Your app.
Built right.
Shipped fast.
We design and develop Flutter apps with Firebase backends, AI integrations, and zero compromise on privacy or quality.
What We Build
Everything your app needs,
nothing it doesn't.
End-to-end delivery from design to App Store — with compliance baked in from day one.
Flutter Apps
One codebase. iOS, Android, web, and desktop. High-performance UI, smooth animations, native feel — without the native overhead.
Backend & Firebase
Auth, Firestore, Cloud Functions, push notifications, and analytics — configured securely with production-grade Firebase Security Rules.
AI Integrations
Practical Gemini AI features that ship safely: rate limiting, content moderation, EU AI Act compliance, and transparent disclosure — built in.
Design & UX
Interfaces that users actually enjoy. Clean layouts, accessible components, and interaction design grounded in measurable outcomes.
Monetization
Subscription plans, one-time purchases, and affiliate systems — engineered for the App Store, Play Store, and EU consumer protection law.
Compliance by Default
GDPR, EU AI Act, App Store guidelines. Impressum, Privacy Policy, Terms of Service — legal pages written and included in every project.
Featured Work
Built and shipped
to the App Store.
A real product — designed, developed, and launched by KruxDev. From zero to production.
AI Wiki
An AI-powered nutrition knowledge base
We designed and built a full-stack mobile app that generates on-demand nutrition wiki articles using Google Gemini. The app handles anonymous and authenticated users, premium subscriptions, affiliate integrations, and strict GDPR compliance — all from a single Flutter codebase.
How We Work
From first conversation
to App Store approval.
Discovery
We align on scope, users, and success criteria before a single line of code is written.
Design
Figma prototypes that feel finished — accessibility, dark mode, and edge cases considered.
Development
Flutter + Firebase built for real users: clean architecture, testable code, production security.
Launch
App Store submission, review support, analytics setup, and handover documentation.
Tech Stack
Tools that scale
from MVP to millions.
About KruxDev
Independent. Opinionated.
Accountable.
KruxDev is a one-person app studio based in Frankfurt, Germany. No account managers. No hand-offs. You work directly with the developer who writes the code.
Every project is built with the same rigor we'd apply to our own products — clean architecture, real security, full compliance, and interfaces people actually want to use.
We believe privacy is a feature, not a checkbox. Every app ships with GDPR alignment, transparent AI disclosure, and legal documentation as standard — not as an upsell.
Have an app idea?
Let's build it.
Tell us what you're building. We'll be straight about what it takes, how long, and whether we're the right fit.
Get in touch