My own app, 2026, in testing

Centline

A phone app for truck drivers who own their one truck: every load as one record, from saved to paid. I design it and build it, on my own.

What Centline is

It is for a driver who owns his one truck and runs it as his own business, often in his first year, reading his phone one-handed at a loading dock at night. Centline keeps each load in one place, from the day it is saved to the day it is paid: where it stands, its paperwork, and the invoice that goes out with that paperwork attached.

It is in testing and not yet in the App Store, so no one uses it for real yet.

Why I built it

My dad has driven a truck for 32 years, and he owns his own. Driving is only half of that job; the other half is paperwork, and the money waits on it. I built Centline for that half: the stretch between delivering a load and getting paid for it.

5,888tests passing
144pull requests merged since 29 July 2026
13screen sizes measured: 8 phones, 5 tablet windows
28design specs, written before the code

What I did

Every product decision, including cutting a whole half of the app when it turned out to be the wrong half.
The design system. Every colour comes from one set of tokens, checked for WCAG contrast, with a night palette for a loading dock at 2am.
Rules held by tests, not by memory. Every screen fits every phone from 280 to 440 points wide, and nothing ever grades a driver’s record.
Options before code. Each change is drawn two to four ways, picked, written down, then built and walked on my own phone. Claude Code is in the loop: it draws the options I choose between and checks the work against my rules.

Try it: one button for the moment

The app opens on the load he is on, drawn as a green highway sign, with one button that matches where the load is:

Where is the load? Booked Rolling Delivered

BookedRollingDelivered, Tuesday

Laredo, TX to Memphis, TN

$2,850, load 48213

The one button: Picked upDeliveredWrite the invoice

Drawn in HTML and CSS, in Centline’s colours. The load is made up.

The call I would make again

Centline began as a tool for pricing loads. Six weeks in, I cut the entire cost side, because the real pain is getting from delivered to paid. What is left does two jobs well instead of five jobs halfway: move the load, and get it paid.

Four phones in sequence: an email from Example Logistics with a rate confirmation shared to Centline, picking the invoice it belongs to, signing the rate confirmation on the phone, and invoice 1042 with the signed bill of lading and the rate confirmation ticked in the packet. — From your inbox to the invoice, in four steps. A design preview: names and numbers are made up.

Four phone screens titled Getting paid, labelled A to D. A shows three small cells: Not sent, Not due yet and Late. B is one card with a row per pile. C puts the late money first in a dark card. D turns the piles into filter chips. — The top of Getting paid, drawn four ways, with A marked as the pick. Names and numbers are made up.