, testable, MIT-licensed. The mobile binary is a thin shell around the PWA — same code, three stores.

iOS 16+ Android 9+

Distribution
Installable PWA — A2HS in 1 tap
No app store required for emergencies. Add-to-Home-Screen drops a real icon.
Native wrappers
Capacitor for iOS / Android stores
Same React codebase. Native camera, push, background sync surfaced through Capacitor plugins.
Storage
IndexedDB / SQLite via Dexie
Up to 250 MB per device. Encrypted volume. Queue auto-trims after 30 days.
Sync engine
Workbox BackgroundSync queue
Retries every minute while offline. Exponential back-off. Conflict-free append-only schema.
Encryption
AES-256-GCM at rest · TLS 1.3 in transit
Per-device key derived via PBKDF2 from a passphrase-less device entropy seed.
Identity
Ed25519 keypair, device-bound, no server
We never see your phone number, email, name, or face. k-anonymity threshold 5.

Footprint

Built for phones that have already been through hell.

App size

12.4MB

Stripped + tree-shaken

Cold start

380ms

Snapdragon 7 Gen 3

Battery cost

< 0.4%/h

Idle, listening for alerts

Offline duration

14days

Cached tiles + queue

Median submit

1.8s

Verified report → server

Sustained 2G

12 kbpsmin

Slowest field-tested link

Benchmarked on a Pixel 4a · Android 13 with 2G throttling enabled. The app gracefully degrades — voice mode, photo capture, and the queue all work without any network at all.