Why I built WRENCH
A $46.50 light bulb.
I bought a diesel truck at auction for three grand. It wouldn't start, so it got towed to a shop. By the time I pried it off the lot, I'd paid $3,119 — most of it parts, marked up two, three, four times over.
Then they handed me the "recommended" list. Another $5,400 of work. $1,471 to swap a serpentine belt and two pulleys — about $150 in parts. $630 to change the differential fluid. $218 just to diagnose a washer pump. And right there in black and white: $46.50 to replace a single brake-light bulb.
A light bulb.
I said "give me my truck back" — and I fixed every one of those items in my own driveway for a few hundred bucks in parts. I kept north of $4,600. On a $3,000 truck. With hand tools and the internet.
But I'm one guy who happens to know which end of a wrench to hold. Most people get that list, swallow hard, and pay it — because they have no way to know the $46.50 bulb is a five-minute, five-dollar job, or that the scary-sounding "flush" is just fluid they could change themselves.
That's the whole reason WRENCH exists. Snap the quote. It tells you what's actually needed, what it really costs in parts, how hard it is to do yourself, and exactly how much you keep by doing it. Not "you got ripped off." "Here's $4,600 you just kept."
Show me the receipts
The "recommended" list I declined — vs. what I paid in my driveway:
≈ $4,650 kept
by doing it myself
Yeah — I built an app for exactly this…
Then it happened again. Different shop. Different vehicle. Same playbook — a routine visit, and a $3,098 "recommended" list handed to me before I'd left the lobby.
Today's "recommended" service
≈ $2,500 saved
looks like my weekend's going to be busy
And that's just two of them. It doesn't count the $3,200 HVAC repair I did myself for $300 — or the dozens of others since I started keeping track.
The app that paid for itself —
now it's available to everyone else.
The smartest tool in your toolbox is the one that tells you when you don't need the shop at all.
— Founder, WRENCH