iPhone · iOS 18+
The car diagnostic app you'll actually understand
The STEER car diagnostic app is a free iPhone app (iOS 18+) that pairs with the $99 STEER Bluetooth OBD2 sensor and turns your car's onboard diagnostic data into plain English. It shows a single 0–100 SteerScore, active fault codes with severity, dashboard-light explanations, scheduled maintenance, and NHTSA recall status for your VIN. AI Mechanic chat is included free (3 messages/month) and unlimited with STEER Pro ($99/year).
SteerScore
87
All systems healthy.
Last scan 12 min ago.
The four tabs of the STEER app
Each tab answers one question — and only one — so you always know where to look.
My Car
Your car at a glance.
Today's SteerScore, any active issues with severity, recent scans, and a quick-glance battery + emissions readiness status.
Mechanic
When something seems off.
AI Mechanic, the dashboard lights library, and a manual diagnostics flow where you describe a symptom and STEER suggests likely causes.
Plan
What's coming up.
Scheduled maintenance based on your make and model, plus any active manufacturer recalls for your VIN.
Garage
The boring-but-important stuff.
Your cars, your STEER sensors, your account, your billing. Multi-vehicle is included with STEER Pro.
What's free, what's Pro
Safety-relevant information is never paywalled. Pro is for depth and ongoing protection.
Free
$0
- • SteerScore
- • Current issues with severity
- • Dashboard lights library
- • Manual diagnostics (describe a symptom)
- • 3 AI Mechanic messages / month
STEER Pro
$99
per year
- • Unlimited AI Mechanic
- • Full repair guidance per issue
- • Push notifications when issues change
- • Monthly health summary
- • Multi-vehicle support
The sensor + the app, together
The app is free to download. To read real data from your car you'll need the STEER sensor.