Custom Software or Off-the-Shelf SaaS? A Five-Year View

By Mudabbir Hasan, Co-founder · Published 2026-09-08 · Last updated 2026-09-08

Buy off-the-shelf software for commodity work and build custom software only for what sets your business apart. If a competitor could buy the same tool and do equally well with it, do not build it. Compare five-year total cost, not year one, and count the hours lost to workarounds. Small, stable teams and unvalidated processes usually belong on SaaS first.

Why is it hard to get neutral advice on custom vs off-the-shelf?

Every guide we read is written by a custom software firm. Appex Technology, Kavara and MG Software each say sometimes the answer is to keep your SaaS, and each ends with an invitation to start a project. We sell custom software too, so weigh this article the same way. What follows keeps the logic they share and leaves out their numbers, which do not agree with each other.

Which cost claims should you not rely on?

The three guides give three different break-even points for custom software. Appex describes a hypothetical in which self-hosted open source pulls ahead by year two. Kavara's illustrative example breaks even around 18 months, and it says break-even in years two to four is not a universal rule. MG Software says the crossover comes between year three and five, and that figure is unsourced. Their build-cost ranges and maintenance percentages are also uncited. Treat every one as a vendor's illustration and use your own seat counts and your own quotes.

What do the guides agree on?

Build what differentiates and buy what is a commodity. Kavara's test: if a competitor could buy the same tool and be equally effective, it is probably not worth building.
Compare five years, not one. Year-one comparisons almost always favour off-the-shelf, because the costs that favour custom arrive later: per-seat price growth, integration work and the time people lose to workarounds.
Very small teams and unvalidated processes belong on SaaS or no-code first. Appex's advice for a pre-product business is to default to SaaS. Kavara lists small, stable teams under 25 users and temporary needs while you validate a business model as cases where off-the-shelf is right.
A simple internal tool is not worth building to replace cheap software. MG Software puts a simple internal tool at roughly 15,000 to 25,000 euros, so replacing about 5,000 euros a year of SaaS does not pay back. That is its own estimate.
All three describe a hybrid for many businesses: keep commodity SaaS, build the part that is truly yours, and integrate so data flows between them.

Where each one wins

Off-the-shelf SaaS

Commodity work any competitor could run
Very small or unvalidated processes
Small, stable teams
Temporary needs

Custom software

A workflow that differentiates you
Workarounds that cost real hours
Per-seat prices growing faster than value
An internal owner to run it

How do you run a five-year comparison?

Add up the SaaS side: seats times price times twelve times five, plus the price rises you expect. Appex's example is a 25-person team at $90 per user per month, which is $27,000 a year or $135,000 over five years before any increase. Then add the cost you do not see on the invoice: integration, training, and the hours spent on workarounds.

Add up the custom side from a real quote: the build, plus yearly maintenance (Kavara puts it at 15 to 25 percent of the build cost and MG Software at 15 to 20 percent, both without a source), plus hosting. Compare the two totals, then ask whether you would still be happy with the answer at twice your current size.

Five years, not one

SaaS = seats × price × 12 × 5 + price rises + integration, training, workarounds

Custom = build + yearly maintenance + hosting

Appex example: 25 seats × $90 × 12: $27,000 a year
Over five years, before price rises: $135,000
Maintenance (vendor claims, unsourced): 15–25% of build a year

Compare your own quotes.

Five questions to ask before you decide

Is this workflow a source of competitive advantage, or something any competitor could run on the same tool?
Does the tool force a daily workaround or a manual step that costs real hours?
Will the price per user grow faster than the value as you hire?
Do you need integrations or data ownership the vendor will not give you?
Do you have someone who can own the system after launch? MG Software's warning is that custom software needs an internal owner, and without one even a good system atrophies.

Five questions before you decide

Is this a source of advantage, or a commodity?
Does the tool force daily workarounds?
Will price per user outgrow the value?
Do you need integrations or data ownership the vendor will not give?
Can someone own the system after launch?

What does it look like when custom is the right call?

The workforce management case on our site began with spreadsheets and disconnected tools that could not keep up as the client's headcount grew, with managers lacking a single reliable source of truth. That is the pattern the guides describe: a process specific to the business, outgrowing what generic tools could hold together. The engagement is confidential, so the case page only says what the client has allowed.

See the case study: workforce management platform

What should you do next?

List the workflows that cause the most workarounds and rate each one commodity or differentiating.
Price the SaaS option over five years, including the seats you will add.
Get a quote for the custom option and a maintenance estimate, and add them up the same way.
Start with SaaS where the process is not yet stable, and replace pieces with custom modules one at a time when a bottleneck proves it is worth it.

If you want to scope a custom build before committing to it, a short technical discovery is the cheapest place to do it.

Read: Paid technical discovery, what you get and when to skip it

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