App Development Agency You know what your app costs. Before it gets built.
In 21 days you click through your app, before a single line of code is written. Then you get one fixed price for everything. Many clients come to us because their last agency cost more than planned.
Recognized for design, user experience and digital innovation
“The new design gave our conversion a 31% uplift.”
I always thought it would be about the code, but our users care much more about the design! It was more than worth it.
Read more on Google
SaschaGoogle reviewTranslated from German“Top service, top results”
From day one, working together was simply fun. Together we developed the design of an app for managing concert tickets, and our ideas and wishes were not only heard but actively taken up and developed further in a meaningful way. What we especially valued was that requirements weren't simply ticked off: whenever something wouldn't have been the best solution from a UX or product perspective, it was raised openly, honestly and always constructively – along with well-thought-out alternatives. The team really engaged with our project, contributed their own ideas and worked with us to create the best user experience for our customers. The feedback rounds were always constructive, the lines of communication short, and decisions could be made quickly. In the end, we not only got a modern, well-thought-out design for our ticket app that we are very happy with, but also a collaboration shaped by trust, transparency and real partnership. Everything ran reliably on schedule, and at all times we felt we were working on a solution together – not as client and service provider. That's exactly how you imagine working with an agency. ⭐️
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SophiaMarketing Manager, München Ticket GmbHTranslated from German“Professional collaboration as equals”
KNGURU developed the UI/UX design and the web app for us, and we are very happy with the result. The collaboration works excellently, both in regular online calls and in person on site. Together we discuss ideas, question processes and develop solutions that really fit the product in the end. We would especially like to highlight working with Vera and Louis. The chemistry is simply right – you can tell that they are not only strong professionally but truly understand our requirements and vision. Our own ideas are taken seriously, developed further together and implemented constructively. That creates the feeling of working on a product together rather than simply being client and service provider. Before KNGURU, we had worked with two other agencies and unfortunately did not have good experiences. That made us all the more pleasantly surprised by the transparent communication, the open collaboration and the fair pricing. You always know where you stand, there are no hidden surprises, and in our view the value for money is absolutely right. We look forward to continuing to work together and can recommend KNGURU to anyone looking for a reliable partner for modern UI/UX design and the development of high-quality applications.
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SteveManaging Director, nextGYM GmbHTranslated from German“Five years of strong and reliable collaboration”
Our collaboration with Knguru started around five years ago with the smartmove app and continues today, as the product is still developed. Knguru supports us with UX and UI design for new features and updates. They also designed and developed our new landing page, while the app itself was implemented by our team. What I appreciate most is that Knguru does more than simply turn requirements into designs. The team asks the right questions, challenges ideas when needed and often suggests improvements to the original concept. Their long term knowledge of the product and our goals makes discussing new topics much easier. Communication has always been straightforward and reliable. I can share feedback openly, decisions are explained clearly, and the team reacts well when priorities or requirements change. This has made the cooperation efficient and pleasant over the years. The quality of the work has remained consistently high. The designs are modern and polished, but usability comes first. This is especially important for smartmove, where users need a simple and intuitive way to book and use shared vehicles. The same approach was applied to the new landing page, which presents the product clearly. Considering the quality, experience and product knowledge Knguru brings to the project, I believe the value for money is fair. After five years, I see them as a dependable long term partner rather than simply an external design agency.
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MichaelCTO, smartmove“First-class collaboration with an exceptionally creative team”
We worked very intensively with Knguru in Q1 2026 on a concept for a new training platform in civil protection. The collaboration was excellent, and the Knguru team contributed a great many very good ideas of their own that went far beyond the scope of a UX design. I have never experienced such outstanding collaboration on a project with any other team, and I'm thrilled. I can recommend Knguru wholeheartedly and look forward to working together again.
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ChristianCEO, Civentis GmbHTranslated from German“His constructive feedback took our product to the next level.”
I worked with Louis on my project for about two months and I'm really very happy with him. I especially valued his open manner and his constructive feedback, based on his solid understanding of the market and of customers. I'd work with him again any time!
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MartinGoogle reviewTranslated from German“We had an app UI designed and were impressed by the visual quality and the quick turnaround.”
KNGURU also gave us valuable input on usability, logic and the design approach. Bottom line: highly recommended!
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GraceGoogle reviewTranslated from German“Easy collaboration with excellent design results”
We have been working with KNGURU since the beginning of the year and are delighted all round. Coordination is easy and fast, the team responds quickly to requests, is friendly throughout and always implements feedback promptly and carefully. We especially value their proactive thinking: KNGURU brings in its own creative suggestions but also implements stricter requirements consistently and reliably when needed. The design itself is lovingly thought through and always user-centered – which also goes down extremely well with our stakeholders, who are thrilled with the results. The designs of our portal have even become the model for our client's new digital style guide.
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PiaProduct Owner, HÄVG AGTranslated from German“One of the best agencies we have worked with”
- Very likeable and competent team - Very modern, high-quality designs, not only beautiful but also easy to use - Communication was fast, straightforward and always on equal footing - You can tell that KNGURU has a lot of experience with apps, websites and digital products - Clear processes and transparent collaboration - Highly recommended for UX/UI, web design and app development in Leipzig
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TobiasProduct Manager, OpenCloud GmbHTranslated from German“Top agency with a real feel for good design”
Working together is a real pleasure: you describe what you have in mind and get it back, only more beautiful and better thought through. Communication is fast and straightforward. On top of that comes a modern, well-thought-out design that not only looks good but also simply feels right to use. I have full confidence that Knguru always gets the best out of the requirements, and I look forward to the first drafts every time.
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GalynaProduct Owner, HÄVG AGTranslated from German“Very happy with the collaboration”
We are working with KNGURU Studios on the launch of our new platform and are very happy with the collaboration. We especially appreciate how they think for themselves. The team doesn't simply implement our specifications but brings in its own ideas and develops them further in a meaningful way. You can also tell how much effort and attention to detail goes into the designs. Communication is fast and transparent, and we always know where the project stands. Feedback is taken up and implemented quickly. We are very happy with the collaboration so far and can recommend KNGURU Studios to anyone.
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MarvinFounder & Managing Director, Academy of eSports GmbHTranslated from German“Professional collaboration with transparent communication”
Our new website is still being built, but so far we are very happy working with KNGURU. The team works professionally, understands our ideas and implements them very well. We especially appreciate the fast communication and the transparent way of working, which lets us follow the project's progress at any time.
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ErhanManaging Director, Academy of eSports GmbHTranslated from German
New app or existing software, we do both
Most companies come to us with an app that is already live. The others with an idea. Pick your path; both start with a free call.
Idea or concept
New app
You want an app built and want to know up front whether it will catch on. First the prototype in 21 days, then the app at a fixed price, then we help you get users.
- Prototype in 21 days, €5,490, fully credited
- App at a fixed price from €10,000
- 90 days to get your first users
Already live, needs to get better
Existing app or software
Your app is showing its age, your developer has left or your agency isn't delivering. We take over the code, modernize the interface and tech, and win your users back. No prototype needed, we start within days.
- Code takeover instead of a rebuild
- UX/UI redesign while the app stays live
- Design and dev team from €2,699 a month
Special casesDevelop your AI prototype furtherYour own software instead of subscriptionsJust get more users
60,000
users in DeepDays, our own app
How our own app went from 0 to 60,000 users.
DeepDays is our app for car events. Every euro spent on ads was our own. What worked there, we apply to your app.
Today
- 60,000
- registered users
- €1M+
- in ticket sales through the app
- 350+
- events
- 4.8 ★
- in both stores
How we did it
- 01PositioningEvery car meet in one app. One clear reason to download it.
- 02UX/UIEvent pages that sell. Tickets go straight into the wallet.
- 03Measured marketingAds per event in the local area, tracked all the way to the ticket sale.
How much does your app cost?
The more features your app needs, the higher the development costs usually are. That's why we start lean and expand later.
Fixed-price app development in 4 steps
With more than 200 projects and our own startup behind us, we know what it takes to build an app. Four steps, each with a fixed price. After each one, you decide whether to continue.
Prototype in 21 days
€5,490You click through your app before any code is written. Then the fixed price is set.
fully credited toward the build
More on the prototypeKeep building
from €10,000If you like the prototype, we build in fixed stages. You test the app yourself after each one.
Your finished app
includedLogin, payments, data privacy and both stores are included. The code and accounts are yours.
Get users
90 daysWe help you get your first users. That's how DeepDays reached 60,000.
Price after the free analysis
More on growth
Different types of apps
The right type of app depends on who uses it and where. We build all three, and in the expert call we tell you which one is worth it for you.
Before any type of app
Clickable prototype
You click through your app before any code is written. Then you know which app type you need and what it costs.
- Runs on
- your phone
- Duration
- 21 days
- Credited
- in full
- Price
- €5,490
Browser-based application
Web App
Web apps cost less to build and are a good fit for B2B applications and dashboards.
- Runs on
- any browser
- Good for
- B2B apps, dashboards
- Tech
- React
- Price
- from €10,000
iOS and Android application
Cross-Platform
Cross-platform apps are hard to tell apart from a native app. The advantage: iOS and Android share one codebase.
- Runs on
- iOS and Android
- Code
- one codebase for both
- Tech
- React Native, Flutter
- Push
- yes
- Price
- from €20,000
Separate for iOS and Android
Native App
We build native apps separately for iOS and Android. That pays off when your app needs deep access to the camera, sensors or system features.
- Runs on
- iOS and Android, separately
- Good for
- camera, sensors, devices
- Tech
- Swift, Kotlin
- Price
- from €30,000
Have an app built without it costing more than planned.
If you want to have an app built, you will probably compare several offers. Check each one for these four things, ours included.
- A price before the build
- After 21 days you click through your prototype. Then you get a fixed price for the whole app. The prototype costs €5,490 and is fully credited toward the build.
- A schedule you can see
- Depending on scope, development takes three to six months. Every two weeks you get a demo on your phone.
- Everything in your name
- Code, design and store accounts belong to you. You can continue with another team at any time.
- Help after launch
- An app in the store has no users yet. If you want, we win the first ones with you in the 90 days after launch.
Built for clients. In use today.
A Gold Stevie Award, 200,000 festival visitors, 4.4 stars on Google Play. Eight of over 200 projects, all live, every screen real. Two more we can name but not show.
See all projects

The platform for pet owners and pet professionals
With PetPlanner, pet owners find the right service providers near them, book appointments online and keep track of their pet's health data, appointments and key information at any time.
Energy that adapts to your life.
Clever-PV wanted more than just an app. They wanted to give households control over their energy. Our job: a UX and UI design that makes data clear, intuitive and easy to understand.
The app for everyone who loves cars and motorsport!
DeepDays is the app for car events, community voting and digital ticketing. From the first idea through UX/UI design to the technical build, we developed the product entirely ourselves and scaled it to over 50,000 users in a short time.- 200,000visitors

A festival that lets you play along.
For the Glücksgefühle Festival we built an app that gives 200,000 visitors interactive experiences, from ticketing and gamification to live communication. 

Cook together with your favorite creators
Scoops connects food creators with their community in a new way. Influencers share their recipes right in the app, and their followers unlock them with a subscription, cook along and become part of an active food community.
Manage thousands of vehicles at a glance
Smartmove needed a way to manage its vehicle pool efficiently. We built an intuitive interface with smart automation that's easy to understand in 10 seconds.
Recruiting software on autopilot
Recruiting is often chaotic and manual. With Funellab we built a platform that filters, organizes and matches applicants automatically.
Complex CAD workflows made simple and intuitive.
Mensch und Maschine specializes in CAD and BIM software. We built an intuitive solution that simplifies complex processes and makes it easy for teams to work together.- Confidential

For Red Bull Salzburg. That's all we can say.
Not every project can be shown. What we worked on for Red Bull Salzburg stays confidential. If you build with us, you can count on the same discretion. - Confidential

For Evergreen. And that stays between us.
What we did for Evergreen stays in-house. Here too, we can't show anything. If you build with us, you can count on the same discretion.
Cutting corners on development puts your profits at risk
Building with AI is fast today. It gets expensive when no one decides up front what's worth building, when payments and app stores are added as extras, and when no one brings in users after launch.
01
Decide before you build
In 21 days you click through your app's main flows and know whether it's worth building. That's how the Glücksgefühle Festival, with 200,000 visitors, got its prototype.
02
Fixed price all the way to the stores
Login, payments, stores and data privacy are part of the fixed price, not extras added later. Scoops sells subscriptions in its food app, Smartmove manages thousands of vehicles through the interface we built.
03
90 days to get users to stay
After launch, we work on positioning, UX/UI and measured marketing to get users active and paying. These three levers took DeepDays from zero to 60,000 users, and every euro spent on ads was our own.
How much does each feature cost?
The more features your app needs, the more it costs, of course. That's why we always recommend building the app as lean as possible first and expanding it later.
After the prototype, you get one fixed price for all your features. Until then, this rule of thumb helps.
Bookmarks / favorites
Save places, posts or conversations so you can easily get back to them later.
User profiles
Personalized profiles where users manage their information, activity and personal settings in one place.
Search and filters
Add powerful search and filter features to your app so content, places or users are easy to find.
Push notifications
Send automatic push notifications straight to your users' phones and keep them active in your app with updates, reminders or new content.
Interactive map
Add a map to your app so users can easily share live locations and fixed places.
Events & RSVPs
Create, discover and respond to events right in the app.
Activity feed
A real-time live feed for your app where users discover new content, interactions and activity from their community.
Event features
Add event features to your app so users can create and discover events and manage their attendance directly.
App development with React Native and cloud technologies.
We build apps with the latest technologies to make sure your app can handle large numbers of users.
- Front-end
- React NativeReactNext.JS
- Back-end & Infrastructure
- FirebaseNode.JSSupabaseRailway
- Integrations
- RevenueCatStripeGoogle APIsGithub
- Design & Prototyping
- FigmaFigJamIllustratorAfter Effects
- AI Integrations
- GeminiClaudeChatGPT
Frequently asked questions about app development
How much does it cost to have an app developed?
With us, a web app starts at €10,000, a cross-platform app for iOS and Android at €20,000 and a native app at €30,000. The exact cost of your app depends on its features. After the prototype, you get a fixed price for it.
How long does it take to have an app developed?
The prototype is ready after 21 days. After that, development takes three to six months, depending on scope. You get the exact schedule on day 21, together with the fixed price.
How does it work if I want you to develop my app?
First we talk about your idea in a free call. After 21 days you click through your prototype and get the fixed price for the app. Then we build it in fixed stages and bring it to both stores. If you want, we then win the first users with you.
Why do you start with a prototype?
With the prototype, you click through your app after 21 days, before a single line of code is written. That way you see whether the app works the way you imagine it. It costs €5,490 and is fully credited when we build the app afterwards.
Web app, cross-platform or native app: what do I need?
A web app runs in the browser and costs the least. A cross-platform app reaches both stores from one codebase and is enough for most apps. We build native apps separately for iOS and Android when your app needs deep access to the device. In the first call, we tell you what fits your idea.
Can you keep developing an existing app?
Yes. We take over existing apps and software, including prototypes built with AI, and develop them into an app that runs reliably with many users.
Who owns the code and design?
You do. Code, design and all accounts are in your name. You can continue with another team at any time.
What happens after launch?
If you want, we help you get your first users in the 90 days after launch. We learned how with our own app, DeepDays.
Book your free call.
We look at your plans with you as if they were our own. If the build isn't worth it, we'll tell you, even if that means no project.
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