App agency in Upper Austria
AppJoy is an app and web development agency based in Peterskirchen, Upper Austria, founded by Tobias Wimmer. We build custom iOS, Android and web apps for startups and established companies in Austria and the rest of Europe.
What we build
- Mobile apps for iOS and Android with Flutter, React Native and Expo, or fully native in Swift and Kotlin.
- Web applications with Next.js, TypeScript and Tailwind CSS.
- Backends in Go with PostgreSQL, or in Payload CMS with MongoDB when content management is central.
- APIs defined contract-first in OpenAPI, plus integrations such as Stripe, Firebase, Google Maps and Bluetooth Low Energy.
How we work
One person owns your project from the first conversation to the release. There is no handover between sales, project management and developers.
The price is fixed and agreed before work starts. Every client also gets access to the AppJoy Platform, where you can see and change the current state of your app at any time.
Price and timeline
An AppJoy MVP starts at €12,000 and is delivered in 10 business days after scope and price are agreed. Larger products are scoped individually.
Projects from our portfolio
We have delivered a hotel booking platform for iOS, Android and web (HighratedHotels), a fitness app with celebrity voices (WhatDaFit), a parkour video app (HoldMyBeer), a digital construction log (Grifas) and our own fully native app Momento. The case studies list the technology behind each project.
Working with AppJoy
We are based in Upper Austria and work with clients across Austria and Europe. The first step is a free consultation, where we talk through your idea and what it would take to build it.
Frequently asked questions
Where is AppJoy based?
AppJoy e.U. is based in Peterskirchen, Upper Austria. It was founded by Tobias Wimmer, who has more than seven years of experience building apps.
What does an app from AppJoy cost?
An MVP starts at €12,000 and is delivered in 10 business days after scope and price are agreed. The price is fixed before work starts.
Do you build only apps, or also web applications?
Both. AppJoy builds iOS and Android apps, web applications and the backends behind them, for example HighratedHotels as one product on iOS, Android and web.
Which technology do you use?
The tech stack is chosen per project. Flutter is the default for mobile-first products, React Native with Expo suits products that share code with a website, and fully native Swift and Kotlin suit apps that depend on platform features.
Who will work on my project?
One person owns your project from the first conversation to the release, so you always have a single contact who knows the whole project.
Do you work with clients outside Upper Austria?
Yes. AppJoy works with clients across Austria and Europe. The first step is a free consultation.
Related: How much does app development cost in Austria? (2026 guide) · The AppJoy Principle: one person, one project, one fixed price · Flutter app development in Austria
Case studies: HighratedHotels · WhatDaFit · HoldMyBeer