Build vs. buy
Should your agency buy its software, or build it?
An honest comparison of off-the-shelf products (SaaS and COTS) and custom software built around your work. Off-the-shelf has long looked like the safer, lower-cost choice. Counted over the life of a system it rarely was, and AI-accelerated development has made custom software much less expensive and far faster to change — though building isn’t the answer for everything.
What changed
Off-the-shelf looked like the safe bet. Now the question is speed.
- What the rules require
- Software built for you
- Off-the-shelf release cycle
- Workarounds and spreadsheets
Commercial software earned its reputation as the safe choice: a known product, a predictable first-year price, and the cost shared with thousands of other customers. Next to that, a custom build looked like the bigger bet. Counted over the life of the system, it seldom was.
The price of that sharing is the roadmap. Your change request waits in line behind every other customer’s. Anything the product doesn’t do goes into a configuration layer, a consultant’s statement of work, or a customization that breaks at the next upgrade. And the subscription renews whether the product has kept up or not.
Meanwhile the rules move faster than they used to: new reporting requirements every legislative session, funding conditions that change mid-year, accessibility mandates with hard deadlines. Software that needs a release cycle to absorb a change leaves staff working around it in spreadsheets.
AI-accelerated development has made custom software much less expensive to build, and faster still to change. A senior engineer who knows your domain, working with current AI tools, can often ship the new field, workflow, report, or integration in days, on your schedule rather than a vendor’s release calendar.
That changes the build-or-buy question. It is no longer only “what will each option cost?” It is “can we afford to wait for someone else to change it?”
Side by side
Off-the-shelf vs. built for you
Where the two approaches differ once the software is in production — which is most of its life.
| Question | Off-the-shelf (SaaS / COTS) | Built with Meserow |
|---|---|---|
| Who sets the roadmap | The vendor, balancing every customer it has. | You do. |
| When a new requirement lands | A feature request, a wait for a future release, or a paid customization. | Built into your system on your timeline. Many changes need no developer at all: staff adjust the forms themselves. |
| How it fits your process | Your staff adapt to the product’s workflow. | The workflow is designed around how your staff actually work. |
| Customization | Inside the vendor’s configuration limits. Custom code is at risk at every upgrade. | It is your code, so change is the normal case, not the exception. |
| Your systems of record | Prebuilt connectors where they exist; middleware where they don’t. | Integrated to fit. PRISMnx exchanges data with King County’s Oracle EBS and PeopleSoft. |
| Your data | In the vendor’s schema; exports on the vendor’s terms. | In a database you control, in a schema your own team can read. |
| Cost over time | Per-seat subscription that grows with headcount and renewal increases. | The build, plus a maintenance plan you size. No per-seat fees. |
| If the product is sold or retired | A migration on someone else’s schedule. | You own the code, on a mainstream stack any qualified team can maintain. |
| Accessibility | Whatever the vendor ships, whenever it ships it. | WCAG 2.1 AA from the start, and fixed when you find a gap. |
Where we’d tell you to buy
Buy the commodity. Build the mission.
We don’t think every system should be custom. Plenty shouldn’t be, and we’ll say so.
Work everyone does the same way
Email, office software, payroll, the general ledger, the HR system of record, sign-in and identity. There is no advantage in doing these differently from every other organization. Buy them.
A mature product that already fits
If a product does what you need, the way you need it, and your requirements are stable, buy it and spend your budget where it makes a difference.
No one to own it after launch
Custom software needs a long-term owner: an in-house team, a partner on retainer, or both. If no one will own it, a subscription is the more honest choice.
The systems worth building are the ones only your agency has: the program you run, the compliance you report, the workflow that sets your work apart. Those should change when your mission does.
Buy the system of record, build the layer your mission runs on, and connect the two. That is how PRISMnx works alongside King County’s Oracle EBS and PeopleSoft rather than replacing them.
Fair questions
The usual worries about custom software
“What happens when the contractor moves on?”
The right question; plenty of custom systems have been orphaned. Ours are built on a mainstream stack (.NET, Angular, SQL Server, Azure) in human-readable code that lives in your repository, documented so another team could take it over. And we tend to stay: our first client, from 1997, is still a client.
“Isn’t custom more expensive?”
No. And with AI-accelerated delivery it now costs much less than it used to: a senior team builds in far less time, and every change after launch costs less still. A subscription keeps billing — renewals, per-seat growth, and the consultants it takes to bend it to your process.
“Can AI-written code be trusted?”
Not on its own. Judgment directs; AI accelerates. Every screen and every line is reviewed and owned by a named senior engineer, client data is never used to train models, and nothing ships without sign-off.
“Isn’t a big vendor more secure?”
Security comes from controls, not company size. Role-based access, audit trails, and encryption are built in from the start, and because it is your code, your security team can inspect all of it directly.
Proof it lasts
One county system: 25 years, three generations of platform
PRISMnx began as contract and project management for one King County department. Today it runs capital construction across every division, rebuilt across three generations of platform as the technology underneath changed, without losing the data or the people who rely on it. Its form builder lets county staff create new project requests, sustainability reporting, and compliance tracking themselves, so a new requirement doesn’t wait for a redevelopment cycle.
Read the PRISMnx case study →“Their ability to innovate and adapt to evolving technology has been invaluable, ensuring that our software remains ahead of the curve.”
Up for renewal?
Bring us the renewal notice and the wish list.
If a subscription is coming up for renewal, or a product can’t keep up with a new requirement, send us the list of things you’ve been waiting on. We’ll tell you honestly whether to stay, extend what you have, or build — and what each would take.