Full-stack product studio

Launch your app in weeks, with AI built in

We design, build, and launch mobile apps, web apps, and custom websites, with AI woven in from day one. One team takes you from first idea to a live product.

Book your free call Start your project

See our work

Free 30-minute discovery call. Fixed scope and price agreed up front. No obligation after the call.

11+ Years building
10+ Products shipped
70+ Apps published
3,000,000+ Combined downloads
24h Reply time

Launch

You own 100% of the code
Fixed scope and price up front
Not happy after milestone one? Walk away, owe nothing

The modern stack we build on

Flutter
React
Astro
WordPress
TypeScript
Tailwind CSS
Firebase
Supabase
OpenAI
Claude
Stripe
RevenueCat
Resend
OneSignal
Vercel
Cloudflare
Flutter
React
Astro
WordPress
TypeScript
Tailwind CSS
Firebase
Supabase
OpenAI
Claude
Stripe
RevenueCat
Resend
OneSignal
Vercel
Cloudflare

Products we have shipped

Why projects stall

Most products never make it to launch

Slow builds, generic UX, and platform friction kill momentum. We remove all three.

Slow development

Traditional builds drag on for months. We ship polished, production-ready products in weeks with Flutter, React, and AI-assisted workflows.

DATA_PACKET_01 // SPEED_OPTIMIZED

Generic experiences

Template-driven apps feel lifeless. We craft custom interfaces with motion and detail your users actually remember.

DATA_PACKET_02 // MOTION_ACTIVE

Platform friction

Building separately for every device wastes time and budget. One codebase flows across iOS, Android, and web.

DATA_PACKET_03 // CROSS_SYNC

How we work

Your vision, unconstrained.

We pair modern engineering with senior design judgment and AI tooling, so your product goes from concept to launch in record time, without cutting corners on quality.

Rapid delivery, weeks not months
AI features built into the core
Production-grade, high-performance builds

[ THE_DIFFERENCE ] AI alone Cheap route With us

Looks done

Built for your idea

You stay hands-off

Optimized, reliable code

Expert-tested

Launched and supported

AI and cheap shortcuts get you started. A senior expert ships the real thing.

4 wk

Typical MVP timeline

[ NODE_SCALING: 4.0 ]

Capabilities

Everything you need to ship

Cross-Platform App Development

Cross-platform app development: native-quality iOS and Android apps from one Flutter codebase, shipped in weeks at a fixed scope and price.

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Web App Development

Web app development with React and Astro, from focused tools to full SaaS platforms. Built to scale, tuned for speed, at a fixed price.

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AI Integration Services

OpenAI and Claude built into your product logic to power real, useful features. Practical AI integration that earns its place, not gimmicks.

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MVP Development for Startups

MVP development in weeks, not quarters, so you can launch, learn, and raise faster. Fixed scope, fixed price, and a clear path to grow.

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Custom Website Development

Custom website development on Astro or WordPress: high-converting marketing sites tuned for speed, SEO, and turning visitors into customers.

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Backend Development and Integration

Backend development and API integration: secure auth, solid data, and apps that connect to the business system you already run.

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UI/UX Design

Product design that feels premium and converts: interface systems, user flows, and visual identity for apps, web apps, and AI products.

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Internal Business Apps

Apps for the people who do the work, plus the admin panel the office runs them from, wired into the system your company already uses.

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Explore all services

Selected work

Recent work

View all work

Apartmanom

Web App · Cross-platform App · Business Systems

Frendex

Cross-platform App · UI/UX Design

PipTrend

Web App · AI · UI/UX Design

Tudatosság Klub

Cross-platform App · Web App · UI/UX Design

Client voices

Trusted by founders

By far my best freelance experience ever! I will definitely hire him again! Janos did extra steps that he wouldn't have to do, but still did! Our communication was perfect! I could tell that he definitely knew what he is doing! Thanks a lot.

Hussein Al-Rammahi

MizanMe

CompletApp transformed our business. We needed an app to launch quickly but did not have the in-house expertise, and they delivered a beautiful, functional app in just weeks.

Sarah T.

Marketing Director, FreshBite Foods

Fast, reliable, and easy to work with. As a startup founder I needed an app to demo to investors, and CompletApp delivered a sleek, responsive design that matched my vision perfectly.

David M.

Founder, FitForce

Exceeded all our expectations. We struggled for months to find the right team to bring our app idea to life, and CompletApp made it happen.

Emily J.

CEO, Bright Ideas Consulting

Amazing app development service. CompletApp helped us build an app that truly represents our brand.

James P.

Operations Manager, GreenTech Solutions

The perfect app for our business. We did not have the technical know-how to build an app ourselves, but CompletApp made the process so simple.

Laura R.

CTO, StyleSquad

Great template and support. I purchased the custom chat template for FlutterFlow and it has been a game changer.

Alex H.

FlutterFlow builder

Process

A seamless 4-step journey

01

Discover

We dig into your goals, users, and market to define exactly what to build.

SCAN_INITIATED
02

Design

High-end UI and UX, mapped and prototyped before a line of code is written.

RENDER_ACTIVE
03

Build

Rapid, iterative development with weekly previews you can actually click.

COMPILING_CODE
04

Launch

Testing, store submission, and a smooth, fully supported go-live.

DEPLOY_STATUS:OK

Inquiries

Frequently asked questions

Most MVPs go from concept to a functional, high-fidelity product in around 4 weeks. We focus on the core value loop first so you reach market quickly.

Flutter for cross-platform apps, React and Astro for web, Firebase and Supabase for backends, Stripe and RevenueCat for payments, plus OpenAI and Claude for AI. We pick the right tool for each job.

Every project is scoped individually, but we always agree a fixed price before we start. No open-ended hourly surprises. Book a free discovery call for an estimate.

Yes. We offer ongoing maintenance and growth packages to fix issues, add features, and evolve your product as your users and the platforms change.

We grew out of FlutterFlow and now build with full-code Flutter and modern web stacks for more control and performance. Our FlutterFlow templates are still available in the Templates section.

You own your code and accounts from day one, so you are never locked in. For larger builds we agree handover documentation up front, and you can take the project anywhere if you ever need to.

You do. On full payment, all rights to the application and its code transfer to you, with no lock-in to us or any platform.

We agree a fixed scope and price up front and work in milestones. If you are not satisfied after the first milestone, you are under no obligation to pay anything further.