TwentyThree Labs engineers polished, high-performance mobile experiences for Android and iOS — from concept to App Store.
What We Do
Everything you need to ship a world-class mobile app, under one roof.
Native Kotlin apps with Material You design and Jetpack Compose. Google Play-ready from day one.
Beautiful Swift and SwiftUI apps built to Apple's Human Interface Guidelines, from iPhone to iPad.
Flutter and React Native for near-native performance on both platforms without doubling your budget.
From wireframes to interactive prototypes. Intuitive flows that convert and retain users.
Scalable REST and GraphQL backends, real-time features, push notifications and secure authentication.
Submission, review management, ASO and post-launch monitoring so your release goes smoothly.
How We Work
No black boxes — a clear path from idea to launch.
We dive into your goals, users, and market to understand the problem worth solving.
Wireframes, prototypes, and high-fidelity mockups tested with real users before any production code.
Agile sprints with clear milestones, CI/CD pipelines, and a staging environment you can access anytime.
Store submission, phased rollouts, analytics setup, and ongoing post-launch support.
Why TwentyThree Labs
We're a focused studio — mobile apps are the only thing we do, which means we do them extraordinarily well.
Weekly updates, shared Notion boards, and direct Slack access to your engineer.
Built under German law — every app ships with privacy-first architecture compliant with EU regulations.
Fixed-scope projects with milestone-based billing. No surprise overruns at month end.
We maintain apps after launch and grow alongside your product — we don't disappear after go-live.
Tech Stack
We pick the right technology for the job — not the trendiest one.
Get in Touch
Tell us about your project and we'll get back to you within one business day.
Or email us at hello@twentythreelabs.io