All buildsReal build · 17 October 2026
A budget app, built from one sentence
A limit for each category and what is left of it this month, written in Swift by Borel and opened in the iPhone simulator.
The prompt“A monthly budget: a limit per category, add what I spend, and see how much is left in each category this month.”
- Cost
- 5.6 credits$0.56
- Time
- 5 min 12 sprompt to running app
- Code
- 24 filesnative Swift
What the app does
- Each category has a monthly limit; the top card shows what is left to spend, what is spent and the whole budget.
- Bars change colour at 85% of a limit and again once it is reached, and the card says when you are over.
- Add an expense with an amount, category, note and date, and see what it leaves in that category before you save.
- Spending lists the month's expenses by day, with a search, and both tabs step back through earlier months.
- A category shows how much you can still spend a day for the rest of the month.
- Amounts use the currency of the iPhone's region, and everything stays on the iPhone.
Keep it just for you
Make the version you want and put it on your own iPhone’s home screen with Borel Companion, then change it whenever you like. Keep up to 3 apps on your iPhone with a free Apple ID; Companion renews them for you.
Apps for yourself
To publish it, you bring
Your content
Your own categories and limits. It opens with five example categories and three expenses; make them yours before you publish.
Your Apple account
Publish to the App Store with Borel Pro and your own Apple Developer account, so the app is listed under your name.
Build yours
Start from this prompt and change it to fit your idea. Nothing is built until you send it.
Start with this promptNew to Borel? See how it works, how to make iPhone apps on Windows and what credits cost.