April 5, 2025

Mathoo App

📌 Overview

Mathoo is my first Android application, born during the 2020 lockdown. Designed to transform mental math training into a fun experience, the app quickly found its audience with over 3,000 users on the Google Play Store and an average rating of 4.6/5.

Role: Solo Mobile Developer
Technologies: Kotlin (migrated from Java), Jetpack Compose, Firebase
Results: 3,000+ active downloads

🛠️ Technical Stack & Evolution

This project served as a personal laboratory to master the modern Android ecosystem:

Technology Migration: Initially developed in Java, I completely rebuilt the app using Kotlin to leverage its modern features and safety.
Modern UI/UX: Transitioned to Jetpack Compose for the user interface, adhering to Material Design principles for intuitive navigation.
Architecture & Build: Utilized Android Jetpack for robustness and Gradle for dependency and build management.
Backend Services: Integrated Firebase for data and cloud management, paired with Google Analytics to track user behavior.

✨ Key Features

Local Multiplayer: Implemented Nearby Sharing to allow users to challenge friends nearby without an internet connection.
Duolingo-style Gamification: Developed a progression system inspired by Duolingo (streaks, levels, rewards) to boost user retention.
Advanced Statistics: Detailed dashboards to help users track their progress over time.
Fluid Animations: Integrated LottieFiles for rich vector animations that energize user interactions.
Monetization: Integrated Google Ads to support the project’s ongoing development.

🖼️ Screenshots

The screenshots below show the main user journey in Mathoo: home, learning, exercise selection, gameplay, rewards, and detailed stats.

Mathoo home screen with the daily recommendation, reward claim, and progress summary. — Home dashboard with the daily recommendation, reward claim, and progress summary.

Mathoo home screen showing the daily reward countdown and recommended exercise section. — Home dashboard with the daily reward countdown and recommended exercise section.

Mathoo mini-games page with multiplayer, speed math, 2048, and upgrade entries. — Mini-games hub with multiplayer, speed math, 2048, and upgrade entries.

Mathoo learning page with tips about math and divisibility. — Learning section with math tips and divisibility explanations.

Mathoo achievements and streak screen showing goals like collecting gems and playing many games. — Achievements screen showing progression goals such as gem collection and streak milestones.

Mathoo statistics screen showing answered questions, success rate, and detailed charts. — Statistics tab with answered questions, success rate, and detailed charts.

Mathoo exercise selection screen with question count, timing, and difficulty options. — Exercise selection screen with question count, timing, and difficulty options.

Mathoo gameplay screen showing a square root question and the numeric keyboard. — Gameplay screen showing a square root question and the numeric keyboard.

Mathoo exercise chooser with multiplication, mental calculation, and problem categories. — Exercise chooser with multiplication, mental calculation, and problem categories.

📈 Impact & Learning

This project allowed me to manage a product’s full lifecycle, from the initial idea to maintaining a real user base. I learned to iterate based on user feedback and optimize the performance of a consumer-facing application.

🔗 Links & Resources

Source Code: [View GitHub Repository]

🚀 Developed by Evanescent.