A used-car check before you pay the deposit
A used-car pre-purchase service in two layers, live at prepurchasepro.com. One reviewer reads the listing, photos and documents against each other and marks every seller claim; a vetted inspector then sees the car and the file closes with a Buy, Negotiate, or Walk verdict.
Visit prepurchasepro.com
The purpose
A used-car listing is a sales document. Buyers cannot tell which claims the photos and records support, which they contradict, and which nothing settles. An inspection booked blind tests nothing in particular, and the deposit is usually gone before anyone reads the paperwork.
How it works
Claims marked on paper, tested on the car, closed with a verdict
The buyer sends the listing. A reviewer marks each claim and writes the brief. An inspector tests the claims on the car and closes the file with a verdict.
Explore an example route
Example route: a record conflict becomes the first thing the inspector checks.
Arrow keys step through the route. Home returns to the full process. Follow keeps the current step in view.
-
Buyer Step 1: Send the listing Email, photos, records
- Hands off
- Listing and documents to step 2, Mark each claim
-
Reviewer Step 2: Mark each claim Three marks, each cited
Supported, Inconsistency found, or Not established. Every mark cites the document or photo behind it.
- Receives
- Listing and documents from step 1
- Hands off
- Marked claims to step 3, Write the brief
-
Reviewer Step 3: Write the brief Within two business days
- Receives
- Marked claims from step 2
- Hands off
- Brief to step 4, See the carBrief to step 6, Decide
-
Inspector Step 4: See the car Test drive, lift, paint depth
The inspector reads the brief before the visit.
- Receives
- Brief from step 3
- Hands off
- Findings to step 5, Close the file
-
Inspector Step 5: Close the file Buy, Negotiate, or Walk
- Receives
- Findings from step 4
- Hands off
- Verdict to step 6, Decide
-
Also from step 3 · Brief Buyer Step 6: Decide File and verdict in hand
- Receives
- Brief from step 3Verdict from step 5
- Ends here
- One possible ending of the process.
- One example route. All alternatives stay visible.
Read the process and handoffs
- Send the listing
Buyer · Email, photos, records.
- Listing and documents: Mark each claim.
- Mark each claim
Reviewer · Three marks, each cited. Supported, Inconsistency found, or Not established. Every mark cites the document or photo behind it.
- Marked claims: Write the brief.
- Write the brief
Reviewer · Within two business days.
- Brief: See the car.
- Brief: Decide.
- See the car
Inspector · Test drive, lift, paint depth. The inspector reads the brief before the visit.
- Findings: Close the file.
- Close the file
Inspector · Buy, Negotiate, or Walk.
- Verdict: Decide.
- Decide
Buyer · File and verdict in hand.
My part
I designed the evidence model and the two-layer service, wrote the copy, and built the page through three critique rounds: an expert usability review, a design and copy director pass, and a mobile redline measured against written acceptance checks.
In practice
Live and taking listings by email. Reviews and inspections are booked by hand while the operations layer is built.
The example file is constructed and says so on the page. A record conflict is a reason to ask, not a finding about the car. Only the inspector's visit produces the verdict.
Want to know more?
This one is public. The source stays private, but the product is live and you can try it. Get in touch if you would like to discuss how it was built.
Ask about this project