Should we go native or cross-platform?

It depends on your budget, target audience, and UX requirements. Native (Swift / Kotlin) delivers the best performance and platform feel but costs more to maintain across two codebases. Cross-platform (React Native or Flutter) reduces cost and time-to-market significantly with minimal UX trade-offs for most use cases. We'll recommend the right approach after understanding your goals.

Do you handle App Store submission?

Yes — end-to-end. We manage the full submission process including screenshots, preview videos, metadata, compliance checks, and responding to any reviewer questions. You just approve and we handle the rest.

What happens if Apple rejects the app?

Rejections happen and we handle resubmissions as a standard part of the process — at no additional cost. We stay with the app until it's live on the store.

App Development

Apps Your Users Actually Want to Open

A great product deserves a great app. We build native iOS, Android, and cross-platform mobile applications — performant, polished, and built to retain users from day one.

Get a Free Quote View Our Work

Sound Familiar?

Does Any of This Sound Familiar?

Your idea is stuck in a notebook

A great concept without the right team to execute it stays an idea forever — while competitors move first.

Previous developers went over budget and missed deadlines

Vague scoping and poor communication are the silent killers of most app projects. You deserve better.

Users download your app but don't come back

Retention is a design and product problem, not a marketing problem. If the core loop doesn't hook users, no ad spend will fix it.

You're not sure whether to go native or cross-platform

The wrong architecture choice costs months and thousands to undo. Getting this right at the start is everything.

What's Included

Native Quality. Cross-Platform Flexibility.

iOS Apps

Swift-built native iOS apps that meet Apple's highest standards — fast, secure, and optimised for every iPhone and iPad on the market.

Android Apps

Kotlin-powered Android applications that work flawlessly across the full device ecosystem — from budget handsets to flagship hardware.

Cross-Platform Apps

One codebase, two platforms. React Native and Flutter apps that look and feel native — delivering two audiences at a fraction of the cost.

Our Process

From Idea to App Store

Discovery

We map your user journeys, define core features, and agree on the MVP scope before any design begins.

Design & Prototype

Interactive Figma prototypes let you experience the app and give feedback before development starts.

Development

Agile sprints with weekly demos. You see progress continuously and stay in control of priorities.

QA & Launch

Comprehensive testing across devices, App Store / Play Store submission, and a smooth go-live.

Why Concept Window

We Build Products, Not Just Apps

UX-first from the ground up

We design every interaction before we build it. Your users get an experience that feels obvious — because we sweat the details so they don't have to.

Scalable architecture by default

We build for the version of your business 18 months from now, not just today. Clean, documented codebases that your team can own and extend.

App Store submission included

We handle the full submission process — metadata, screenshots, compliance, and review responses — so your launch isn't delayed by admin.

Post-launch support & iteration

User feedback is gold. We stay engaged post-launch to help you iterate, fix edge cases, and ship the features that drive retention.

FAQ

Common Questions

Got an App Idea?

Let's Turn It Into a Product

Share your idea in a free 30-minute call. We'll map out scope, tech approach, and a realistic timeline — no obligation.

Book a Free Discovery Call