A paramedic checks for a pulse before starting CPR. So why replace a part before testing it?

In medicine, that way of thinking is the standard. In repair, there’s no standard for how a fault gets found. Diaforik brings the way a paramedic thinks into your shop and classroom. Every tech is held to that standard, on every job. The app is what keeps it.

One proven way to find the fault. Taught before the first job, held on every job after.
A written case on every job. Every reading and what it ruled out, laid out the same clean way every time. If it comes back, the proof is there.
Quality control, built in. No vehicle leaves until every safety-critical fastener has a second check, signed by both techs and time-stamped.
Your real comeback number. Every vehicle that came back in twelve months, why, and what it cost. Read by hand, then again at six months.
Trained to think before they’re hired. Schools teach the wrench. Diaforik teaches the thinking: the part the ASE task list leaves out, where to start and in what order.

No AI. Every call is made by a person, at the vehicle, with a reading behind it. Summaries are built from what the tech recorded, never written by AI.

What it does for you

Service writersHand the tech a ticket he can work from.A free seven-chapter course for the counter.Start the course →

What’s live

One standard. Six trades.

DIΔFORIKSERVICE FLOOR · SIX TRADES

LIVE1

AUTOMOTIVE & LIGHT DIESELShops · Technicians · Schools

TESTING AND DEVELOPMENT5

HARLEY-DAVIDSON

POWERSPORTS

MARINE

HEAVY EQUIPMENT & FLEET

Automotive is live. The rest are built on the same standard and in testing and development: same app, same audit, same proof.

See it work

The real app, on a real case.

The Where to start card in the Diaforik app, suggesting Lost communication first, with its reasons. — **Where to start.**What quit, how much quit at once, and the codes point to the chain. The reasons are on the screen.

The Diaforik app showing One reading, 3 ruled out, 28 to 25 still standing. — **One reading rules out three.**Termination reads 60 ohms. Two more suspects drop with it: 28 still standing becomes 25.

The Diaforik app stopping a close: Before you close, 6 of 9 groups untouched, each asking why it was not tested. — **It won’t close on a skipped group.**Every group is tested, or there’s a reason written down. Then the case closes.

A 2012 Ram whose dash drops out. Screens from the app, as a tech sees them.

Why there’s no AI in Diaforik.

No AI. Not in the app. Not in the audit.Suspect lists come from service information and physics. Audits are read by hand.

The same case has to give the same answer twice.

A fixed chain does. Give it the same complaint and the same readings tomorrow and it says the same thing, and a person can read exactly why. A model can say something different the second time, and nobody can say why. You can’t build a standard on that.

Don’t take our word for it. Open your favorite chatbot (ChatGPT, Claude, Gemini, Grok) and describe a soft brake pedal after a caliper job. Then open a new chat and ask the same thing again. Watch the answer move: the parts it names, the order it puts them in, how sure it sounds. Now imagine that on the record with your name under it.

Why there’s no AI in Diaforik: all five reasons →

What a guess costs

The bigger ticket lost the customer.

Two invoices for the same 2003 Ford Ranger. The first shop: $1,474.53 over four days, still not fixed. My Mobile Mechanic: $120, one visit, fixed and proven. — A 2003 Ranger’s pedal went soft after the shop’s own caliper job. Four days of parts came to $1,474.53, on the customer’s bill, and it still wasn’t fixed: the calipers were on the wrong sides, bleeders pointing down. Back when I ran a mobile shop, I came out once and replaced nothing: $120. That $1,474 looks like more revenue. What you don’t see is what it cost: she never went back, and every dollar she spent on that truck for the next two years went to me, not them.

$59,376ONE SAMPLE SHOP · ONE YEAR

That’s what comebacks cost a sample shop in a year: labor and parts it never billed, and customers it never saw again. It isn’t in its books anywhere. Twelve months of your repair orders already know your number.

Find your shop’s number How we count a comeback →

Tell me about your shop

Or skip the call. Send us your shop, and we’ll call you.

Published

The rules are public. The tool is the product.

Every closed case is a practical exam: a real vehicle, every reading against spec, what was ruled out, and proof it was fixed.

The Differential MethodEight steps for finding a fault and proving it, on any machine. The Comeback StandardWhat a comeback is, what isn’t, and the six things an audit reads. The Second Set of EyesWhich checks need a second person, and what a release without one carries. The Crew StandardThe store is judged as a crew. No scorecard on a tech, ever. The Findings SummaryThe seven sections every case record carries. The Instructor StandardWhat an instructor sees, for how long, and why the app never grades. Why there’s no AIFive reasons: none of them sentiment. The forty lawsThe physics built in. The laws are public; when each fires is ours.

All free to use with attribution. Each carries a version and a date.