Evidence-first vehicle diagnostics
Is your check engine light a $20 leak or an $800 catalyst repair? See what the car actually reported and the next cheapest telling test.
Available now on the App Store. A compatible customer-supplied adapter is required to read the vehicle. Core use supports Device Only and Save Nothing.
OfflineConnect a compatible adapter, capture the standardized evidence, and leave with a clear next step.
Your first read-only scan can capture codes, context, readiness, and supported signals.
Bluetooth LE, supported Wi-Fi, and approved native companion paths.
One illustrative P0171 capture shows the difference between receiving a code and choosing the next useful test.
Elevated short-term and long-term fuel trim support testing for a vacuum or intake leak before condemning the catalytic converter or replacing a sensor.
7B8F 2A11 C09E 44D3Illustrative demo data. No vehicle was connected for this example.
The evidence stays technical. The path changes based on what you need to decide.
My light is on
See the evidence, the uncertainty, and the least expensive telling test before anyone starts replacing parts.
Follow the driver pathI am buying a car
Challenge the vehicle, review readiness and fault memory, and keep a VIN-reduced decision record.
Follow the buyer pathI run a shop or fleet
Capture before-and-after evidence, retain unchanged outcomes, and keep the technical record ready for the next person.
Follow the shop path Ask a fleet questionA calm, direct workflow keeps hardware truth, vehicle evidence, and the next decision in the right order.
Measure the exact adapter, transport, and available command surface before describing coverage.
P0171+18.7%731 RPMRecord the returned codes, freeze frame, live context, readiness, and evidence gaps.
Get a conservative test order and a privacy-reduced report with an integrity fingerprint.
Prices are U.S. catalog references. Verified in-app storefront controls availability, localized pricing, tax, purchase, and restoration.
The essential evidence workflow without an account or card.
The complete owner and buyer intelligence workflow.
100 vehicles, unlimited scans, 10,000 sessions, technician handoffs, and Fleet Drift.
Review ShopPermanent Core access. Recurring Academy, deep Buyer Intel, and continuing services remain separate.
Review Founders termsThe Mac and Linux releases are free today. Paid desktop unlocks remain unavailable until cross-device restoration passes its release gates.
Generic, enhanced, full-system, read-only, and state-changing capabilities are separate. A familiar adapter name never promotes itself into a broader claim.
Open the exact compatibility workflowA model name is a candidate. The exact unit earns the claim.
Search a model to preview the capability questions ScanWrench will verify at connection.
Checked against current official consumer product pages on July 22, 2026. An X means the reviewed workflow does not provide the specifically named feature, not that the company lacks every adjacent capability.
| Workflow | ScanWrench | FIXD | BlueDriver | Carly |
|---|---|---|---|---|
| Evidence fingerprint | Yes. SHA-256 evidence fingerprint | No. No named fingerprint workflow | No. No named fingerprint workflow | No. No named fingerprint workflow |
| Exact-MPN parts research | Yes. Catalog-first MPN workflow | No. Repair guidance, not this workflow | No. Repair Reports, not this workflow | No. Repair guidance, not this workflow |
| Fresh buyer evidence workflow | Yes. Buyer Challenge | No. Vehicle history is a different product | No. No named buyer challenge | Yes. Used Car Check |
| Customer-supplied adapter candidates | Yes. Exact unit preflight | No. FIXD Sensor required | No. BlueDriver sensor required | No. Carly scanner required for most features |
The limits stay visible because the evidence has to hold up.
No. ScanWrench uses compatible customer-supplied adapter candidates and checks the exact unit at connection. A model name is a candidate, not a guarantee.
No. Generic OBD, manufacturer-enhanced data, full-system access, read-only functions, and state-changing functions are separate capability levels. ScanWrench reports only the level supported by the exact configuration.
No. ScanWrench preserves observed evidence and offers cited hypotheses plus the next safest test. A code alone does not prove which part failed.
Yes. Choose Device Only to retain data on your device or Save Nothing to erase the session. An account is optional for supported cloud features.
ScanWrench Desktop 0.5.1 is available for Apple silicon Mac. Version 0.6.0 is available for Linux x64 and Linux ARM64. Windows remains unavailable until its exact Authenticode-signed installer passes the release gates.
No. The verified in-app storefront controls availability, localized pricing, tax, purchase, and restoration. Free remains available without a website checkout.
Download the public iPhone app from Apple. Signed Mac and Linux desktop releases remain available, and Windows stays behind its exact Authenticode release gates.
Install the public release from Apple and let the verified storefront manage updates and purchases.
Get ScanWrench for iPhoneAvailable on the App StorePublic release, updates, and purchases are managed by Apple.Apple silicon Mac is notarized and stapled. Linux x64 and ARM64 packages include exact detached signatures.
View desktop releasesRelease record and requirements