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AudraDie Sicherheits-App, die auch bei gesperrtem Bildschirm funktioniert

Von Kenneth Melchor, Gründer & Technischer Direktor

2026
iOS App DevelopmentFirebase BackendCloud Infrastructure
SwiftSwiftUIwatchOSFirebaseAWS SNSApp Store
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Diese Fallstudie behandelt Audra – eine native iOS-Sicherheits-App für Frauen. Eine Geste löst eine simultane Notfallreaktion aus: Sirene, kontinuierliche Audioaufnahme, GPS-Tracking in Echtzeit, SMS an Notfallkontakte mit Live-Standortlink und optionaler automatischer Notruf – alles im Hintergrund bei gesperrtem Bildschirm.


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

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 — 10 Independent SOS Trigger Paths (button, widget, voice, volume combo, Apple Watch, fall detection)Audra — 5 Simultaneous Evidence Streams (audio, video, screenshot, GPS trail, network forensics)Audra — AES-GCM On-Device Encryption via CryptoKit — Firebase never holds plaintextAudra — Real-Time Responder Web Page with Live GPS Map and Freshness Badge

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.


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


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Alle Kennzahlen unabhängig überprüfbar. Letzte Prüfung: Juni 2026.


Erbringte Leistungen

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

Technologien

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

Team

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

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