ModernApp Labs

ModernApp Labs · Windows App Studio

Native Windows apps,
built without compromise.

We use the raw power of WinUI 3 to build high-performance Windows applications with entirely custom interfaces — going far beyond what default Fluent controls allow.

Microsoft StoreGet ModernPDF MergerView all apps ›
15k+
Global installs
5+
Apps published
4.8★
Average rating
WinUI 3
Core engine
Store
MS Certified

Our mission

Breaking the
Fluent mold.

Windows has incredible power under the hood — but standard Fluent controls only go so far. ModernApp Labs exists to build what's next. We take the high-performance engine of WinUI 3 and build completely custom, non-Fluent interfaces on top of it.

Whether it's a minimalist aesthetic or a completely bespoke canvas, we override default templates to prove that native Windows apps don't have to look like default Windows apps.

Read our story ›
PDF icon
ModernPDF Merger
Now on Microsoft Store

Merge, split, and secure PDF files — powered by WinUI 3 with a fully custom, non-Fluent interface. No subscriptions, no cloud uploads.

Custom UXPDF MergeOfflineFree
Get it from Microsoft

Fluent vs. custom UX

We know the rules.
We also know how to break them.

From strict Fluent adherence to deeply custom architectural designs — examples of what's possible on the Windows platform.

ModernHEIC Converter
Strict Fluent Design

ModernHEIC Converter

Built with perfect adherence to Windows 11 guidelines. Utilizes standard Mica materials and native API integrations — the platform at its purest.

Microsoft Store ›
ModernWebP Converter
Win2D Rendering

ModernWebP Converter

A complete override of default ControlTemplates. Advanced image processing wrapped in a bespoke, non-Fluent shell built from scratch.

Microsoft Store ›
Sticky Notes Studio
Complex Canvas

Sticky Notes Studio

Bending the WinUI 3 framework to build an interactive 2D canvas — free-form drag, custom hit testing, and a UI that has no Fluent equivalent.

Microsoft Store ›

Tech stack

Powered by WinUI 3

We go deep on the Windows platform — using native tools to build entirely custom experiences, not cross-platform compromises.

WinUI 3
Modern Windows UI framework
Windows App SDK
Full native API access
XAML
Declarative, expressive layouts
C# / .NET
Robust, type-safe backend logic
Custom UI
Overriding defaults for better UX
MSIX Packaging
Store-ready deployment

Why hire us

We don't just write code.
We design for the platform.

01

WinUI 3 at the core

We build on Microsoft's modern UI framework — not wrappers, not Electron. Native performance, native integrations, native everything.

02

Custom UI, not Fluent defaults

We override control templates and craft layouts that go beyond what the design system allows. The result looks like nothing else on Windows.

03

Performance by design

Lightweight and responsive. We optimize render paths and keep resource footprint minimal — no unnecessary overhead.

04

Privacy without compromise

No telemetry beyond OS requirements. Your data stays on your machine. That's not a feature — it's the baseline.

Open for work

Need a custom Windows
UI developer?

I build high-performance Windows applications powered by WinUI 3, tailored UI components, and a sharp eye for boundary-pushing design. Let's build something great together.

Get in touch ›See my work