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DEVELOPMENT
Custom web tools

CUSTOM WEB
APPLICATIONS

Interactive 3D calculators, visualisation generators, interactive maps, AJAX searches, client dashboards. I build tools that outrank competitors in Google and convert better than a contact form.

WHY AN APP

Your competitors write articles.
You can give users a tool.

An article describes a problem. An app solves it. The difference in user behaviour is enormous. Someone using a calculator for 8 minutes sends Google a completely different signal than someone who closed an article after 45 seconds. Google knows. And rewards it.

5–10×
longer time on page

Dwell time is a strong SEO signal. A user playing with a calculator stays 8+ minutes. An article — 45 seconds.

Intent
lead at the moment of purchase

A construction cost calculator is used by someone actively looking for a contractor. An article is read by someone who is still just considering it.

Ctrl+C
can't copy an app

An article can be rewritten. An interactive tool requires months of work — a barrier to entry for competitors.

TOP
transactional phrases

A calculator ranks for "calculator + industry" phrases that articles will never capture. Zero competition, high intent.

CASE STUDIES

Projects and their results

HERO CASE STUDY

TOP 2 Google in days — because competitors have PDFs, we have 3D

Construction machinery · 3D crane load capacity calculator

PROBLEM

Construction machinery industry. Every competitor had the same PDFs with parameter tables. Specialists need to know how much a crane lifts at a given reach — and nobody was giving them a tool. Just data in a table.

SOLUTION

Interactive 3D calculator in the browser. The user slides the reach, changes the load — the crane model updates in real time. Data based on real parameters of top manufacturers. One tool that does what no competitor offered.

✓ TOP 2 Google days after indexing✓ Organic CTR nearly 7%✓ 40% of users proceed to the offer
Tech: WordPress + Three.js + PHP

An MMA industry portal dominated a niche held by giants for a decade

Sportywalki.com.pl · case study →
PROBLEM

Marcin ran an MMA accessories shop in a niche dominated by companies active for over 10 years. Classic marketing — ads, product SEO — couldn't break through the authority of the old players. He needed a different way into the market.

SOLUTION

Instead of fighting the giants head-on — we built an MMA portal with a sports club search engine. An interactive map, filters by discipline and location. The site educated users and funnelled them to the shop. It was his "third site" in a multi-brand ecosystem.

✓ Growth in traffic to service subpages✓ Natural topical link network✓ Increased interactions and session time
Tech: WordPress + Leaflet.js + WooCommerce + AJAX

Mockup & visualisation generator — lead in exchange for value

Adra Paintings · case study →

The user uploads their own image, applies it to an interior template and sees how it would look on a wall. The finished visualisation is downloaded after providing an email. More effective than a contact form — the lead appears at the moment of decision, not before. The whole thing built natively in WordPress without external APIs.

✓ Lead magnet 2.0 — email in exchange for value✓ Higher conversion rate vs contact form✓ User in the decision phase initiates contact
Tech: WordPress + PHP (GD/ImageMagick) + Elementor

Interactive project map — natural local SEO from every pin

Service company with nationwide reach

A static list of projects replaced by a map with AJAX filtering by discipline and location. Each marker leads to a service subpage. Result: the site began ranking for "service + location" phrases that competitors had previously captured. Natural internal linking without a single backlink.

✓ Ranking for "service + location" phrases✓ Natural internal linking✓ Better UX than a static list
Tech: WordPress + Leaflet.js + AJAX + WooCommerce

Comparator with PDF export — lead from the highest buying stage

Machinery and equipment industry

A crane comparator with attribute filters. The user selects models, exports a summary to PDF. The PDF is delivered by email — the company gets a lead at the moment when someone is actively comparing models before purchasing. The best possible intent.

✓ Higher conversion rate than a form✓ Lead in an advanced decision stage✓ Ranking for "comparison + product type" phrases
Tech: WordPress + PHP + AJAX + mPDF

Custom WooCommerce dashboard — store admin without WP Admin

Podsztanga.pl · case study →

A dedicated panel for the store owner — a custom view of orders, statuses and history instead of the default WP Admin. Integration with the WooCommerce database. Order handling done in half the time.

✓ Reduced order processing time✓ Better UX for the store owner✓ More efficient store administration
Tech: WordPress + WooCommerce + PHP + MySQL
Read detailed case study
FILOSOFIA

Why an app beats an article

ARTICLE

Describes a problem. The user reads for 45 seconds and leaves. Google sees a high bounce rate. An article can be copied — a competitor does it over a weekend. Informational phrases, low purchase intent. Loses relevance after 6–18 months.

APP

Solves a problem. The user engages for 8–12 minutes. Google sees high dwell time = quality. Copying it requires months of work. Transactional phrases with high intent. The first app in a niche dominates for years.

SERVICES

Types of applications I build

Calculators & configurators

Online tools that answer user questions in real time. Pricing calculators, product configurators, ROI calculators. They rank for phrases with high purchase intent.

  • 2D and 3D calculators
  • Product configurator
  • ROI / savings calculator

AJAX searches & filters

Dynamic searches with filters without page reloads. They shorten the path to a product and increase the number of interactions. A standard that is still missing from most sites.

  • AJAX filtering
  • Product search
  • Filtered catalogue

Interactive maps

Project maps, dealer finder, branch finder. Each map point is a separate subpage — natural internal linking and ranking for local phrases.

  • Project map
  • Dealer finder
  • Branch finder with filtering

Generators & online tools

Tools that generate unique value for the user: mockups, visualisations, reports. A next-generation lead magnet with email gate.

  • Mockup generator
  • Quote generator
  • Email-gated tools

SaaS apps & dashboards

Custom applications with authentication, client panels and dashboards. Built in Next.js with a full backend or as a WordPress extension.

  • Client panel
  • Reporting dashboard
  • Login-based app

Integrations & automations

Connecting existing systems with new tools. Integrations with CRM, ERP, external APIs. Automations via Make.com, Zapier, n8n.

  • Integracje API
  • Automatyzacje Make.com / n8n
  • Webhook i data sync
TECHNOLOGIE

Tech stack

Frontend
  • Next.js 15
  • React 19
  • TypeScript
  • App Router
WordPress
  • Custom PHP
  • Elementor
  • ACF
  • REST API / WPGraphQL
Visualisations
  • Three.js (3D)
  • Leaflet.js (maps)
  • Chart.js
  • D3.js
Backend / DBs
  • MySQL
  • PostgreSQL
  • Supabase
  • PHP
Automations
  • Make.com
  • n8n
  • Zapier
  • Webhooks
Client Reviews

What clients say

Google
★★★★★
5.0· 10 opinii
Max Mazurkiewicz

Max Mazurkiewicz

Founder

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CONTACT

Let's discuss your project

Tell me what you want to build — I'll tell you what's possible, which technology to choose and how the app can impact your SEO and conversions.

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