Sound tells the story
Hear the knock.Know the next move.
WrenchEar listens through your phone mic and turns an engine sound into a cautious first check — so you can decide what to do before it gets worse.
Record first. Create a free account when you want your result.
Reference sample
The source describes rod knock for this reference clip, and that does not identify a failed component in another vehicle.
Preview only — not your vehicle.
What we heard
A repeating, low mechanical knock is audible while the passenger-car engine is revved through the complete source recording.
What it might be
Connecting-rod bearing / rod-knock pattern. The source creator describes a bad car engine with rod knock. That supports the label for this reference clip, but it does not identify a failed component in another vehicle.
What not to do
Do not rev or drive a vehicle making a deep knock to reproduce the sound. Arrange professional inspection or roadside help instead.
Next check
Keep the vehicle parked and arrange a qualified professional inspection or roadside recovery.
Reference example
Advisory only — not a diagnosis. $4.99 each on Free and Unlimited; included with Super.
Heard
A repeating low mechanical knock in the documented passenger-car reference clip.
Might be
The source describes rod knock; similar sounds can have other causes.
Limits
A recording cannot identify a failed component or establish another vehicle’s condition.
Safety
Do not rev a deep knock. Shut down safely and arrange inspection or roadside help.
Next check
Share the clip and vehicle context with a qualified professional for vehicle-specific inspection.
Share link
The share link includes the audio.
Anyone with that URL can open the report and copied audio.
How it works
A first listen that stays honest.
The parked-vehicle flow keeps the recording, source, comparison, and uncertainty together. It helps organize a next check; it does not declare a diagnosis.
Record or upload first
Park and keep the phone steady. Record a 15-second target or upload an existing clip, with car or motorcycle context alongside it.
Read what the sound supports
See audible observations, possible causes, evidence limits, and safety guidance kept in separate plain-English sections.
Choose the next safe move
Keep the vehicle parked, make a safe visual check, or share a mechanic-ready report when a qualified inspection is next.
Sound index
Start with the pattern you recognize.
Browse a matching guide, then use the parked recording flow when you need to keep your own evidence with the next step.
Plain pricing
Start free. Pay only for the room you need.
See full plans on the pricing page.
Free
First saved analysis
One saved analysis free, including the recording, vehicle context, cautious result, and next steps.
WrenchEar Unlimited
$0.99/month
Unlimited analyses and subscriber sound library access. Mechanic-ready reports are $4.99 each. Cancel anytime.
WrenchEar Super
$4.99/month
Unlimited analyses, subscriber sound library, and unlimited mechanic-ready reports. Cancel anytime.
Reports: $4.99 each for Free and Unlimited; included without a separate purchase for Super.
Audio: stored with the analysis; a spectrogram may be sent for interpretation.
Sharing: anyone holding a mechanic-report share URL can access the report and copied audio.
Safety first
A sound check should never talk you into a risky drive.
Park and stay still.
Record only while parked and stationary. Keep the phone away from hot or moving parts, and never handle it while driving.
Escalate serious sounds.
Do not rev a deep knock. If the sound may be serious, stop driving when safe and arrange qualified inspection or roadside help.
Straight answers
Before you record
Is this a diagnosis?
No. WrenchEar provides an advisory first check. Possible causes are not confirmed faults, and a recording does not replace inspection by a qualified mechanic.
Does it work on cars and motorcycles?
Yes. The analysis flow asks for either car or motorcycle context before you submit a recording.
What happens to my audio?
WrenchEar stores the submitted audio with the analysis. A spectrogram may be sent for interpretation. A mechanic-report share URL exposes the report and copied audio to anyone holding that URL, so recordings are not described as private.
When should I stop driving?
If the sound may be serious, stop driving when safe and arrange inspection or roadside help. Do not rev a deep knock just to make a better recording.
Ready when parked
Start with the sound you have.
Create an account, record 15 seconds, and get one saved first check free. Questions about the workflow? We can help.