Hello {{first_name}}

"Build an app" used to mean hiring a developer, waiting three months, and spending money you didn't have.

That's not what building an app means anymore.

But the word still scares people. Especially if you're a sustainability professional who never needed to think about code before. So let me break down what an app actually is, in plain language.

Every app has up to five parts.

The frontend is what you see. The buttons, the questions, the results. Everything visual. This is what your user experiences.

The backend is the brain. The logic running behind the scenes when someone presses submit.

The database is the storage room. Where information gets saved permanently.

The API is the connection layer. How the different parts talk to each other.

Authentication is the key. How the app knows who you are.

Now here's the part that changes everything for us.

To hold your methodology. To show a client how you think. To give someone a real experience of your expertise

You only need one of these parts.

The frontend. One HTML file. Nothing else.

Build that first. If the tool is actually useful — if people engage with it, share it, ask you questions because of it — then you invest in the rest. Backend, database, all of it. But only once you have proof it's worth building.

Start with the frontend. See what happens.

The full walkthrough of how I built mine — zero code, one session — is in the video.