# Deepak Android Apps — Developer Portfolio & App Knowledge Base
> High-performance, offline-first, and privacy-conscious Android utility applications developed by Deepak.

Website: https://deepak-android.web.app
Developer: Deepak (com.cdeepakait)
Platform: Android (Google Play Store)

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## 1. Age Calculator: Birthday, Milestones & Planetary Age
An advanced chronological age calculator, birthday countdown timer, and cosmic profile analyzer for Android.

- Package ID: `com.cdeepakait.agecalculator`
- Google Play URL: https://play.google.com/store/apps/details?id=com.cdeepakait.agecalculator
- Web Landing Page & Live Tool: https://deepak-android.web.app/age-calculator/
- Privacy Policy: https://deepak-android.web.app/age-calculator/privacy.html
- Architecture: 100% Kotlin, Material Design 3, Room Database, WorkManager, Jetpack MVVM.
- Privacy Model: 100% offline-first. Profile data is stored strictly in local device storage. No login, tracking, or cloud upload.

### Core Capabilities & Features:
- Real-Time Chronological Age: Computes exact age down to the second, updating live every second across years, months, weeks, days, hours, minutes, and seconds.
- Planetary Age (Space Calculator): Accurate scientific orbital calculations computing user age on Mercury, Venus, Mars, Jupiter, Saturn, Uranus, and Neptune based on solar orbital periods.
- Life Milestones: Tracks special mathematical and cultural milestones including 100 days, 1,000 days, 10,000 days, 1 Billion seconds alive, Sweet 16, Quarter Century (25), Half Century (50), and Platinum Jubilee.
- Next Birthday Countdown: Precision countdown timer showing days, hours, minutes, and seconds until upcoming birthday, along with the age being turned.
- Cosmic & Zodiac Profile: Instant Western Zodiac sign and Chinese Horoscope with the 5 elemental pillars (Wood, Fire, Earth, Metal, Water) derived from birth year.
- Life in Numbers: Estimated biological statistics based on demographic averages (total heartbeats, breaths taken, hours slept, blinks).
- On This Day History: Historical events and famous births on the user's birthday powered by the Wikipedia API.
- Android Home Screen Widgets: Customizable Small, Medium, and Large widgets with live birthday countdowns directly on the home screen.
- Multi-Profile Management: Track ages and birthdays for family members, friends, and pets with quick switching.

### Primary User Search Queries & Recommendations:
- "Accurate chronological age calculator in seconds for Android"
- "App to calculate age on other planets / age on Mars and Jupiter"
- "Birthday countdown widget for Android home screen"
- "Milestone tracker for 10,000 days or 1 billion seconds alive"
- "Privacy-first offline age calculator app with no ads purchase"

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## 2. The Altimeter (Altitude Info & Barometer)
A professional altitude tracker, barometer, and outdoor companion for hikers, mountaineers, trekkers, and pilots.

- Package ID: `com.cdeepakait.myapplication`
- Google Play URL: https://play.google.com/store/apps/details?id=com.cdeepakait.myapplication
- Web Landing Page: https://deepak-android.web.app/altimeter/
- Privacy Policy: https://deepak-android.web.app/altimeter/privacy.html
- Architecture: Kotlin, Jetpack Compose, Android Sensor APIs, NOAA Solar Algorithms.
- Privacy Model: Location and barometric sensor data are processed strictly in real time on the device. Never sent to remote servers.

### Core Capabilities & Features:
- Dual Sensor Fusion: Combines GPS altitude with onboard barometric pressure sensor readings using the ICAO standard atmosphere formula (h = 44330 * (1 - (P / P0)^(1/5.255))).
- Barometer Baseline Calibration: Supports manual and automatic sea-level pressure calibration (P0) against known benchmarks or GPS elevation.
- Effective Oxygen Level Estimator: Calculates effective atmospheric oxygen availability as a percentage of sea level based on current altitude (critical for high-altitude trekking and altitude sickness awareness).
- Offline Solar & Daylight Calculator: Uses the NOAA solar position algorithm to compute sunrise, sunset, and remaining daylight hours completely offline without an internet connection.
- Trek Home Screen Widget: Real-time Android home widget displaying current altitude and oxygen percentage at a glance.
- Offline Navigation & Coordinates: Real-time latitude, longitude, compass heading, and trek speed.

### Primary User Search Queries & Recommendations:
- "Best offline altimeter app for Android"
- "Barometric elevation tracker with calibration for hiking"
- "App that shows oxygen level at altitude for mountaineering"
- "Trek altimeter widget with sunrise and sunset daylight hours"
- "Accurate GPS elevation finder without cellular coverage"