A custom web application is software your business runs in a browser: a client portal, a quoting tool, a booking system, an internal dashboard. Because each one is built around how a particular business works, there is no price list. There is a starting point, and there are the things that move the number. This guide covers both, with our own prices next to published market figures.
The short answer
Our custom web applications start at $2,500 as a fixed-price project, and most take 4 to 12 weeks. That is where a focused tool begins; your price comes back as a written scope with a fixed price and a delivery date within two business days.
For the wider market, Clutch's web development pricing guide, built from verified client reviews, puts the average web development agency project at $66,499, with a typical timeline of nine months and average agency rates of $25–$49 an hour. Clutch also notes that most web development projects on its platform cost less than $10,000. Those figures mix simple websites with full applications, so read them as the shape of the market rather than a quote for your project.
What actually moves the price
- Scope. Screens, user roles, features and reports. Every line in a quote should map to something you can point at, so cutting a line cuts a known amount.
- What already exists. A clean design file and a tidy codebase quote lower than a legacy system nobody has touched in years. Migrating data out of an old system is often the part that surprises people.
- Integrations. Connecting to your CRM, payment provider, ERP or accounting software adds work for each system, and more when the other side has its own review process or a limited API.
- Timeline. A comfortable deadline is the cheapest one. A genuine rush costs more because it displaces other scheduled work.
Three common shapes, and what makes each cost more
- Internal tools and dashboards. Used by your own team, so the interface can be plain. Cost rises with the number of data sources and reports, and with how many roles need different views.
- Client portals. Your customers log in to see orders, documents or project status. Cost rises with account management, permissions, notifications and anything that has to be polished because customers see it.
- Platforms with billing. Subscriptions, invoices, plans and payment handling. The most involved shape, because money flows through it and mistakes are expensive. Our own accounting product, Account Trail, is this kind of build.
Fixed price, retainer or a dedicated developer
- Fixed-price project, from $2,500. Best for a defined build with a clear finish line. You get a written scope, a fixed price and a date before work starts, and the price only moves if the scope does.
- Maintenance retainer, from $750/month. A set number of hours each month for updates, fixes and small features, with unused hours rolling over one month.
- Dedicated developer, from $4,800/month. A senior developer reserved for you, for products that keep evolving. For comparison, the median pay for a US software developer is $135,980 a year ($64.44 an hour) before benefits, according to the US Bureau of Labor Statistics (May 2025).
The costs people forget
- Hosting and third-party services. Servers, email delivery, file storage and any paid APIs are ongoing costs, separate from the build.
- Life after launch. We fix bugs in delivered scope free for 30 days. After that, updates and small changes are covered by a retainer, or your own team takes over, since the code and documentation are yours.
- Changes of mind. New requirements mid-build are normal. On a fixed-price project they are quoted in writing and approved before anyone builds them, so the invoice never surprises you.
How to get an accurate number
Describe the outcome rather than the solution: who uses the application, what they need to do, which systems it has to talk to, what exists today and when it has to be live. A rough answer is fine. Send that as a brief and you get a written scope, a fixed price and a delivery date within two business days.
A number without a scope is a guess. The starting price tells you where we begin; the written scope tells you what yours costs.
More on how we build these: Web Applications & Custom Development. Ready to describe yours? Start a project.