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About 21 Apps

An experiment in AI-assisted development

The Project

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.

Current Status

11 / 21 apps

We're just getting started! Here's what's been built so far:

Storage TrackerFeb 1

Track your storage boxes and their contents

House FinderFeb 2

Track Redfin house listings

Hue BlindFeb 3

Test your color perception

Reflex RushFeb 4

Test your reaction time

Bee SaverFeb 4

Keep a bee alive by feeding it nectar

Date TrackerFeb 5

Track anniversaries and special milestones

Dodgy SnailFeb 5

Dodge traffic as a snail crossing the road

Daily QuoteFeb 6

A fresh inspirational quote every day to brighten your mood

Mood BridgeFeb 7

Share your mood with your partner and stay connected

Chinese AstrologyFeb 8

Discover your Chinese zodiac fortune and yearly predictions

Habit TrackerFeb 9

Track daily habits with flexible frequencies and streaks

Read the RoomFeb 10

AI-generated social intelligence game — read workplace subtext

Outfit SMS (collab w/ Connor)TBDIn Progress

SMS-only interface for weather-based outfit recommendations

More apps coming soon...

Stay tuned for more!

Tech Stack

FrameworkNext.js 16 (App Router, Turbopack)
LanguageTypeScript 5 + React 19
RuntimeNode.js 24
BackendSupabase (PostgreSQL, Auth, Storage)
StylingTailwind CSS v4 + shadcn/ui
ValidationZod + React Hook Form
DeploymentVercel
AI AssistantClaude Code (Anthropic)

About Me

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.