Apps that turn customers into regulars.
As an app agency from Hamburg, we build shopping apps for iOS and Android
– for brands that want more than a mobile browser tab.
The Hagel app after our relaunch
- stars in the App Store
- 1.3 → 4.8
- of revenue through the app after the first year
- ≈ 20%
- usage since the relaunch
- +300%
Everything a successful native e-commerce app needs.
App Audit
App Design
Backend Integration- App Development
Migration
Push & Loyalty
Tracking & Analytics- Operations & Maintenance
Your customers live on their phones.
Your brand doesn't yet.
Channel dependencyYour web shop is your only channel
When ads get more expensive or Google changes its rankings, you have no plan B.
- → No direct line to your customers
Performance gapYour app runs. Just not smoothly.
You grew fast – now the tech is blocking the next step.
- → Technical debt
- → Integration chaos
Too little retentionInstalled, opened once, forgotten
People download the app, take a quick look, and never come back.
- → No loyalty mechanics, no reason to return
Silence in the storeNobody finds you in the App Store
Few reviews, average ratings, no plan for the store listing. Organic downloads don't happen.
- → Hardly any reviews, rating below 4.5
Not just an app.
Your strongest sales channel.
With these features, your customers come back – and buy more often.
Turn buyers into
regular customers.
A loyalty program built right into the app.
Collect points, move up tiers, unlock exclusive
rewards.
See it before you buy it.
Augmented reality puts your products in the
living room. AR cuts returns, builds
purchase confidence and offers an experience no
web shop can match.
Right on your customers'
lock screen.
Push notifications are your strongest
re-engagement tool. Segmented, personalized and with conversion rates email marketing can only dream of.
Every customer sees
the app that fits them.
AI-powered product recommendations, personalized
home screens and individual offers – based
on purchase and browsing behavior.
The difference shows in the App Store.
The people who use an app decide whether it delivers. For Hagel, the verdict is clear.
Flutter
- E-Commerce
- Flutter App Development
- Shopify Headless
An app relaunch that can be measured:
From 1.3 to 4.8 stars
Hagel is one of the largest providers of haircare and salon supplies in Germany. Together, we completely reimagined their existing shopping app: designed in workshops, developed in Flutter, and launched right on schedule.
View caseWe integrate what your business needs.
Your app connects to your existing store system and tools.
- Shopify
- Google Analytics
- Firebase
- Magento
- New Relic
- Klaviyo
- RevenueCat
- Sanity
- Stripe
Shopify integration, technology and costs
Shopping app for Shopify
Your own app or a builder like Tapcart? What an app does for your Shopify store and when it pays off.
More on Shopify appsFlutter development
One app for iPhone and Android from one project: why we use Flutter for it and what you get out of it.
More on FlutterIs an app worth it?
Which stores an app pays off for, what it costs and how many repeat customers you need before it carries itself.
Read the article
From MVP to bestseller
The first step: a free initial consultation. Together, we will discuss your goals, challenges, and expectations, define the framework, and develop clear approaches to help your platform grow sustainably.
01 Discovery
- Analysis of market, competition, and target group
- Identification of potentials in conversion, retention, and scalability
- Understanding of your technical infrastructure and challenges
02 Strategy
- Development of an action plan for the MVP
- Prioritization of features that deliver fast and sustainable impact
- Strategic alignment of design, technology, and business goals
03 Execution
- First version of your app after 4 to 6 weeks
- Implementation of the MVP with a focus on conversion and customer retention
- Integration of sales-promoting features such as cross-selling and upselling
- Ensuring high technical and visual quality
04 Launch
- Technical foundation that scales with your goals
- Go-live of the MVP with a focus on user feedback and KPIs
- Initial performance validation to prioritize next steps
Growth Cycles
Growth comes from continuous, structured work. Our Growth Cycles ensure that your app is constantly evolving.
Build, test, optimize
Every month, concrete measures get shipped — features built, tests launched, conversion improved.
What awaits you from day 1
Expert Team
An experienced team of strategy, development, design, and QA.
Transparent reporting
Full insight into progress, results, and next steps.
Modern Tech Stack
Automated workflows, AI-powered tools, and modern tracking.
Partner Space
Your central hub for roadmap, project management, and knowledge base.
Direct communication
Direct line to the team via a dedicated Slack channel.
Quality & Results
Structured testing, automated releases, and continuous monitoring.
Book your 30-minute initial consultation now.
The first step to more growth
"Are you planning an app, or is your existing one not running smoothly? Book a slot – we'll take a look and clarify if we can help." – Eric Schlottke, Co-Founder of muun
The Q&A game
You have some really good questions, and we have found the answers to them. Your question is not there? Scroll up and get in touch with Eric!
How much does an app for our online store cost?
Mainly it depends on the features, on how many systems the app has to connect to, and on whether it replaces an existing app. In a free initial call we look at your requirements and estimate effort, budget and timeline. Which running costs to expect is covered in our article A mobile app for your online store: when it pays off.
How long does it take to develop an app?
A first version of your app is ready after 4 to 6 weeks. How long it takes until launch in the store depends on the features and on how many systems need to be connected. In the initial call we look at your requirements and give you a realistic estimate.
When is your own app worth it?
In our experience an app pays for itself from about 3,000 active repeat customers. Below that, an optimized mobile store is usually the better investment. Other good signs: your customers order at least three times a year, a large share of revenue already comes from smartphones, and you regularly run launches, promotions or a loyalty program.
Does the app work with our existing store?
Yes. The app uses products, stock, customer accounts and orders straight from your store, and with Shopify the checkout keeps running through Shopify. What your own app does for a Shopify store and how it differs from builders like Tapcart is explained on our page Shopping app for Shopify.
Which technology do you use?
Mostly Flutter. The iPhone and Android apps come from one project, which saves time and budget. Which technology fits your project is something we clarify in the initial call.
Does muun also support the app after the launch?
Yes. We also support our customers after the launch with continuous development, maintenance, and optimization. Whether it's new features, performance improvements, or adaptations to new requirements – we ensure that your app remains successful in the long term and grows with your company.