Buying Guide
Custom Software vs. Off-the-Shelf SaaS
The default assumption should usually be SaaS — custom software is justified when your actual process doesn't fit what any existing product does.
Choose SaaS — An existing product already does what you need, or your process isn't meaningfully different from how everyone else in your space does it.
Choose Custom software — Your process is a genuine point of differentiation, or gluing together SaaS tools has become more expensive and fragile than building the real thing.
| Time to value | SaaS wins almost always — it's already built. |
| Ongoing cost model | SaaS is recurring per-seat/per-usage cost; custom software is an upfront build cost with lower marginal cost to run. |
| Fit to your actual process | Custom software wins when your process is a genuine point of differentiation, not something every company in your space does the same way. |
| Vendor lock-in and control | Custom software gives you full control and ownership; SaaS makes you dependent on that vendor's roadmap and pricing changes. |
Cost implications
SaaS is recurring per-seat/per-usage cost that scales with your team and volume. Custom software is an upfront build cost with a lower marginal cost to run — the payback period depends on your growth trajectory and how long you'll use the system.
Migration considerations
Moving off a SaaS tool later means migrating your data out of its format and rebuilding any integrations others depend on — budget for that as its own project, not a footnote.
Hidden tradeoffs
- — SaaS makes you dependent on that vendor's roadmap, pricing changes, and continued existence — real risks for a business-critical process.
- — Custom software's 'ownership' benefit only materializes if it's actually maintained — an unmaintained custom system becomes a liability, not an asset.
Common mistakes
- — Building custom software to replicate what an off-the-shelf product already does well, out of a preference for 'owning everything.'
- — Staying on a stack of glued-together SaaS tools long after integration fragility and per-seat costs have exceeded what a custom system would cost.
Decision checklist
- □Have you tried to disprove the SaaS option first, or assumed custom by default?
- □Is this process actually different from your competitors', or just done in a SaaS tool differently?
- □Who maintains the custom system after launch, and is that budgeted?
Bottom line
Try to disprove the SaaS option first. Build custom when the process genuinely differentiates you, or when gluing together SaaS tools has become more expensive than building the real thing.
FAQs
Isn't custom software always more expensive?
Upfront, usually yes. Over years of per-seat SaaS fees for a growing team, the calculation can flip — the honest answer depends on your specific volume and timeline, which is exactly what an audit or scoping call establishes rather than assuming either way.
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