Process automation vs SaaS subscriptions: when each one wins
Should you buy more software, or build a custom automation? Here's the honest framework. And the questions to ask yourself before you spend another dollar on either.
Every SMB owner faces this question every few weeks: do I buy another SaaS tool to solve this problem, or do I get something custom built?
The answer almost always defaults to “buy more SaaS” , because SaaS marketing is everywhere and custom build feels intimidating. But the math frequently goes the other way.
This article is the honest framework we use when a client asks us “should we just buy a SaaS for this?” Sometimes the answer is yes (and we’ll tell you). Sometimes a custom build is the cheaper, faster, more honest choice. Here’s how to tell which.
When SaaS wins
Buy the SaaS. Or stick with what you have. When all of these are true:
1. Your problem is exactly the SaaS’s job. Bookkeeping → QuickBooks. Email marketing → Mailchimp. POS → Toast. If the SaaS was designed for your exact use case and your business looks like the use case in their demo, it’ll work.
2. The integrations you need exist. If Mailchimp connects to your e-commerce platform, your CRM, and your booking system out of the box (or via Zapier), you’re golden.
3. You’re below the SaaS’s pricing inflection point. Every SaaS gets expensive at a certain scale. If you’re a 5-person business, you’re probably well below it.
4. You’ll actually use it. This is the killer. A great SaaS that nobody opens is worse than no SaaS.
When all four are true, buy the SaaS. We will tell you so on a sales call. We have walked clients out the door with “go buy Notion + a Calendly subscription, that’s $50/month and it solves your problem.”
When custom build wins
The flip side. Build something custom when any of these is true:
1. The integrations you need don’t exist. Toast doesn’t talk to your laundromat POS. DoorDash doesn’t talk to Yelp. Most SMB integrations sit in this gap. SaaS vendors don’t build them because the market is too fragmented.
2. The data shapes are too custom. Your business has its own version of margin rules, labor logic, scheduling quirks. A SaaS forces you to bend your business to its data model. A custom build bends the data model to your business.
3. The SaaS subscription costs exceed a one-time build. If you’d pay $200/month for a SaaS forever, that’s $7,200 over three years. A custom build at $3,000 you own forever wins on year two.
4. You’re stitching 4+ tools. The moment you need data from four or more systems to answer one question, SaaS stops being the right tool. You need a thin custom layer that talks to all of them.
5. You want to own the output. SaaS is rent. Custom build is owned. If you can’t switch off your business’ core workflow without paying a vendor forever, you don’t own it.
The hybrid case (this is most SMBs)
Most small businesses we work with end up with a hybrid stack:
- SaaS for commodity work , accounting (QuickBooks), POS (Toast), email (Klaviyo)
- Custom builds for the stitching , Toast ↔ DoorDash ↔ Stripe reconciliation, daily dashboard, review handling
The SaaS handles its own domain. The custom builds handle the integrations between domains. This is the sweet spot.
It’s also where most SMBs are confused, because no SaaS vendor will tell you “you need custom for the bridge work” , that’s not their pitch.
The five questions to ask yourself
When you’re staring at “should I buy this SaaS?”, run through these:
1. Does the SaaS connect to every tool I already use, without extra glue work? If yes → SaaS is probably right. If no → consider custom or hybrid.
2. Is the workflow I’m trying to solve a “single tool” problem or a “between tools” problem? Single tool → SaaS. Between tools → custom.
3. Will I actually use this thing in 30 days? If the answer is “I should, but maybe not” → don’t buy it. A SaaS you don’t use is worse than no SaaS.
4. Am I paying for features I’ll never use? Most SMB SaaS is priced for mid-market. Check the lowest tier carefully. If you’d be paying $200+/month for the 3 features you actually need, custom is competitive.
5. Does the SaaS lock me in? Long contracts, data lock-in, key workflows owned by the vendor → bad. Month-to-month and exportable data → fine.
Real examples from our actual conversations
Case 1. Restaurant owner asks “should I buy [popular restaurant analytics SaaS]?” We looked at the workflow. He wanted a daily revenue summary. The SaaS was $300/month, required POS integration setup, and would deliver a dashboard. We said: skip the SaaS, we’ll build you a custom daily WhatsApp pulse for a flat fee and you own it. He paid back the build in his first month from a comp pattern he’d never noticed.
Case 2. Dental practice asks “should we build a custom review tool?” We looked at their setup. They had 25 reviews/month, mostly positive, single location. We said: don’t build, use [a $40/month SaaS] , it’ll do 80% of what you need and a custom build is overkill at your volume. They went with the SaaS. Three months later, no regrets.
Case 3. Auto shop owner asks “should I buy ShopMonkey or stay with Tekmetric and add automation?” We looked at the math. ShopMonkey switch would cost them 2 weeks of disruption + ongoing $400/month. Tekmetric + our quote builder automation = one-time build + no switching cost. They stayed and added our build. Closed 35% more estimates in 90 days.
When in doubt, ask
If you’re staring at a SaaS purchase decision and not sure, that’s exactly what our 20-minute call is for. We don’t make money telling you to buy more SaaS, and we won’t make money telling you to build something you don’t need. So we have an actual incentive to give you the honest answer.
Tell us the situation. We’ll tell you what we’d do. No deck.
Have a process you want automated?
Or a senior person you need to staff. Tell us in plain English. We’ll tell you if it’s worth building, and what it costs.