The cost of a custom web application depends on what it has to do: the screens and user roles, the integrations with other systems, the data it handles, and how much is still unknown at the start. A reliable estimate needs a clear understanding of the requirements. When much is unclear, a paid discovery phase defines them first.
What drives the cost
Features, screens, and user roles
Every screen, workflow, and permission level is work to design, build, and test. An application for one team with one role is simpler than one with clients, staff, and administrators.
Integrations
Connecting to payment services, accounting tools, a CRM, or other systems adds work, and depends on what those systems' APIs allow.
Data
How much data exists, whether it moves from another system, and how sensitive it is all affect the work.
Hosting and infrastructure
Where the application runs, how it is deployed, and how it is backed up and monitored.
Uncertainty
The less is known at the start, the wider any estimate has to be. That is why discovery matters.
Where the work goes in a project
- Discovery: requirements, scope, architecture, integrations, and risks.
- Design: screens and flows for each user role.
- Development: the application, its data, and its integrations.
- Testing and launch: checking key flows, roles, and data before going live.
- After launch: fixes, updates, and changes as your process evolves.
Starting with a first version (MVP)
A first version, often called a minimum viable product or MVP, includes only what the main users need to do their core job: the key screens, the essential roles, and the integrations the process can't work without. Everything else waits for later stages. A smaller first version costs less, reaches real users sooner, and shows which features matter before you pay for them.
The risk is cutting too much. A first version that leaves out something essential, such as a permission your staff need or an integration that saves hours of manual work, may not get used. Decide the must-haves with the people who will use the application, and write down what is deliberately left for later.
How to keep the cost under control
- Start with the must-haves and plan later features as separate stages.
- Write requirements down before asking for estimates.
- Check whether part of the need is better served by a product you can buy.
- Agree how changes to the scope are estimated and approved.
Ongoing costs
- Hosting or servers, and third-party services, paid by you directly
- Support, updates, and changes after launch
- New features as your process changes
How to get a reliable estimate
- Describe the problem and the people who will use the application.
- List the systems it must connect to.
- Separate must-haves from later ideas.
- Ask for a written scope with milestones, exclusions, and price.
Build or buy?
If an existing product covers your process well, adopting it may be the better choice. Custom software makes sense when your process doesn't fit the tools you can buy.
How DEXVANE prices web applications
Every project gets a custom quote. The process is an initial discovery call, paid discovery where needed, and then a written estimate before work starts. Projects with significant uncertainty start with paid discovery that covers requirements, scope, architecture, integrations, and risks; its price is listed on the web application development page. See web application development and, for connecting existing systems, API development & integrations.