📘 1000 Side Hustle Ideas Home ← Digital Products & Online Courses ← Mobile Apps & Simple Tools
HUSTLE #391 4.10 Mobile Apps & Simple Tools

Daily Gratitude and Mood Tracking Journal App

💰 Startup Cost $0
⏰ Time/wk 10-15 hrs
📊 Difficulty ★★★☆☆
🏆 1st Month $ $100-$400
💵 Monthly Range $400-$2,000
⏱ First $ In 1-2 months
Apple App Store, Google Play, Gumroad (APK)
Build a simple gratitude journal app with daily prompts, mood tracking with emoji selection, photo attachment for gratitude moments, streak counters, and a monthly mood trend chart. Mental wellness apps are a top-grossing category, and a focused gratitude app is simpler to build than a full meditation suite. Offer a free version with 3 entries and a one-time $4.99 unlock for unlimited journaling instead of a subscription that users resist.
🚀 First Step
Create a new Flutter project, build the home screen with a 'Today I am grateful for...' text input, an emoji mood selector, and a save button that stores entries in local SQLite storage with timestamps.
  • Use Flutter for cross-platform development — one codebase deploys to both iOS and Android, cutting development and maintenance time in half
  • Include a daily notification reminder that users can set to their preferred time — the #1 reason people stop using gratitude apps is simply forgetting, and reminders increase retention by 40%+
  • Add a 'Review Your Past Entries' feature with a random entry generator — seeing old gratitude notes resurface is emotionally powerful and creates the habit loop that drives word-of-mouth
🛠 Tools & Resources: Flutter, Android Studio, Xcode, SQLite, RevenueCat (in-app purchases)