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Audra

The personal safety app that works when your screen is locked and your hands are full

2025–2026
iOS App DevelopmentFirebase BackendCloud Infrastructure
Audra — Personal safety app for women — one gesture, five simultaneous SOS streams

Overview

Audra is a native iOS personal safety app for women. One gesture triggers a simultaneous emergency response: loud siren, continuous audio recording, real-time GPS tracking, SMS to emergency contacts with a live location link, and optional auto-call to police — all running in the background with the screen locked. Responders receive a live web page with a real-time map and a freshness badge.

O Desafio

Existing safety apps fail at the moment they matter most — they require a screen tap, a passcode, a moment of calm. Audra was built for the opposite: phone in a pocket, one hand free, under stress. Every feature had to work silently in the background with the screen locked. Apple's background execution budget is narrow; a data race in an audio session kills the alarm silently. Getting Apple's Critical Alerts entitlement — which bypasses Do Not Disturb on responder devices — required a manual approval process with strict criteria.
Audra — the challenge we set out to solve

A Solução

10 Independent SOS Trigger Paths (button, widget, voice, volume combo, Apple Watch, fall detection)5 Simultaneous Evidence Streams (audio, video, screenshot, GPS trail, network forensics)AES-GCM On-Device Encryption via CryptoKit — Firebase never holds plaintextReal-Time Responder Web Page with Live GPS Map and Freshness BadgeAWS SNS SMS — 113-char single message across GB/ES/FR/DEApple Critical Alerts Entitlement — bypasses Do Not Disturb on responder deviceswatchOS Companion + WidgetKit Lock Screen Widget24-Country Emergency Number Auto-Dial Database
Audra solution detail — view 1 of 4Audra solution detail — view 2 of 4Audra solution detail — view 3 of 4Audra solution detail — view 4 of 4

Every architectural decision was made under one constraint: it must work when someone's life depends on it. 10 trigger paths. 5 evidence streams. One gesture.

Resultados

10

Independent SOS trigger paths — no single point of failure

5

Simultaneous evidence streams per SOS event

24

Countries with auto-dial emergency number

10

Locales supported at launch

Desempenho

Online & mantidoFora do escopo
Audra — final product showcase

Créditos

Serviços Entregues

  • iOS App Development
  • Firebase Backend Architecture
  • Cloud Infrastructure
  • App Store Submission Pipeline

Tecnologias

  • Swift 6
  • SwiftUI
  • watchOS
  • WidgetKit
  • AVFoundation
  • SFSpeechRecognizer
  • CryptoKit
  • CoreLocation
  • Firebase (Auth, Firestore, RTDB, Storage)
  • Cloud Functions (TypeScript)
  • AWS SNS
  • StoreKit 2
  • Fastlane
  • Leaflet.js

Equipe

  • iOS & watchOS Engineer
  • Backend & Cloud Architect
  • UX Designer
  • App Store Submission Lead
  • QA & Safety Testing

Desenvolvido por

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