AppScore

Harald Stapfer AppScore

Software with gravity.

I engineer ideas into digital experiences: business apps, cross-platform apps, VR games for Meta Quest and AI‑related projects. Complete products, from the first idea to release.

Explore my work Get in touch
  • Since2010Software development
  • Since2020XR & VR development
  • Business app60+countries use it

01Selected work

Real products.
Shipped, used, in the making.

An immersive game coming soon to Meta Quest, a VR game already on the Meta Quest store, a business app in use around the world, and a tool for other Unity developers.

01XR · VR · Spatial computing

Coming soon · Meta Quest

Pull gravity out of thin air.

A hands-first VR puzzle game. Pinch the air, pull your hands apart, and a gravity field appears between them, strong enough to bend streams of glowing stardust into humming goals.

Gravisphere key art: a G-shaped orbit around a black field, with gold and cyan stardust drifting around it.

Level 4, Maw, on the game’s own physics: guide each stream past the black hole into its own planet. Drag to open a field, tap it to close it.

  • Hands onlyNo controllers, just a pinch.
  • No text, no tutorialEach level teaches the next.
  • Black holes, white holesGravity obstacles that link into wormholes.
  • Daily OrbitA new puzzle every day.

Unity 6C#Meta Interaction SDKHand trackingAI coding agents

Ask about Gravisphere

03Business app · Flutter · Firebase

A highly customizable business app

An app I developed that businesses tailor to the way they work, in use in over 60 countries.

Making an app this customizable is where engineering discipline shows: every business shapes it differently, and it still has to stay dependable, maintainable and clear for people in very different places.

FlutterCross-platformFirebase backend

Ask about this project

04Developer tool · Unity Asset Store

AuthPair

Pair-code sign-in with Firebase, for Unity apps on devices without a keyboard.

Typing a password in a VR headset is painful. With AuthPair the app shows a short pairing code. The user enters it on an authentication page on their phone or computer and signs in there, with providers like Google, Facebook, Microsoft or Twitter.

UnityC#Firebase AuthenticationRealtime Database

View on the Unity Asset Store (opens in a new tab) Documentation (opens in a new tab)

02About

Every new field
orbits the last one.

I'm Harald Stapfer, an independent software developer in Austria. I started AppScore in 2010 and have been building software professionally ever since.

In April 2020, when the lockdowns began, I saw what virtual reality could become and used the time to learn it properly. Since then I have combined it with a decade of software engineering to build VR games, interactive experiences and tools. None of it replaced what came before. Each step added a new orbit around the same core: turning ideas into software that works, and that people enjoy using.

  1. 2010

    App development

    Android apps, Google Apps Script automation, and professional .NET application development.

  2. 2019

    Cross-platform apps

    Flutter becomes my main focus: one codebase for apps on many platforms.

  3. 2020

    Into XR

    Since April 2020: VR games, interactive experiences and tools with Unity for Meta Quest.

  4. 2025

    Exploring AI

    AI-related projects and new ways of building software: Gravisphere is developed with AI coding agents that I direct and review.

03Expertise

One skill set,
four directions.

The technologies matter less than how they combine. Point at a project, or tap it, to see what went into it.

Software engineering

  • .NET
  • Application architecture
  • Full-stack development
  • Firebase

Cross-platform apps

  • Flutter
  • Mobile apps
  • Android · Java

XR & immersive

  • Unity
  • C#
  • Meta Quest
  • VR interaction & gameplay
  • Hand tracking
  • Spatial computing

AI & emerging tech Now

  • AI-related projects
  • AI coding agents
  • New tech in practical software

Projects

04Contact

Have an idea
worth building?

I'm interested in ambitious projects, collaborations and hard technical problems: mobile and business apps, immersive experiences, or something that doesn't fit a category yet. Tell me what you have in mind.

Email mail@appscore.at