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50% faster drive cycles
Intelligent monitoring tracks all OBD-II readiness monitors and guides optimal driving patterns to complete emissions testing cycles twice as fast.
Diagonal
See what you’ll save on drive cycles
Find out exactly how much time and money Diagonal can save your shop every month — then download and get rolling.
ROI tool
Drive cycle savings calculator
See exactly how much time and money you’ll save each month.
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Drive Cycles
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Time & Labor
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Results
Average number of drive cycles needed for emissions testing
Diagonal improves first-attempt success to 95%+
How long a typical drive cycle takes your shop
What you typically charge per hour of labor
Your monthly savings
$0
with Diagonal
Weekly Savings
$0
Hours Saved / Mo
0 hrs
Pass Rate Lift
0%
Let’s get you started
Download the app and start saving time and money on drive cycles today.
Ask your rep about an extended free trial.
Download & Sign UpWhy shops choose Diagonal
Built for the bay, not the boardroom
Faster cycles, fewer retests, and live status where techs already look — the Lock Screen.
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95%+ first-try pass rate
Proven algorithms help shops pass emissions testing on first attempt, eliminating costly repeat cycles and customer frustration.
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Live Activity tracking
Real-time progress monitoring on iPhone Lock Screen keeps your technicians informed without opening the app.
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AI that speaks plain language
Codes and next steps explained for apprentices and driveway diagnosticians — not just the lead tech with twenty years in.
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Cloud sync across devices
All diagnostic data syncs automatically, so every technician has access to complete vehicle history.
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Professional-grade tools
Mode 6 data, freeze frame analysis, and comprehensive OBD-II readings with professional accuracy at consumer pricing.
New
AI Mechanic, dialed in for the learning curve
Whether you’re new to the bay or fixing it yourself on a Saturday, Diagonal’s AI now explains what’s wrong — and what to do next — without the shop-manual fog.
Try it in the app- Trouble codes translated into clear, actionable language
- Guidance that meets you where you are — apprentice or DIY
- Still sharp enough for experienced techs who want a second set of eyes
Proven in shops
Results that show up on the invoice
50%
Less time per drive cycle
$1.2K+
Average monthly savings
95%+
First-attempt pass rate
1000+
Vehicle models supported