How I Replaced $35,000/Year in SaaS With AI-Built Software

Most small business owners treat software like a utility bill. You pay it, you complain about it, and you assume there's no alternative.

I used to think the same way. Until I added up what we were spending.

The Number That Made Me Angry

When I sat down in late 2024 and actually tallied our software stack, the number was $35,000 per year. Not in employees. Not in rent. In software subscriptions.

ERP system. CRM. Inventory management. Shipping platform. B2B portal. Each one solving one piece of the puzzle. None of them talking to each other properly. All of them requiring workarounds, manual data entry, and someone on our team spending hours bridging gaps that the software vendors didn't care about.

The worst part? None of these tools were built for an auto parts distributor. They were built for generic "businesses." We were forcing our workflows into their boxes.

What Changed

I'd been watching AI development closely since 2023. When I started seeing what was possible with tools like Claude and GPT-4 — not just chatting, but actually building — something clicked.

What if we just built our own?

Not the old-school way, where you'd hire a development team for $500K and wait two years. The new way: an AI coding assistant, a developer who understands our business, and a clear spec of what we actually need.

We started in early 2025. Within six months we had a working ERP that does everything the $35K stack did — plus things none of those tools could do.

What We Built

Our ERP handles:

• Order management — from quote to fulfillment, with automated routing logic that decides the cheapest/fastest way to ship each order based on our warehouse locations and vendor relationships
• Inventory — real-time across three locations, with automatic reorder suggestions based on velocity data
• Customer management — full CRM with lifecycle tracking (lead → prospect → customer → at-risk), B2B portal for wholesale accounts, and AR invoicing
• Purchasing — vendor POs, dropship automation, container tracking for our overseas tire imports
• Shipping — integrated with Canpar, Purolator, GLS, and our freight carriers. Rate shopping happens automatically.
• Analytics — Amazon BSR tracking, competitor pricing intelligence, margin analysis by SKU

The thing that would have cost us $35,000 a year in subscriptions — and still wouldn't have done half of this — now costs us the salary of one developer working part-time.

The Real Cost of Generic Software

Here's what most business owners don't think about: the cost of software isn't just the subscription fee.

It's the time your team spends working around limitations. It's the bad decisions made because the reports don't show you what you actually need to see. It's the integrations that break. The data that lives in five different places.

When I calculated the true cost of our old stack — subscription fees plus labor to manage it — we were probably closer to $80,000 a year. Maybe more.

What I'd Tell Other Business Owners

You don't need to build everything from scratch. Most businesses don't have the complexity to justify it.

But if you're spending serious money on software that doesn't fit your business, it's worth asking: could we build something better?

The barrier to custom software has dropped dramatically. AI coding tools can build production-grade applications faster than anyone thought possible two years ago. A developer who would have taken six months to build our ERP from scratch built it in three — because they had AI as a pair programmer.

The tools that used to be reserved for enterprise companies with seven-figure IT budgets are now accessible to a $10M auto parts distributor in Winchester, Ontario.

Where We Are Now

Our ERP is in production and handles every order we process. It's not perfect — we're constantly improving it — but it's ours. It fits our business. When we need it to do something new, we build it. We don't submit a support ticket and wait six months for a feature request.

The $35,000 we used to spend on SaaS? A fraction of that now goes toward the developer who helps us keep building. The rest stays in the business.

That feels like the right trade.

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Brian Barber is the Founder & CEO of Autrex, a Canadian auto parts distributor based in Winchester, Ontario. He writes about building a business in public at brianbarber.ca.