Custom web and mobile applications
Custom application development
When off-the-shelf tools do not fit the way you work: web and mobile applications, internal tools and system integrations — from idea to delivery and maintenance.
Byte Expert — custom application
by agreement
Hourly rate €50/h·Price on 10 Sep 2026: €50/h
- Backend, frontend, database and API
- Integration with web shops, accounting and ERP
- Java, TypeScript, React, Angular, PHP, .NET
- Support and development after delivery
Software that follows your business, not the other way round
Many companies run on spreadsheets, copy data by hand from one system to another, or pay for expensive tools they use a tenth of. A custom application does exactly what you need.
We build web applications, internal business tools, mobile apps and API integrations between existing systems. We also run our own products in production — the Bela Blok app and a licensing and update service for WordPress plugins — and have integrated web shops with accounting and courier services.
We work in phases: first the smallest useful version, then improvements based on real use. You get results sooner and do not pay for features nobody uses.
Why Byte IT
- You work directly with the developer — no middlemen or sales agents
- Prices are published, each with the price valid on 10 Sep 2026
- Reply to your inquiry within one business day
- Working for businesses across Croatia since 2019
What we do
Analysis and specification
Together we define what the application must do, for whom and in what order — before the first line of code.
Web applications
Internal tools, client portals, bookings, records and dashboards — running in the browser, no installation.
Mobile applications
Mobile apps, including PWAs installed straight from the web.
Integrations and APIs
We connect web shops, accounting, ERP, couriers and external services so data is never retyped.
UI/UX design
Interfaces users understand without a manual — design and prototype before development.
Maintenance
Upgrades, security patches, monitoring and new features after delivery.
Development pricing
Custom applications are billed by the hour. Before we start you get an estimate per phase, so you know what each step costs.
Byte Expert
by agreement
Hourly rate €50/h·Price on 10 Sep 2026: €50/h
- Custom application
- Backend + frontend + design
- Built to your specifications
- Integrations with external services
- Database and API
- Ongoing support
Related services
UI/UX design and development
€45/h
Price on 10 Sep 2026: €45/h
Mobile app development
€50/h
Price on 10 Sep 2026: €50/h
API development and integration
€50/h
Price on 10 Sep 2026: €50/h
Data and database migration
€45/h
Price on 10 Sep 2026: €45/h
Database administration
€45/h
Price on 10 Sep 2026: €45/h
Cloud infrastructure management
€45/h
Price on 10 Sep 2026: €45/h
Prices come from our published price list; each one is shown with the price valid on 10 Sep 2026. The final price depends on scope and agreement.
How we work
- 1
Inquiry
Tell us what you need — via the form below, by e-mail or by phone.
- 2
Quote
Within one business day we get back with questions or a quote: scope, timeline and price.
- 3
Build
We work in agreed steps and show progress — no surprises on the invoice.
- 4
Delivery and support
We hand over the finished work with instructions and stay available for changes and maintenance.
With every project
- Specification and per-phase estimate before we start
- Regular progress reviews
- Testing and production deployment
- Documentation and user instructions
- Optional maintenance after delivery
See what we have built
Websites, web shops and applications we built for clients and for ourselves.
View referencesFrequently asked questions
How much does an application cost?
It depends on the scope, so it is billed by the hour (the rate is shown above). After a conversation you get an estimate per phase; the first phase is usually the smallest useful version.
How long does it take?
A simpler internal tool can be ready in a few weeks, while more complex systems are built in phases over several months. Timeline and phases go into the quote.
Which technologies do you use?
Java, TypeScript and JavaScript (Node.js, Next.js, React, Angular), PHP and .NET, with PostgreSQL and MySQL databases. We choose based on the project and the systems you already have.
Can you improve an existing application?
Yes. We take over applications built by others: we first review the code and the system, then propose fixes and improvements.
Can you connect our web shop to accounting?
Yes, it is a common request. We connect WooCommerce and other shops to accounting software, couriers and warehouses via APIs or file import and export.
I only have an idea, no specification. Is that enough?
It is. Describe the problem you want to solve; we write the specification together in the first phase.
Describe your idea
What should the application do, who will use it and which systems must it connect to? A few sentences are enough.