Services · App Development

Apps for mobile and desktop.

Native and cross-platform apps for iOS and Android — and desktop apps for macOS and Windows. Thought through in UX and design, strong in performance.

iOS
Android
macOS
Windows

01 · Services

From the idea to the store.

We guide your app from the first sketch to release — and beyond.

iOS · macOS · Windows

Native & desktop apps

Native apps for iPhone and iPad in Swift, desktop apps for macOS and Windows with Electron — fast and fluid to use.

iOS & Android

Cross-platform

One codebase for both platforms with Flutter or Ionic — when reach and budget matter.

Backend

Middleware & interfaces

APIs, push notifications and real-time synchronization with your online store, ERP or CRM.

AI in the app

Image generation, assistants and automation right inside the app — where they make everyday work easier.

02 · Process

Five steps to the finished app.

01
Concept
Clarify goals, audience and feature scope. The result is a plan with priorities and effort.
02
UX & design
Flows and screens as a clickable prototype — testable before the first line of code is written.
03
Development
Built in short stages with regular test versions on your device.
04
Test & release
Tests on real devices, submission to the App Store and Google Play.
05
Operation
Updates, new features and adjustments for new operating system versions.

03 · Insights

Apps from our workshop.

Five apps from our work — for LANAKILA, as our own product and as a private project — with a look at their concept and screens.

01 · Sportswear · Logistics

LANAKILA Birdy

We built Birdy for LANAKILA, the Leipzig sports brand of Sylvia Michalk. The app brings together what used to be spread across several online stores, phone calls and WhatsApp threads: orders, inventory, suppliers and pickups — in a native iOS app with middleware. Each role sees only its own tasks, push notifications replace ad-hoc coordination, and a QR scan keeps inventory in the online store up to date. Birdy is in daily use at LANAKILA.

View the case study: Birdy – one app instead of five workarounds →

Native iOS app
Middleware
Push notifications
QR scanner
Omnichannel

Platform: iPhone
Technology: Native iOS · Middleware
Roles: Production · Courier · Warehouse · Management

The middleware

Online store integration: Secured API connections to all online stores: orders, inventory and delivery status are available in one place.
Warehouse management: Multiple warehouse locations with contacts and inventory per item and variant.
Suppliers & bills of materials: Suppliers, their contacts and products, and the bills of materials for the company’s own items are maintained centrally.
Users & roles: Team, producers and couriers are given roles and permissions — the app shows only what belongs to each role.
QR codes and barcodes: A unique, print-ready code is generated automatically for every item and every variant.
Targeted notifications: The middleware decides which push notification goes to whom — instead of messages to everyone.
Complete history: From incoming order through production, release for pickup and shipping to the updated inventory, every step can be traced.

The app

Smart filter: Orders from all stores are brought together; producers see only the line items they manufacture.
Courier pickup: When an order is finished, the courier receives a push notification with the address; the status is updated on pickup.
Shipping status: The shipping status in the online store can be changed right from the app — without logging in to the store backend.
Delivery notes: Producer and warehouse print delivery notes from the app.
Scanner: A scan at a trade-show sale or on goods receipt updates inventory in the online store; stocktaking is done by smartphone.

Why native

Face ID sign-in: Credentials are kept in the keychain — no hunting for the address and password.
Camera and scanner: Direct access to the camera for QR codes and barcodes, without a detour through the browser.
Push on the lock screen: Notifications arrive even when the app is closed.
Contacts: Call or message a contact right from the app.

Planned

Prototype photos: Photograph test prints and prototypes right in the app and send them for approval.
AI agent for reordering: Automatic reordering of materials, with a price comparison beforehand.
Management dashboard: Overview with real-time key figures.
Android: Expansion to Android.

7 Views

02 · Sportswear · E-commerce

LANAKILA Shopping App

The native shopping app for LANAKILA Sports on iPhone and iPad: catalog, wishlist, cart and checkout — plus the LANAKILA Designer for designing and ordering jerseys right inside the app. With their Lanakila Racers access, athletes upload photos and videos directly from the app. Data exchange with the store runs through a purpose-built middleware. The app is currently (10/2026) in Apple’s TestFlight phase; an Android version is planned. Built for LANAKILA, the sports brand of Sylvia Michalk.

View the case study: LANAKILA Shopping App →

Native iOS app
iPhone & iPad
SwiftUI
Custom middleware
Apple Pay
Push notifications

Platform: iPhone · iPad
Technology: SwiftUI · custom middleware
Status: TestFlight (10/2026)

Features

Catalog & search: Full-text search, categories and filters. Content that has already been loaded appears instantly and is refreshed in the background.
Wishlist with alerts: Saved products are stored permanently. When a price drops or a sold-out variant is back, a push notification arrives.
Size assistant: Enter your body measurements once in the app — they stay on the device. Every product then comes with a personal size recommendation.
LANAKILA Designer: Design your own jersey: tap a part, pick a color, check front and back, zoom — and order your design right away.
Custom design for teams: Inquiry form for clubs and teams with up to ten inspiration images — from the first sketch to the finished outfit.
Team configurator: The existing configurator for team jerseys is embedded in the app and hands the configuration over to the cart.
Account & sign-in: Sign in with Face ID or Touch ID, passwords in iCloud Keychain, guest checkout, and account deletion right in the app.
Cart & checkout: The cart survives an app restart. Checkout with the mandatory information customary in Germany, and Apple Pay.
Push notifications: For order status, wishlist items back in stock and promotions. One tap leads straight to the right product.
Newsletter & stories: Newsletter sign-up, an archive of all issues and blog posts — rendered natively instead of as an embedded web page.
Sharing photos & videos: With Lanakila Racers access, photos and videos can be uploaded directly from the app. Your own upload history is also available offline.
Lanakila Racers: Community section with athletes’ stories, a gallery and the application for the team.

Technology & privacy

Custom middleware: The app does not talk to WooCommerce directly: a purpose-built middleware mediates between app and store.
Fast, even offline: Multi-level caching keeps catalog and product pages quick; recently viewed products remain available offline.
No tracking SDKs: The app works without third-party analytics or advertising SDKs. Credentials and body measurements are protected in the device keychain.
Accessibility: Supports Dynamic Type, VoiceOver, contrast guided by the WCAG guidelines and the “Reduce Motion” setting.

Planned

LANAKILA Miles: Integration of the Lanakila loyalty program: collect loyalty points.
LANAKILA Events: Sign up for group rides with the Lanakila Racers team — right in the app.
Android: The app is also set to be released for Android.

33 Views

03 · Sportswear · Community

LANAKILA Media App

With LANAKILA Media, athletes send photos and videos straight from their iPhone or iPad to the team at LANAKILA SPORTS — without an account, even when a video is 3 GB in size. The upload continues in the background and, after an interruption, resumes where it left off. Every submission is first reviewed by a person on the team; for each file the app shows whether it is under review, approved or not used. Built for LANAKILA, the sports brand of Sylvia Michalk.

View the case study: LANAKILA Media App →

Native iOS app
iPhone & iPad
SwiftUI
Background upload
No account
No analytics tools

Platform: iPhone · iPad (iOS 17+)
Technology: Swift · SwiftUI · custom middleware · S3 Garage
Status: TestFlight (10/2026)

For senders

One button: Tap the big circle, pick photos and videos — the upload starts right away.
No account: Name, email address and consent are entered once during setup, and never again.
Large files: Photos (JPG, PNG, HEIC) and videos (MP4, MOV) up to 3 GB per file, up to 500 files at once.
Background upload: The upload keeps running when the iPhone is locked or you switch apps.
Resume instead of restart: Large videos are transferred in parts. If the connection drops, it continues from the same point.
Status of every submission: Under “Sent”, each file shows whether it is under review, approved or not used. An approval arrives as a notification, receipt is confirmed by email.
Already sent?: If a file that was already sent is selected again, the app asks first — so nothing ends up in the pool twice.
Invitation links: For campaigns and events: the link opens the app directly and shows what you are sending for and how much quota is left.
Help: Short expandable topics, reachable from every screen.

For the team: the media pool

Review on the go: Anyone who signs in with their middleware access sees an additional “Pool” tab with all submissions.
Filter and search: By New, Approved, Rejected or All, photos only or videos only; search by name, email address and note.
Decide: Approve, reject, download the original or delete — deliberately only in the detail view, not while scrolling past.
Notify: An approval sends the sender a notification; new submissions appear in the list on their own.
Protected: When you leave the app, Face ID locks the pool. The app stores no password, only a token in the keychain.

Privacy

No access to the photo library: The app uses the iOS photo picker and sees only what is selected.
Consent in full wording: The text, with its version number, is shown during setup and at any time under “You”. If it changes, the app asks again; it can be withdrawn with a switch.
Review first, then use: Nothing is published automatically: every submission is first reviewed by a person on the team.
No ads or analytics: No advertising, no third-party analytics tools, no in-app purchases.

Technology

Swift and SwiftUI: Built natively, without third-party libraries.
Own object storage: S3 Garage: An S3-compatible object store (Garage) was set up on a dedicated server specifically for this app — the files stay within the company’s own infrastructure.
Straight to storage: Files go directly to object storage via time-limited addresses and never pass through the web server.
Custom middleware: The middleware issues the upload addresses, manages the submissions and controls approvals and notifications.
Controlled by the server: Limits, formats, consent and privacy texts come from the server and can be changed without an app update.
Abuse protection: A computational puzzle in the background replaces the captcha for guests without an invitation.
One way into the media pool: The app uses the same interfaces as the upload page in the browser.

12 Views

04 · Fitness · Kids

MaxxLevel App

MaxxLevel is a private project: René Mattis designed and built the app together with his son. MaxxLevel is a fitness app for kids: set up a weekly plan, check things off every day, see what you have achieved. The app reports what is coming up and what has been done — never what was missed: no reminders that nag, no red days, and a silent joker per week keeps the streak going. It works without an account, without a server of its own and without tracking; the data stays on the device and in the private iCloud area.

View the case study: MaxxLevel →Website and TestFlight beta (in German) ↗

Native iOS app
SwiftUI
SwiftData
Widgets
iCloud
No account

Platform: iPhone · iPad (iOS 17+)
Technology: SwiftUI · SwiftData · CloudKit
Data: Local · iCloud, no server
Status: Beta via TestFlight, before the App Store launch

Training

Weekly plan: Define for each weekday which exercise is due and how often — with a start date and the option to carry the plan over to the following weeks. A day can be copied to other days.
Templates and assistant: Ready-made plans such as “Beginner” or “Strength at home” to adapt; or answer two short questions and get a plan suggested.
Today: A progress ring and one card per exercise: check off set by set. Two out of three sets count too.
Next level: The plan grows in small steps: a few more repetitions per set, or one more set.
Exercises: 16 exercises come preinstalled; custom ones can be added with unit, category and symbol.

Seeing progress

Streak with joker: The streak counts consecutive days. One joker per week silently covers a missed day; rest days do not break it.
History: The last 16 weeks as a calendar view, plus every week with its days in detail. Missed days are gray, never red.
Analysis: Completed sessions per week, totals and the completion rate per weekday — the strongest day is highlighted.
Records and badges: Personal bests per exercise and badges for milestones. Badges are awarded and never taken away.
Cards to share: Week, records and analysis as an image to send on.

Crew

Celebrating together: In a crew with friends, the others’ streaks, new levels and records show up. There is no leaderboard.
A shared goal: The crew sets itself a goal, such as 1,000 push-ups together, and sees the progress.
Cheering instead of chatting: Three symbols for cheering — no messages, no photos. Only nickname, symbol and color are visible.
Parents have a say: Before joining for the first time, a parent step shows what is shared and asks for consent.

Reminders without pressure

Notifications: In the morning, what is coming up; after the last set, praise; on Sundays, the weekly review. Two a day at most — and none about missed days or streaks at risk.
Check off from the notification: “Done” right in the notification, without opening the app.
Widgets: Daily progress and streak on the home and lock screen; items can be checked off right in the widget.
Siri and Shortcuts: Report an exercise as done by voice command.

Technology & privacy

No account, no server: Everything is stored on the device and synced through the private iCloud area. The app also works entirely without iCloud.
Backup: Plans, exercises and history can be exported as a file and imported again.
Apple Health: If desired, completed days appear as workouts in Apple Health.
Plan and history kept apart: When the plan changes, the past stays as it was: the history stores what actually applied on that day.
Appearance: Light and dark, two accent colors, large text — built with SwiftUI, Swift Charts and WidgetKit.

35 Views

05 · AI · Desktop app

RENEKI AI Image Generation

RENEKI is a vona desktop app for macOS and Windows, built for LANAKILA, that lets teams turn product photos into new image motifs: pick a design and reference images, build the prompt from one-click blocks, choose a model — and the AI image is ready, with tokens and cost. Projects can be shared with the team, results sent by email or assigned straight to a shop product. Everything is managed centrally in a web app of its own: users and permissions, providers and models, prompt blocks, tracking and push messages. The desktop app works locally and stays usable without a connection to the server.

View the case study: RENEKI →

RENEKI is also available for your company: we set it up and, if you like, adapt it to your team, your image models and your shop.

Ask about RENEKI

Desktop app
macOS & Windows
Electron
React
AI image generation
Web administration

Platform: macOS · Windows
Technology: Electron · React · SQLite · PHP backend
AI connection: Google AI Studio (Nano Banana and other Gemini image models)
Status: In production since 06/2026

The desktop app

Projects and gallery: Every job belongs to a project with its own images and history. The gallery filters by provider, model, period and size and shows model, tokens and cost for each image.
Prompt builder: Combine camera, light, style, background, atmosphere and more with a click, plus your own instructions and saved templates.
Reference images: Main image and up to eight references via drag & drop — or straight from the shop or an image generated earlier. Oversized images are flagged.
Image size and format: From 512 to 4096 pixels in common aspect ratios; a higher resolution can be generated afterwards.
Prompt library: Proven prompts with categories, tags, favorites and a usage counter; import and export as a file.
Next steps: Select several images and send them by email, export them, assign them to a WooCommerce product or move them to another project.
Comfort: German and English without a restart, light and dark mode, system notifications, backup of database and prompts.

Teamwork

Share projects: With one click a project is uploaded to the server as an immutable snapshot, images included.
Check out instead of overwrite: Colleagues import their own copy and carry on independently. Later changes to the original never overwrite it.
Central configuration: Prompt blocks, providers, models, shop and mail settings come from the server and are cached locally.
Permissions: Roles for users and administrators; assigning images to shop products is enabled per user and checked live.

The web app

Dashboard: Active users, generations, errors, token usage and cost at a glance.
Providers and models: Add providers and models or fetch them via API; prices can be synced from a public price database.
Prompt blocks: Categories and blocks for the prompt builder are maintained here and distributed to all apps.
Tracking: Every generation with user, project, model, settings, tokens and cost — filterable by user, date and status. Plus a log of all sign-ins including the device.
Shared projects: All shared projects with preview, prompts and cost per generation.
Releases and shops: App versions for macOS and Windows, WordPress/WooCommerce sites and mail settings.

Push notifications

Message to the team: Administrators write a message in the web app to all users or selected ones.
No push service of its own: The app asks the server every 30 seconds, shows a badge and triggers a system notification.
Read status: The app reports back that the message arrived — the administrator sees who received it.

Technology & security

Local-first: Images, history and prompts are stored locally in SQLite; the app works offline for your own work.
Keys stay local: API keys and mail credentials live in the operating system keychain and are never sent to the server.
Strict process separation: The interface has no access to the file system or network; everything goes through a defined interface in the main process.
Cost calculated server-side: The backend calculates the cost of each generation from the stored model prices.
Extensible: New providers can be added through a uniform provider interface without changing the rest of the app.

21 Views