Custom software or SaaS? Buy a SaaS (software by subscription) when the function is common: accounting, email, CRM. Build custom software only when that process is how you make money and no tool covers it without workarounds. For many businesses the right answer is to combine both.
Here are 7 questions to decide, how to compare cost without fooling yourself and what to check if you operate in Colombia.
Custom software or SaaS: what is the main rule?
Ask yourself whether the process is an engine or a pipe. A pipe is something every business needs and works the same for everyone: invoicing, sending emails, keeping contacts. The engine is what sets you apart: how you quote, how you deliver, how you serve customers. Buy the pipes and build the engine, and only if you need to.
Two industry guides agree.
Wavect, a company that sells custom development, opens its guide by saying most companies should not build custom software, and it justifies building when the workflow is your competitive advantage (Wavect). Develop Argentina says the same: SaaS for a standard function and custom development when the process defines how you sell, deliver or quote (Develop Argentina).
Which 7 questions should you answer?
- Does your competition do this the same way you do? If yes, it is a pipe: look for a SaaS.
- Does the process already work by hand? Automating a process that is still unclear locks its mistakes into code.
- How many workarounds would you need? If you already have spreadsheets and manual steps around the tool, the "glue" can cost more than either clean option.
- How does the cost grow? A SaaS charges per user, and that bill grows with your team and does not end.
- What has to connect? Electronic invoicing, payments, WhatsApp, your store. If the tool does not integrate, you will have manual work.
- Who will own the code and the data? In custom development, an unclear contract leaves you dependent on the vendor. Get in writing that the code and the accounts are yours.
- Who will maintain it? Custom software needs an annual budget for updates, security patches and small changes.
If most answers point to common processes, choose SaaS. If questions 1 to 3 point to your own validated process, consider building.
How do you compare the real cost of each option?
Do not compare the first-year price. Compare total cost over a fixed horizon, the same for both options. The guides do not agree on the period: Wavect recommends three to five years and Develop Argentina, 12 to 24 months. Pick one and use it for both.
| Item | SaaS | Custom |
|---|---|---|
| Recurring payment | Per-user licenses, today and as you grow | Hosting, support and improvements |
| At the start | Implementation and your team's time | Discovery, design and phased development |
| Integrations | Sometimes charged separately | Built to your needs |
| Manual work left | What the tool does not cover | Almost none, if the scope was well defined |
| Risk | Depending on the vendor and its limits | Depending on whoever maintains it |
Fill this table with real figures from your quotes. Without your own numbers, any comparison is an opinion.
What should you check in Colombia?
Electronic invoicing. Businesses required to invoice electronically can do it three ways: through a technology provider authorized by the tax authority (DIAN), with the DIAN's free service or with their own development, according to the Colombian Institute of Public Accountants. Before choosing, confirm which mode applies to you and, if you use a provider, that it is authorized: the DIAN can cancel that authorization.
Customer data. If the software stores personal data, Colombia's Law 1581 of 2012 requires the data subject's authorization. Ask where the data is stored and who is responsible for it. This is not legal advice: consult a lawyer about your case.
When does it make sense to combine both?
Almost whenever you have one unique part and several common ones. At Mokev we built our digital cards platform custom, because it is the product we offer. In contrast, we use ready-made services for payments (Mercado Pago), email (Resend) and hosting (Vercel). We build what sets us apart and buy what everyone needs.
What mistakes keep repeating?
- Building before validating the process by hand.
- Comparing only the launch price.
- Not putting in writing who owns the code, the data and the accounts.
- Not budgeting for maintenance.
- Accepting a tool without testing it on your real workflow: try the two or three closest ones with a true case before deciding.
If you are unsure, start with a short discovery phase: define the scope and a closed budget before committing. If you want help deciding, see our work on custom software and consulting, or write to us with your case.
Frequently asked questions
Is custom software more expensive than SaaS?
At the start it usually is, because you invest in design and development before using it. Over several years the math changes if you pay per-user licenses for many people. That is why you should compare total cost, not the first year.
Can I start with a SaaS and build later?
Yes. It is a prudent way to validate the process. Before starting, confirm that you can export your data so you do not get trapped.
What happens if my SaaS vendor disappears or raises prices?
You depend on them. That is why it matters to export your data regularly and review plan-change terms before signing.
What is a discovery phase?
A short piece of work before building: the full workflow is written down, existing tools are tested and the scope is defined. It gives you a closed budget instead of an open one.
How much does custom software cost?
It depends on the scope, and there is no single price. Ask for a phased proposal with clear deliverables and check who ends up owning the code and the data.
