Live
Diag Co-Pilot
Conversational diagnosis with follow-up questions, photo intake, and answers in plain English.
Syntropex / Practical technology
Practical systems for everyday problems.
We build focused tools that turn uncertainty into clearer, more useful next steps. One considered product at a time.
Our approach
Useful technology.
Thoughtfully connected.
- Start with a real problem
- Make complexity understandable
- Keep people in control
Live product / Syntropex Diag
Understand the problem. Choose the next step.
When your car does not feel right, start with a clearer picture. Explore what might be happening, how urgent it could be, and what to do next.
Open DiagProduct example2018 Honda Accord · P0301
Cylinder 1 misfire detected
Address soon
A misfire can affect drivability and may damage the catalytic converter if ignored.
Possible causes to investigate
- 01Ignition coil
Can prevent a cylinder from firing correctly.
- 02Spark plug
Wear or fouling can interrupt ignition.
- 03Fuel injector
A delivery problem can disrupt the air–fuel mix.
Example only — not a diagnosis of your vehicle.
One connected toolkit
Start with what you notice.
Use your words, a code, a photo, or a sound. Diag brings those observations together with your vehicle context.
No mechanical expertise or scanner is required to start.
Live
Acoustic Analyzer
Record the knock, rattle, or whine and get an analysis of what that sound usually means.
Live
OBD-II Decoder
Paste any check-engine code — get the plain-English meaning, usual causes, and severity. Free.
Live
Repair Guides
Step-by-step procedures with the context to actually follow them — from bulb swaps to brake jobs.
Live
Quote Auditor
Upload or paste a shop estimate. Line by line, see what is fair, what is inflated, and what to ask about.
Live
My Garage
Every vehicle, its health score, recalls, and diagnosis history — in one place.
Built for the real world
Useful before the toolbox comes out.
Drivers & DIY owners
Make sense of the warning light.
Turn an unfamiliar symptom into a structured conversation. Understand the possibilities, learn what questions to ask, and decide whether it is safe to keep driving.
- Describe symptoms in everyday language
- Explore possible causes without the jargon
- Prepare for a more informed repair conversation
Enthusiasts & mechanics
Start with a structured picture.
Bring diagnostic codes and hands-on observations together. Use the result as a starting point for your own inspection, not a substitute for one.
- Add the details you already know
- Review possible causes and related checks
- Keep the mechanical inspection in your hands
A clearer answer includes its limits
Guidance, not guesswork presented as certainty.
Diag provides probabilistic guidance, not a confirmed mechanical inspection.
Possible causes are starting points for investigation. A qualified technician can inspect the vehicle, verify the cause, and recommend an appropriate repair.
Your safety comes first. Stop driving and seek professional help for dangerous symptoms, including a flashing check-engine light, severe shaking, smoke, fuel smells, or loss of braking or steering control.
Read our privacy policyHow Diag works
From “something’s wrong” to a more informed next step.
- 01
Describe what you notice
Share the symptoms, sounds, or warning lights in your own words. Add vehicle details and useful context.
- 02
Understand the possibilities
Explore possible causes and related information, organized to help you make sense of the problem.
- 03
Choose a safe next step
Use the guidance to decide what to check, when to seek professional help, and what to discuss with a mechanic.
Diag / Pricing
Start free. Grow your toolkit.
Free
$0Forever
A practical place to start.
- 5 AI diagnostics a day
- 1 photo and 1 sound analysis a day
- OBD-II code decoder & Quote Auditor
- 1 saved vehicle and repair guide
DIY
$5.99/mo
For owners who do their own work.
- 100 AI diagnostics a day
- 10 photo and 20 sound analyses a day
- Up to 5 saved vehicles
- Unlimited saved repair guides
Mechanic
$18.99/mo
For enthusiasts & working mechanics.
- 500 AI diagnostics a day
- 50 photo and 100 sound analyses a day
- Unlimited saved vehicles
- Unlimited saved repair guides
Cancel anytime · No cancellation call required
The Syntropex system
One considered tool at a time.
Diag
A clearer starting point for understanding vehicle symptoms and deciding what to do next.
Explore DiagHost
A more considered approach to managing the work of hosting.
One
A focused place for the tools and information you use every day.
Market
A simpler way to discover, compare, and choose products.
Diag / FAQ
Answers, up front.
Do I need an OBD-II scanner?
No. Describe a symptom, paste a code from a scanner, or add a photo. Bluetooth live telemetry is planned for the connected-hardware release.
Does Diag replace a mechanic?
No. Diag provides guidance and possible causes, not a physical inspection or confirmed repair. Dangerous symptoms need professional help.
What can I use today?
Private Garage, Diagnostic Co-Pilot, Acoustic Analyzer, OBD-II decoding, Repair Guides, Quote Auditor, and Safety Recalls are available in the app. Commercial fleet and connected-hardware features remain in development.
Will Diag tell me to go to a shop?
Yes when hands-on inspection, special tools, or a lift are needed. The guidance helps you prepare for that conversation.
Can I cancel anytime?
Yes. Manage your subscription from the app; no cancellation phone call is required.
Start with what you notice