You're the best technician in the truck. You shouldn't also be the accountant.
CortexaOS gives plumbing and HVAC owner-operators a complete business AI — estimates, invoicing, customer follow-up, maintenance agreements, and financial intelligence — run from your phone between jobs.
You lose $500–$1,500 every month to unbilled work, unanswered follow-ups, and customers who go elsewhere because nobody called them back. That stops now.
The Real Cost of Doing It Yourself
$95–$185/hr
Your billing rate
What your time is actually worth
10 hrs
Admin hours/month
Time lost to non-billable work
$950–$1,850
Monthly opportunity cost
Revenue you could have earned instead
Recovering 10 weekly admin hours at your service rate is nearly $1,000–$1,850/month. More importantly, every follow-up that doesn't happen is a job that goes to your competitor. At $149/month, CortexaOS pays for itself in the first few hours you reclaim.
Your Tuesday right now
Every one of these is time you are not billing, not resting, not growing.
Writing an estimate by hand in your truck and hoping the customer calls back
Forgetting to invoice a job because you got pulled to an emergency call
Losing a service agreement renewal because nobody followed up at the 11-month mark
Getting a 1-star Google review because the customer said "nobody ever called me back"
Trying to figure out if you're actually making money or just busy
Missing a callback on a water heater replacement because you were under a sink
Chasing a slow-paying contractor for money you're owed from 60 days ago
With CortexaOS, your Tuesday looks different.
You do the work only you can do. Everything else runs automatically — or gets drafted in seconds when you need it.
Exactly what CortexaOS does for you
Not generic AI. Built around the specific work that's stealing your time.
Estimate Generation
Writing flat-rate or T&M estimates by hand or in your head — and customers getting competitor quotes while you're writing.
Generate a professional, itemized estimate in under 60 seconds from job type, scope, and parts. Text or email it from your phone on-site.
Invoice & Collections
Forgetting to invoice, then having to chase payment weeks later while your next job piles up.
Auto-generate invoices at job completion. Payment reminders send automatically at 7, 14, and 30 days — no calls needed.
Customer Follow-Up
Leads who called for pricing but didn't book — going cold because there's no follow-up system.
Automated follow-up sequences reach out to unconverted leads at 24 hours, 3 days, and 7 days. Most customers just needed a nudge.
Maintenance Agreement Renewals
Service agreements expiring without a renewal call — and the customer signing with someone who did reach out.
Cortexa launches renewal sequences 60 days before each agreement expires. You get the renewal without lifting a finger.
Review Management
Getting a 1-star review that tanks your Google rating because you didn't have a review request process.
Auto-request reviews after every completed job. Negative feedback flagged privately before it goes public.
Business Financial Intelligence
Not knowing if you're making money, which job types are most profitable, or what your true hourly rate is after costs.
AI CFO tracks revenue per job type, true cost per hour after parts and labor, and flags your highest-margin services.
“I was running the whole business in my head and losing jobs because I couldn't follow up fast enough. CortexaOS sends estimates and follow-ups automatically. I'm booking 30% more jobs with zero extra effort.”
Steve A. — Owner-Operator, Residential Plumbing, Ohio
Ready to get your time back?
Start free. No credit card. Your Company Brain is built in under 5 minutes.