Build a Split Bill App for Your Group Trip in Auto

Planning a group trip and dreading the “who owes what” math? Instead of searching for the best apps to split group trip expenses and settling for one that almost fits, you can build your own — tailored to your people, your trip, and how you actually want to split things.

Why build your own instead of downloading one

There are plenty of travel expense splitting apps out there, and some are fine. But they’re built for everyone, which means they’re built for no one in particular. You end up with features you’ll never use and missing the one thing you actually needed — like assigning specific items to specific people, or handling a shared campsite fee that only half the group split.

With Auto, you describe what you want, snap a photo of a receipt, and it builds you a personal mini-app (a “Frame”) around your exact situation. It takes minutes, and it’s yours to tweak whenever the trip changes.

Building it in Auto

Here’s the basic flow:

Open Auto and describe the app you want — for example, “a bill splitter for my camping trip that scans receipts and divides costs between six people.”
Snap or upload a photo of a receipt. Auto reads the merchant, the itemized lines, subtotal, tax, tip, and total.
Ask for the split logic you want: evenly, or by assigning items to each person.
Refine it. Rename it, change the layout, add a monthly spend summary — whatever fits your trip.

Because you’re describing it in plain language, you can be as specific as your group is complicated.

How someone built theirs

One Auto user built exactly this, and their path is a good template. They started by asking for a Frame that extracts structured data from receipt photos — merchant, date, itemized line items, subtotal, tax, tip, and total — storing each scan as history and showing a scrollable list of past receipts sorted by date, with a summary banner for total spend that month. A clean, card-based layout, tapping any receipt to see the full breakdown.

Then they iterated. They added an easy way on each receipt’s detail page to calculate tip and split the check — either evenly or by assigning items to specific people. When the split math didn’t account for shared tax and tip, they asked Auto to fix that too. They even had it update the app’s name and description as the functionality grew, eventually landing on a straightforward name once the tool felt more like a real utility than a toy.

That’s the whole point: they didn’t pick a feature list off a shelf. They built up exactly what their group needed, one prompt at a time. “Bill Splitter” is one real Frame people have already built this way — proof the idea works.

FAQ

Do I need to know how to code? No. You describe what you want in plain language and snap photos. Auto builds the app.

Can it handle a split bill for a camping trip with an odd group? Yes. You can split evenly or assign specific items to specific people, and include tax and tip in the math.

Can I change it after the trip starts? Anytime. Just tell Auto what to add, rename, or fix, and it updates your Frame.