Custom Web & Mobile App Development
From responsive web apps to cross-platform mobile experiences, SemeLabs builds pixel-perfect, high-performance applications. One team handles product design, engineering, and deployment — using React, Next.js, React Native, and Node.js — so nothing gets lost between agencies.
What we build
- React, Next.js, and full-stack web applications
- React Native and cross-platform mobile apps
- E-commerce and marketplace platforms
- Real-time features: chat, notifications, live data
- Progressive Web Apps (PWA)
- Integrations with payment, CRM, and AI/LLM services
How we work
Every project starts with product scoping: we map user flows, define the MVP cut-line, and agree on measurable milestones. You get a working build early and see progress in weekly demos.
We ship with TypeScript end to end, automated testing, and CI/CD on GitHub Actions — so releases stay fast and safe after launch, whether we continue as your product team or hand off to yours.
Frequently Asked Questions
Do you build both the web and mobile versions of an app?
Yes. We build web apps with React and Next.js and mobile apps with React Native, sharing business logic and design language across platforms to cut cost and keep the experience consistent.
Can you take over an existing codebase?
Yes. We start with a technical audit, stabilize the highest-risk areas, and then ship features on a agreed roadmap. Many of our engagements are rescues or extensions of existing products.
How much does a custom app cost?
Scope drives cost: a focused web MVP starts smaller than a multi-platform product with real-time features. After a free scoping call we provide a fixed quote with milestones — no open-ended hourly surprises.
Ready to build?
Tell us about your project and we'll get back to you within 24 hours.
Get in touch