Web application development.
Some ideas outgrow a website the day they are written down: booking systems, calculators, member areas, anything a user interacts with rather than reads. We build those as proper web applications on React and Next.js, fast to use and sane to maintain.
Scope my application ↗Overview
Projects
Usage
Team
Billing
When plugins stop being enough.
The problem
Teams try to stretch a website into an application: a form plugin here, a members plugin there, spreadsheets holding it together behind the scenes. It works until real users and real data arrive.
Our solution
We build the application as an application: a real data model, interfaces designed around the workflow, and an architecture that handles growth instead of collapsing under it.
Not sure if your idea is a website or an application? Ask us, it is a ten minute answer.
Book a free call ↗Web application services.
Interactive products, from a single smart feature to a full application.
Full web applications
Complete applications with accounts, roles, data, and workflows, built as products rather than pages.
Booking & scheduling systems
Appointments, reservations, and availability logic with payments and reminders built in.
Interactive tools & calculators
Quote builders, configurators, and calculators that turn visitors into qualified leads.
Membership & account areas
Login, profiles, and gated content with the right access for each kind of user.
Workflow applications
Multi-step processes, approvals, statuses, and notifications, modeled the way your operation really runs.
Data-heavy interfaces
Search, filters, and tables that stay quick when the records run into the hundreds of thousands.
Not sure which of these you need? We will map it with you in a free call.
Book a free call ↗The application stack.
A modern, typed toolchain chosen for speed today and maintainability years from now.
From idea to shipped application.
Scoped small, shipped early, grown from real usage.
Why teams build applications with us.
Application work punishes shortcuts late. We take none early.
Architecture before pixels
The data model and flows are designed first, so the app does not need rebuilding at its first growth spurt.
Typed, tested code
TypeScript end to end and tests on the paths that matter, so changes stay cheap for years.
Fast for real users
Interfaces that respond instantly even on average connections, because users judge in milliseconds.
Handover without hostages
Documentation, clean repos, and no dependency on us to keep the thing alive.
Web apps fit when.
Industries we serve.
Think GAP3 is the right fit for your team? Tell us about your project.
Start a project ↗Web application questions, answered.
A website is read; an application is used. If your users log in, enter data, book, calculate, or move through a workflow, you are building an application, and the architecture should reflect that from day one.
They give applications a fast, flexible interface and an architecture that grows without a rewrite. They are also widely known, so you are never locked to one team, including ours.
Yes. Applications regularly live alongside a WordPress site, share its look, and pass users between the two without friction.
A focused tool ships in weeks; a complete application with accounts and roles usually runs two to four months. We ship the core early so you use it while the rest is built.
It follows the scope: a calculator is a small fixed project, a full workflow application is a larger one. Every quote is fixed and itemized before we start.
Yes. We set up hosting, deployment pipelines, monitoring, and backups, and hand you the keys with documentation.
Yes. We audit the code first and give you an honest read on whether to extend, refactor, or rebuild, with the reasoning in writing.
That is a design goal. Typed code, conventional structure, and documentation mean any competent developer can pick it up, not just us.
We build responsive web applications that work well on phones, including installable progressive web apps. For fully native mobile apps we will tell you honestly whether your use case needs one.