Why Build an App That Already Exists?

There's a psychological phenomenon called the IKEA Effect. We tend to value something more when we helped create it ourselves.

When I taught 5th grade, I enjoyed designing my own classroom materials, like worksheets, posters, and games. My classroom was full of resources I had created. Looking back, I don't think my materials were necessarily better than what someone else could have made. But they were mine.

The same was true of lessons. If I had a hand in creating the lesson, I taught it better. I knew why each part was there. I was more invested. More excited. More willing to tweak it until it worked.

The same thing happens with vibe coding.

Teacher Hive is full of apps you can use right away. If you need a timer, randomizer, spinner, or hundreds of other tools, someone has likely already built one, ready for you to use immediately.

So if everything you need already exists, why bother building anything yourself?

Whether you're creating your own version of an existing tool or bringing a completely original idea to life, you're far more likely to value and appreciate something you helped build.

Building an app can be fun, frustrating, and incredibly satisfying. When AI doesn't quite understand your prompt, you revise it. When something breaks, you figure it out. When it finally works, it feels like an accomplishment because you pushed through the struggle.

Then comes the best part: using it.

One app I've built is The Reverse Card. It's a goofy brain break with a colorful card game theme. Players draw a random word or phrase, try to say it backwards, and then the app reverses the recording so everyone can hear how close they came. The results are equal parts creepy and hilarious. Teachers can even enter their own words or phrases, making it work with any subject.

Could I have found an existing app to play recordings backwards? Yes.

AI helped me build The Reverse Card, but the concept, the gameplay, and the little details are mine. Every time I use it with students, I get a little extra satisfaction because I remember everything that went into creating it.

There's a moment during my workshops that never gets old. I'll use one of my own apps without mentioning that I made it. After everyone has used it for a while, I'll casually reveal that I built it.

There's usually a pause.

Then someone says, "Wait... you made this?" The app stops being just a tool and becomes something they can imagine creating themselves.

I've seen that same shift happen with participants in my vibe coding workshops. They finish an app and just stare at it for a while, almost like they don't quite believe it.

Not because it's completely unique. But because it's theirs.

This sense of ownership also motivates me to keep improving my apps. If I think of a small tweak or a big new feature, I can paste the code into an AI chat and keep building. The app evolves as my ideas evolve.

Developing your own app is more than creating a utility. It's a craft. You're combining your ideas, your classroom expertise, your knowledge of pedagogy, and your creativity with AI's coding ability to bring something to life.

Whether your idea is brand new or your own take on an existing one, you'll probably value it more because you helped build it.

That's the IKEA Effect.