App Development

Custom Apps That Solve Problems No Off-the-Shelf Software Can

From simple tools that save hours each week to complex systems that run entire operations—we build apps tailored to how YOUR business actually works.

Because your business isn't generic, your software shouldn't be either.

Do You Need This?

When Do You Need a Custom App?

Not every business needs custom software. Here's how to know if you do.

Signs You Need Custom Software

  • You're managing critical processes in spreadsheets
  • You're paying for 5 tools that don't talk to each other
  • Your workflow is unique and off-the-shelf tools don't fit
  • You're spending hours on tasks that should take minutes
  • Your industry is too niche for generic solutions

What Custom Apps Can Do

  • Automate repetitive manual work
  • Connect systems that don't integrate
  • Give you data visibility you don't have now
  • Scale with your business without switching tools
  • Become a competitive advantage

What We Build

From Simple Tools to Complex Platforms

We build apps across the entire spectrum of complexity. Here's what's possible.

Simple Tools

2–4 weeks
  • Quote generators for contractors
  • Appointment schedulers for service businesses
  • Client intake portals
  • Internal dashboards for tracking metrics

Business Systems

1–3 months
  • CRM alternatives for specific industries
  • Inventory management for warehouses
  • Booking systems with custom logic
  • Employee scheduling with SMS notifications
  • Customer portals with self-service

Complex Platforms

3–6 months
  • Multi-location operations management
  • Real estate portals with automated valuations
  • Marketplace platforms connecting buyers and sellers
  • Logistics and dispatch systems
  • Industry-specific SaaS products

Real Problems, Real Solutions

Apps Businesses Actually Need

These aren't hypothetical. These are real problems we've seen businesses face—and the kind of solutions we build.

  1. 01

    Cleaning Company Operations

    Problem

    Managing 15 cleaners across 40 locations with spreadsheets and WhatsApp groups

    Solution

    App that auto-assigns jobs from booking calendar, sends SMS to cleaners, tracks completion with photos

  2. 02

    Contractor Quoting System

    Problem

    Spending 2 hours creating quotes that may never convert, then losing track of follow-ups

    Solution

    Enter job details, auto-generate branded PDF quote, track follow-ups and conversion rates

  3. 03

    Property Management for Small Landlords

    Problem

    Managing 8 units with notes, spreadsheets, and missed maintenance requests

    Solution

    Rent tracking, maintenance scheduling, tenant communication, and digital lease storage in one place

  4. 04

    Client Intake Portal for Professional Services

    Problem

    Chasing clients for documents, passwords, and information via email for weeks

    Solution

    Guided portal where clients upload everything through checklists with automatic reminders

  5. 05

    Restaurant Reservation System

    Problem

    Paying expensive platforms that own your customer data and charge per booking

    Solution

    Your own system with SMS confirmations, waitlist management, and full guest data ownership

  6. 06

    Freelancer Approval & Payment Tracker

    Problem

    Chasing clients for feedback and invoices across email, Slack, and texts

    Solution

    Single dashboard for proofing, approvals, contracts, and automatic payment reminders

  7. 07

    Multi-Location Inventory System

    Problem

    No visibility into stock across warehouses and stores, constant stockouts or overstock

    Solution

    Real-time inventory tracking with low-stock alerts, transfer requests, and purchase order automation

  8. 08

    Industry-Specific CRM

    Problem

    Generic CRM has 50 fields you don't use, missing the 5 you actually need for your sales process

    Solution

    CRM built around YOUR pipeline stages, custom fields, and the integrations you actually use

See a problem similar to yours?

Our Services

What We Can Build For You

From web apps to SaaS products—here's everything we offer.

Web Applications

Full-featured web apps with rich interfaces, real-time updates, and modern UX

What's Included
  • Responsive design that works on any device
  • Real-time data updates and notifications
  • Role-based access control
  • Admin panels and user management
Use Cases

Dashboards, portals, management systems, internal tools

Deliverables

Deployed application, admin panel, user documentation, training

Progressive Web Apps (PWA)

App-like experience installable from browser, works offline, sends push notifications

What's Included
  • Install to home screen without app stores
  • Offline functionality and data sync
  • Push notifications
  • Fast loading even on slow networks
Use Cases

Field service apps, mobile-first tools, customer-facing portals

Deliverables

Cross-platform app, installation guide, offline sync setup

SaaS Products

Turn your expertise into a software product you can sell to others in your industry

What's Included
  • Multi-tenant architecture
  • Subscription billing with Stripe
  • User onboarding flows
  • Usage analytics and reporting
Use Cases

Productizing your expertise, industry-specific tools, startup MVPs

Deliverables

Scalable platform, payment integration, onboarding flow, landing page

Internal Tools & Dashboards

Custom admin panels and dashboards that give you visibility into your operations

What's Included
  • Data visualization and reporting
  • Workflow automation triggers
  • Integration with existing systems
  • Role-based permissions
Use Cases

Operations management, data visibility, team coordination, executive reporting

Deliverables

Custom dashboard, integrations setup, team training

API Development & Integrations

Connect systems that don't talk to each other and automate data flow between tools

What's Included
  • Custom REST or GraphQL APIs
  • Third-party integrations (Stripe, Twilio, etc.)
  • Data synchronization between systems
  • Webhook handlers and automation
Use Cases

Connecting tools that don't integrate, automating data flow, building integrations

Deliverables

API documentation, integration setup, monitoring and alerting

MVP Development

Fast-to-market prototype with core features only, built for validation before full investment

What's Included
  • Core features that prove your concept
  • User feedback collection built-in
  • Analytics to validate assumptions
  • Architecture that can scale later
Use Cases

Testing an idea before full investment, startup launches, internal pilot programs

Deliverables

Working MVP, user feedback system, iteration roadmap, investor-ready demo

Technology

What we build on

Common, widely used technology. If you ever want to continue with another team, you will find people who know it.

  • Web apps

    Next.js and React

    An interface that runs in the browser on a computer and on a phone. This website runs on Next.js too.
  • Data and login

    PostgreSQL and Supabase

    Database, login and user permissions by role.
  • App without the stores

    PWA

    An app installed from the browser onto the phone's home screen. It can send notifications and some features work offline.
  • Mobile

    Android and iOS

    When you need an app in Google Play and the App Store. Where possible, one app runs on both systems at once.
  • Integrations

    APIs and connections

    Accounting software such as Pohoda, SuperFaktúra or Fakturoid, payment gateways, SMS gateways and other systems through their APIs.
  • Artificial intelligence

    AI via API

    Reading documents, a chatbot or a voice assistant like Olívia in MôjLekár.app. We connect language models, for example from OpenAI, through their APIs.

Why Custom?

Why Custom Beats Generic

Off-the-shelf software works for generic problems. Here's why custom wins for everything else.

  1. 01

    Built for Your Workflow

    Generic tools force you to adapt your process to their limitations. Custom tools adapt to how you actually work.

  2. 02

    No Feature Bloat

    You only get what you need. No paying for 100 features to use 5, no confusing interfaces with options you'll never touch.

  3. 03

    Integrates With What You Have

    Connects to your existing tools instead of replacing everything. Your data flows where it needs to go.

  4. 04

    Grows With You

    Add features when YOU need them, not when the vendor decides to. Your roadmap, not theirs.

  5. 05

    Competitive Advantage

    Your competitors use the same generic tools. Your custom system is yours alone—it becomes a moat.

  6. 06

    No Per-Seat Ransoms

    Pay once to build it. Scale to 100 users without 100x the cost. Your team grows, your software bill doesn't.

Process and timeline

How long app development takes

A simple tool is usually ready in 2–4 weeks, a business system in 1–3 months, a complex platform in 3–6 months. This is the path from the first call to launch for a business system.

  1. 011 week

    Intro call and scope

    We name the problem, go through how you work today, and separate must-have features from those that can wait.

    DeliverableFeature specification and a fixed quote with a schedule

  2. 021–2 weeks

    Clickable prototype

    Screen designs you can click through before any programming. Changes at this stage are quick and cheap.

    DeliverableFigma prototype and your sign-off

  3. 033–8 weeks

    MVP built in parts

    We build the first usable version with the core features. Every week or two you see and try a finished part.

    DeliverableWorking parts every 1–2 weeks, a test environment

  4. 041–2 weeks

    Launch and adjustments

    We deploy the app, train your people and keep adjusting it based on real use.

    DeliverableLive app, training, documentation

After launch you can add features in smaller phases, each with its own scope and price.

Cost

How much custom app development costs

Indicative prices by type of app. You get the exact amount after the intro call, as a fixed quote with a scope.

How much custom app development costs
Type of appWhat it usually isIndicative price
Simple internal toolOne process and a few screens: a quote generator, a job log, a simple PWA.€3,000 – €10,000
Booking system or client portalA web app with login, roles, notifications and connections to the tools you already use.from €9,000market range €8,000 – €30,000
Complex platformMany users and roles, payments, several branches, integrations or your own SaaS product.from €30,000
Mobile app for Android and iOSAn app in Google Play and the App Store. A simple app €3,000 – €10,000, a business app €10,000 – €30,000.€3,000 – €30,000

These are indicative ranges, not a price list.

Only need a mobile app? See mobile app development

What drives the price

  • Number of roles and screens: who logs in and what they may do.
  • Connections to other systems: accounting, payment gateway, SMS, e-shop.
  • Whether a web app or PWA is enough, or you also need an app in the stores.
  • AI features, such as reading documents or a voice assistant.
  • Moving old data across and changes to the brief during development.

Running costs after launch

  • Server and database: for apps typically €30 – €150 a month on the market, depending on users and data volume.
  • Maintenance, meaning updates, backups and fixes: with us from €49 a month, scope depends on the app.
  • Usage-based fees of other services: SMS, payment gateway, AI, app stores.
  • We put the running costs in the quote, so nothing surprises you after launch.

The cheaper start is an MVP: a smaller first version with only the core features. You add more once the app proves itself.

Our Apps

Apps We've Created

Our own apps and client projects—all built with the same quality and attention to detail.

Our app

MôjLekár.app

Communication system for medical practices

Who it is for
For medical practices. Clinics in Slovakia already use it.
Problem
Instead of patients, the nurse spends hours answering the phone. The doctor keeps getting interrupted by prescriptions and sick notes.
What we built
A communication system for clinics: a website for patients, a mobile app and Olívia, an AI assistant on the phone. E-prescriptions, sick notes and confirmations take a few clicks, and SMS reminders cover appointments.
Result
Clinics in Slovakia use it. Olívia answers up to 8 calls at once, and patients book without waiting on the line.
Learn more about MôjLekár.app
MôjLekár.app – website for a practice's patients
MôjLekár.app – mobile version

Our app

kupnazmluva.online

A property purchase contract from the title deed in 5 minutes

Who it is for
For real estate agents and agencies.
Problem
Real estate agents put together purchase contracts from online templates that are not reliable.
What we built
A web app in which the assistant Harvie reads the title deed (plots, shares and encumbrances) and drafts the contract. Before generating it, the contract passes more than 60 checks against the Cadastral Act.
Result
A purchase contract and the land registry application within 5 minutes, in Word and PDF, ready to sign.
See kupnazmluva.online
kupnazmluva.online – home page
kupnazmluva.online – mobile version

Client project

BOZP Academy

Complete occupational safety documentation in 10 minutes

Who it is for
For shops, warehouses, offices, e-shops, services and low-risk food service businesses.
Problem
Every employer must have up-to-date occupational health and safety (OHS) documentation.
What we built
An app where a company enters its details, premises and job roles. It generates policies, a risk assessment and the PPE annex following the method of authorised safety technicians, plus online OHS and fire safety training with a test and certificate.
Result
Complete OHS documentation within 10 minutes, in Word and PDF, with the company letterhead and ready to sign.
See BOZP Academy
BOZP Academy – home page
BOZP Academy – mobile version

FAQ

Frequently Asked Questions

Answers to the questions we hear most often about custom app development.

01How much does a custom app cost?
Indicatively: a simple internal tool or PWA €3,000 – €10,000, a web app or client portal from €9,000 with us (the market range is €8,000 – €30,000), a complex platform from €30,000. After the intro call you get a fixed quote with a scope. If the budget is smaller, we start with an MVP, a smaller first version, and add features in phases.
02How long does it take to build a custom app?
Simple tools can be ready in 2-4 weeks. Business systems typically take 1-3 months. Complex platforms may take 3-6 months or longer. We'll give you a realistic timeline after understanding your requirements—not a sales pitch.
03What is custom software, and when is it worth more than an off-the-shelf product?
Custom software is built around how your business actually works: it has only the features you use and connects to the tools you already have. Off-the-shelf software is a subscription you adapt yourself to. Custom software pays off when you pay for several tools that don't talk to each other, or when your process doesn't fit any of them. If an off-the-shelf product suits you, we'll tell you plainly.
04What is a custom web application?
A program that runs in the web browser and is built for your business: a booking system, a client portal, ordering or an internal overview. Nothing to install, and it works on a computer and a phone. If you want it as an icon on the phone's home screen, it can be installed as a PWA without the App Store or Google Play. With us it starts from €9,000.
05What can a business app replace?
Most often spreadsheets, paper lists and emails that orders, appointments, approvals or documents travel through today. A business app puts them in one place, everyone sees what they need, and it handles repeating steps such as reminders, documents or reports on its own.
06Can you work with our existing systems and data?
Absolutely. Most projects involve integrating with existing tools—CRMs, accounting software, payment processors, spreadsheets. We'll map out what connects to what during discovery and make sure data flows where it needs to.
07What if my needs change after we start?
That's why we build in sprints. Requirements evolve as you see the app take shape—that's normal. We adjust scope as we go, with clear communication about how changes affect timeline and cost.
08Who owns the app's source code?
You do. Once paid, everything we build for you is yours: source code, design files and documentation. You can host the app yourself, hire another team later, or sell it. No lock-in.
09What if your company closes or we stop working together?
The app keeps running. The source code and documentation are yours, so another developer or your own team can take it over and develop it further. We build on widely used technology (React, Next.js, PostgreSQL), so finding people who know it is not a problem.
10What's the difference between a web app and a mobile app?
Web apps run in browsers and work on any device. Mobile apps are installed from app stores. For most business use cases, Progressive Web Apps (PWAs) give you mobile app functionality without the cost and complexity of app store submissions.
11Can you help us figure out what we actually need?
That's what the discovery phase is for. Many clients come to us with a vague problem and leave with a clear solution. We'll map your workflows, identify the pain points, and recommend the simplest solution that actually solves the problem.
12What happens if something breaks after launch?
We offer support and maintenance packages for ongoing peace of mind. Bug fixes, security updates, small improvements—we're there when you need us. You can also bring in your own team later since you own the code.
13I have an idea for a SaaS product. Can you help me build and launch it?
Yes. We've helped founders go from napkin sketch to paying customers. We can build your MVP, set up subscription billing, and create a landing page. We focus on getting you to market fast so you can validate before investing heavily.

For English-speaking companies in Slovakia

Custom software for English-speaking teams

Business software is only useful if the whole team can work with it. For companies whose staff read English better than Slovak, we build the interface in English, in Slovak or switchable between the two, and we write the documentation in the language your team actually uses.

  • Interface language switchable per user, so a Slovak accountant and an English-speaking manager can use the same system.
  • Links to Slovak accounting tools such as Pohoda, SuperFaktúra and Fakturoid are covered in our integration guide.
  • Invoicing rules in Slovakia are changing; see our guide to e-invoicing from 2027 before you plan invoice-related features.

Free Discovery Call

Have a Workflow That's Driving You Crazy?

Let's talk about whether a custom app makes sense for your situation. No pressure, just clarity.