You ask three vendors to quote the same application. One says three months, another says seven, and the third won't give a timeline until they do "discovery." The most expensive quote is almost triple the cheapest. Odds are none of them is wrong. Each vendor understood something different from what you asked for, so each one priced a different application.
How much does custom application development cost? The short answer is "it depends," and you can't build a budget on that. A market rate pulled from somewhere doesn't help either, because no single rate fits every project. What we can do is show you what the cost of custom software depends on, how it's usually billed, and what you can do so the number you approve looks like the number you end up paying.
Why two quotes can be so far apart
An early quote is an estimate made with little information. Steve McConnell describes this with the "cone of uncertainty": an estimate made at the initial concept stage can be off by up to four times on the high or the low side. The range narrows as requirements and design get defined.
That explains a lot of the gap between vendors. One assumed the integration with your ERP was a simple query; another assumed an API had to be built from scratch. One quoted the web version only; another added the mobile app, security testing and deployment. Before you compare amounts, compare assumptions. If a proposal doesn't spell them out, ask for them in writing.
What drives the cost
The price is hours of work times the rate for each hour, plus infrastructure and licenses. Hours go up or down with these factors:
| Factor | What makes it more expensive | What makes it cheaper |
|---|---|---|
| Scope | Many user types, workflows full of exceptions, custom reports | A first version focused on one process |
| Integrations | Systems without APIs, legacy ERPs, data duplicated across systems | Systems with documented APIs and clean data |
| Platforms | Web, iOS and Android built separately | One platform or a cross-platform app |
| Security and data | Personal or sensitive data, many roles, audit requirements | Internal data with no personal information |
| User experience | Design from scratch and testing with users | Standard components |
| Team and timeline | Highly specialized profiles or compressed deadlines | A reasonable timeline and a stable team |
| Data migration | Cleaning and loading years of history | Starting with fresh data |
Integrations are the factor people underestimate most. Connecting a new application to an old system can cost more than the application itself, especially when that system exposes no services and someone has to build the bridge.
Security comes right after. If the system will handle national ID numbers, health data or customer information, it needs access control, activity logging and data protection by design, and all of that turns into design and testing hours. On top of that, Chile's Law 21.719 on personal data protection is still set to take effect on December 1, 2026. There's a bill to push it back a year, and the Senate Constitution Committee approved the idea of legislating it in October 2026, but until it's published as law, the date stands. An application you start building today will run for years under the law. Compliance belongs in the quote, not in a "phase two."
Fixed price or time and materials
The billing model decides who carries the risk of a bad estimate, so pick it based on the project rather than habit.
With a fixed price, you agree on a closed scope and an amount. You get budget certainty, but the vendor adds a margin to cover what it doesn't know, and every change goes through a scope negotiation. It works when the requirement is clear and unlikely to change.
With time and materials, you pay for the hours actually worked, usually with a cap or an estimate per phase. It's more flexible and often cheaper when the project will learn as it goes. In exchange, you have to take part in prioritization and review progress often.
Many projects combine the two: a fixed-price discovery phase that delivers scope, architecture and a tighter estimate, followed by development in sprints with a budget agreed per phase.
| Fixed price | Time and materials | |
|---|---|---|
| Certainty of the amount | High, if scope doesn't change | Medium, controlled per phase |
| Flexibility for changes | Low | High |
| Who absorbs estimation error | The vendor, priced into the margin | Shared |
| How involved you are | At kickoff and at acceptance | Throughout the project |
The cost that isn't in the quote
Building the application is the first invoice, not the last. Then come infrastructure, third-party licenses, support and improvements. Academic research puts maintenance at between 60% and 90% of the total lifecycle cost of an application. The exact figure depends on how you measure it, but the takeaway holds: what you pay to build is usually the smaller part.
To avoid surprises, ask the proposal to include:
- The estimated monthly infrastructure cost at the expected usage. If the application will run on Azure, you can work it out with the Azure pricing calculator before anyone writes a line of code.
- The third-party licenses and services the system needs, and which of them are billed monthly.
- What support looks like after delivery: a bank of hours, a monthly fee or billing per request.
- A reference budget for first-year improvements. As soon as people start using the application, change requests show up.
How to lower the cost without lowering quality
Cutting tests or documentation makes the quote cheaper and everything after it more expensive. There are better ways to protect the budget:
- Start with a narrow first version. Solving one process well beats covering five halfway, and what you learn from real users is worth more than any specification.
- Invest in discovery, the phase that does the most to shrink estimation uncertainty. In Software design and development: stages and deliverables we list what you should receive when it closes.
- Check whether everything needs to be code. Approval workflows or internal forms can sometimes be handled with Power Apps or Power Automate, leaving custom development for the parts that truly need it.
- Clean up your data before integrating. Every inconsistency between systems ends up as development hours.
- Secure ownership of the code. If you switch vendors and the repository isn't yours, you pay twice. This and other points are covered in Software factory in Chile: 10 questions before signing.
Frequently asked questions
How much does custom software development cost in Chile?
There's no single figure. It depends on scope, integrations, platforms and the level of security you need. A serious estimate comes after discovery, not after a half-hour meeting.
Which is better, fixed price or time and materials?
Fixed price if the scope is clear and won't change. Time and materials if you expect to adjust along the way. A fixed-price discovery followed by phased development usually balances the two.
How much should I set aside to maintain the application?
More than most people expect. Treat infrastructure, licenses, support and improvements as annual costs, and ask the proposal to estimate them from the start.
Ask for an estimate with the assumptions in plain sight
A good quote says what it assumed, what it includes and what it leaves out. At Disrupsoft we build custom web and mobile applications that integrate with the systems you already use, and we stay in constant contact with your team throughout the project. If you have an idea, or a quote you can't compare with another, let's talk about your custom application development project.
