A self-hypnosis mobile app for building positive habits through personalized voice affirmations.

Positive Audio Affirmations helps users reprogram their subconscious mind through self-recorded voice affirmations. Based on psychological research showing that hearing your own voice creates stronger neural pathways than listening to others.

I designed, developed, and launched this entire application independently — from concept and UX design to Play Store publication and ongoing maintenance.

React Native 0.78    
React 19.0           
JavaScript           

Redux + Redux Persist   
React Navigation 7      
AsyncStorage           

react-native-audio-recorder-player  │  Voice recording
react-native-sound                  │  Ambient sounds mixing

Firebase Analytics      │  User behavior tracking
RevenueCat              │  Subscription management
Notifee                 │  Local push notifications
Sentry                  │  Crash reporting & monitoring
ElevenLabs API          │ (Text-to-Speech)
DeepSeek API            │  AI Generator

react-native-localize   │  Device locale detection
Custom i18n system      │  EN / ES / RU translations

┌────────────────────────────────────────────────────────────────┐
│                        PRESENTATION LAYER                      │
│  ┌──────────────┐  ┌──────────────┐  ┌──────────────┐          │
│  │  Onboarding  │  │    Tabs      │  │    Drawer    │          │
│  │    Wizard    │  │  Navigator   │  │   Navigator  │          │
│  └──────────────┘  └──────────────┘  └──────────────┘          │
│         │                 │                  │                 │
│  ┌──────┴─────────────────┴──────────────────┴──────┐          │
│  │                    SCREENS                        │         │
│  │  Listen │ Record │ Categories │ AI │ Relaxation  │          │
│  └──────────────────────────────────────────────────┘          │
├────────────────────────────────────────────────────────────────┤
│                        BUSINESS LAYER                          │
│  ┌─────────────┐  ┌─────────────┐  ┌─────────────────┐         │
│  │   Redux     │  │   Custom    │  │  Notification   │         │
│  │   Store     │  │   Hooks     │  │    Manager      │         │
│  └─────────────┘  └─────────────┘  └─────────────────┘         │
├────────────────────────────────────────────────────────────────┤
│                        SERVICE LAYER                           │
│  ┌────────┐ ┌────────┐ ┌──────────┐ ┌────────┐ ┌────────┐      │
│  │Firebase│ │Revenue │ │  Notifee │ │ Sentry │ │ Audio  │      │
│  │Analytics││  Cat   │ │          │ │        │ │ Player │      │
│  └────────┘ └────────┘ └──────────┘ └────────┘ └────────┘      │
├────────────────────────────────────────────────────────────────┤
│                        DATA LAYER                              │
│  ┌─────────────────┐  ┌─────────────────┐                      │
│  │  AsyncStorage   │  │  File System    │                      │
│  │  (Redux Persist)│  │  (Recordings)   │                      │
│  └─────────────────┘  └─────────────────┘                      │
└────────────────────────────────────────────────────────────────┘

Challenge: Handling simultaneous voice playback with ambient sounds, background audio, and interruptions (calls, notifications).

Solution:

• Implemented custom audio focus management
• Used react-native-track-player for background playback with lock screen controls
• Created audio mixing system for layering ambient sounds over affirmations

Challenge: Users need full functionality without internet connection.

Solution:

• All voice recordings stored locally in app's document directory
• Redux Persist for offline state management
• Queue system for analytics events when offline
• Zero audio data uploaded to servers (privacy-first design)

Challenge: Cross-platform subscription handling with trial limits and restore functionality.

Solution:

• RevenueCat integration for unified subscription management
• Custom paywall trigger logic based on app launches
• Automatic entitlement updates via listener pattern
• Smart reactivation notifications for churned users

Challenge: Supporting 3 languages with dynamic content and locale-specific UX.

Solution:

• Device locale detection via react-native-localize
• Centralized translation system with fallbacks
• Locale-aware notification content
• RTL-ready layout structure

Challenge: Driving engagement without being intrusive.

Solution:

• Notifee for reliable local notifications
• Motivational content rotation
• Separate reactivation campaign for non-subscribers

Challenge: Implementing expensive AI text-to-speech features while maintaining a freemium model without bankrupting the project.

Solution:

• Engineered a quota system on the frontend to strictly limit API calls (character/second limits) based on subscription tiers.

• Implemented local caching: Generated audio files are saved to the file system (react-native-fs) with a hash map. If a user requests the same phrase again, the app plays the local file instead of calling the API, saving 100% of costs on repeats.

• Fail-safe architecture: Usage limits are checked locally before any network request is initiated.

  <img src="proxy.php?url=https%3A%2F%2Fgithub.com%2Fscreenshots%2F02-categories.png" width="180" alt="Categories"/>

• Zero audio uploads — All voice recordings stay on device
• No account required — Full functionality without registration
• GDPR compliant — European privacy standards

I'm Xenia, a frontend and mobile developer based in Italy. I built this entire application from scratch — from initial concept to Play Store launch and ongoing updates.

Why I built this: With a background in Psychology, I understand how self-talk shapes our beliefs and behaviors. This app combines that knowledge with my technical skills to create a tool that genuinely helps people improve their mindset.

What makes this project special:

• 🎯 Designed, developed, and shipped 100% independently
• 🔄 Continuous updates based on user feedback
• 📈 Organic growth to 10K+ downloads
• 💰 Profitable freemium business model

This repository contains documentation and architecture overview only. The source code is proprietary as this is an active commercial product.

© 2026 Xenia Galaktionova. All rights reserved.