AppScore

Harald Stapfer AppScore

Software with gravity.

I build complete products, from the first idea to release: business and cross-platform apps, VR and mixed-reality experiences for Meta Quest, and AI‑related projects.

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

Selected work

Built to be used.
Games, business apps and tools.

Five projects, from a hands-first puzzle game to a business app used in over 60 countries.

01XR puzzle game

Coming soon · Meta Quest & Meta VR Glasses

Pull gravity out of thin air.

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

Try level 4, Maw. Bend each stardust stream into the planet of its own color, around the black hole where the streams would cross.

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

A browser sketch on the game’s own physics, not the game itself. In Gravisphere you open fields with your hands, in VR or in your own room.

  • Hands onlyNo controllers, just a pinch.
  • Learn by playingNo text, no tutorial: each 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

03Mixed-reality framework · Meta Quest

Available on Meta Quest

Turn a spreadsheet into a mixed-reality experience.

A framework for showrooms, product presentations, training scenarios and simple games, built without coding. Place furniture in your own room before you buy it, or prototype an idea.

UnityMixed realityHand trackingFirebaseSpreadsheet-driven contentWeb dashboard

Discover Relize (opens in a new tab) Get it on Meta Quest (opens in a new tab)
Relize in mixed reality: a virtual dining table, chairs and lamps placed in a real living room. Watch the Relize video (opens YouTube in a new tab)
A virtual armchair with a yellow cushion placed by a real window in mixed reality.
Relize demo rooms floating in a real room: product presentation and a chess board for prototyping and gaming.

04Business app · Flutter · Firebase

ReForm

A highly customizable business app that companies 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 ReForm

05Developer 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 or Microsoft.

UnityC#Firebase AuthenticationRealtime Database

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

About

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. In December 2023 my team won at Meta’s Presence Platform Hackathon in London.

  4. 2025 – now

    Building with AI

    AI-related projects, and AI coding agents in my own development: the agents write and test the code, I set the direction, review and decide. Gravisphere is built this way.

Expertise

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

XR & immersive

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

AI & emerging tech Now

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

Projects

Training

Agentic XR Development · Kickoff workshop

A playable
XR prototype
in one day.

Gravisphere went from first commit to a full XR game in four weeks: one developer, directing AI coding agents.

Learn the way I built it: give AI agents a harness to build and test XR on their own, then keep direction, review and decisions in your hands.

For solo developers, small teams and non-developers who want to build XR games and apps for Meta Quest with agents.

  • One day
  • On request
  • Remote
  • In German
  • Your own idea
Request the workshop

The day

  1. Set up the harnessEverything the agents need to work on their own: the Unity project, rules they follow, the Meta XR Simulator, Meta XR Operator and Meta’s XR agent skills.
  2. Cut your idea into tasksSmall slices an agent can finish and you can check.
  3. Run the agentic loopThe agent writes the code, tests it, reviews the result and fixes what fails, round after round, before you see it.
  4. Let the agent test in XRIt runs the prototype itself, pinching, poking and grabbing with synthetic hands.
  5. Play your prototypeBy the end of the day a first playable prototype, with you deciding scope and quality all along.

UnityMeta XR SimulatorMeta XR OperatorMeta XR agent skillsAI coding agents

Contact

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