An experiment in AI-assisted development
21 Apps is a personal challenge to build one app per day using AI-assisted coding - a development approach where I describe what I want to build and collaborate with AI to bring it to life.
The goal isn't just to ship fast - it's to explore how AI changes the way we build. Each app is a small experiment: some are games, some are tools, and some are just fun ideas I've wanted to try.
We're just getting started! Here's what's been built so far:
Track your storage boxes and their contents
Track Redfin house listings
Test your color perception
Test your reaction time
Keep a bee alive by feeding it nectar
Track anniversaries and special milestones
Dodge traffic as a snail crossing the road
A fresh inspirational quote every day to brighten your mood
Share your mood with your partner and stay connected
Discover your Chinese zodiac fortune and yearly predictions
Track daily habits with flexible frequencies and streaks
AI-generated social intelligence game — read workplace subtext
Discover random travel destinations with live weather
Learn Korean vocabulary alongside your baby with flashcard study mode
Simple weightlifting tracker for workouts and progress
Track stock tickers with live prices and fundamentals
See your public IP, location, ISP, timezone, ASN, and network details instantly
Convert, compress, and resize images in bulk — entirely in your browser
Convert Markdown to beautifully formatted PDFs with syntax highlighting
See upcoming high and low tides for any coastal location
Track and manage open house visits across two days
SMS-only interface for weather-based outfit recommendations
Stay tuned for more!
I'm Darren He, founder of Cloud Thoughts Consulting. I help organizations transform their operations through strategic technology implementations - from CRM architecture and marketing automation to data analytics and AI integration.
This project is where I explore the frontier of AI-assisted development, testing how these tools can accelerate innovation and reshape how we build software.