Mobile app development in the USA. Build mobile app for business. Company that makes apps in Greenwich, CT. iOS Android app USA. Enterprise app development. React Native Flutter USA. Custom mobile applications. How much does a mobile app cost in the USA. Mobile software development. Apps for restaurants, delivery, fintech, health, education USA.
Custom Mobile Apps · iOS & Android

Your business in everycustomer's pocket.Every single day.

Your customers spend 4.5 hours daily in apps — not browsers. Every day without an app is a day your competitors capture them first. We design and launch youriOS + Androidapplication with payments, push notifications, and a native experience that retains and converts.From $8,000 USD · Free quote in 24h.

iOS
Android
One codebase, two platforms, zero excuses

✓ Team in the USA · ✓ Senior developers · ✓ Store publishing included · ✓ Post-launch support

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89%

higher retention than a website — your customers come back on their own

4.8★

average rating on App Store and Play Store across our apps

3.2x

more purchases per user vs mobile browser — sales that multiply

<2s

load time per screen — fluidity that retains users

The question you should ask yourself today

While you read this, your customers are opening apps.Is yours missing?

78% of consumers in North America prefer buying from an app. Not from a browser. Not from Instagram. From an app with your brand, your cart, your notifications. Every week without an app is money left on the table — and customers going to whoever has one.

  • Your brand installed 24/7 on the home screen — always visible, always accessible
  • Push notifications with 5x higher open rate than email — recover inactive customers instantly
  • Native speed that outperforms any mobile website — more fluidity, more conversion
  • Direct access to camera, GPS, biometrics, and NFC — experiences impossible in a browser
Customer using a mobile application developed by NixMar Studio

Included Features

Everything your app needs to convert

Push Notifications

Keep your customers informed with real-time alerts about orders, offers, and news. Smart segmentation included.

5x higher open rate than email
PCI DSS

Integrated Payments

Stripe, PayPal, and local gateways. Customers buy in 3 taps without leaving the app. PCI DSS compliant.

Geolocation

Find stores, track orders in real time, or connect location-based services.

Real-Time Chat

Direct communication between users, customers, and support within your own platform. No third-party dependency.

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A
F

Social Integration

Login with Google/Apple/Facebook, content sharing, and organic virality integrated into every flow.

Enterprise Security

End-to-end encryption, biometric authentication (Face ID / fingerprint), and compliance with international standards.

End-to-end encryptionFace ID / FingerprintOWASP Top 10

Industries we serve

Apps for every type of business in the USA

No matter your industry — we have designed and developed apps that solve the specific problems of each sector. From delivery to fintech, we adapt technology to your business model.

NixMar Studio team designing mobile app prototypes with post-its and wireframes

E-Commerce & Retail

Store apps, catalogs, cart, and in-app payments. Increase your average ticket by 40%.

Delivery & Logistics

Real-time tracking, status notifications, and optimized routes for your drivers.

Fintech & Banking

Payment apps, digital wallets, and investment platforms with banking-grade security.

Health & Wellness

Telemedicine, appointments, patient tracking, and wearable integrations.

Education & E-Learning

Offline courses, gamification, student progress, and class notifications.

Restaurants & Food

Digital menus, reservations, takeout orders, and loyalty programs.

Our Process

From idea to App Store in 18 weeks

Agile methodology with full visibility. You participate in every decision.

Discovery & Strategy

Wk 1–2

We understand your business model, analyze your competition, define target users, and map your app's key flows.

UX/UI Design

Wk 3–5

Wireframes, interactive Figma prototypes, and a complete design system adapted to iOS and Android guidelines.

Agile Development

Wk 6–14

2-week sprints with Friday demos. You see progress in real time and prioritize features.

QA & Testing

Wk 15–16

Automated + manual testing on real devices. Edge case coverage, performance, and security.

Publishing & ASO

Wk 17–18

Upload to App Store and Google Play with listing optimization (ASO). Analytics and crash reporting setup.

Native App vs Mobile Website

Why choose an app over a website?

FeatureNative AppMobile Web
Load time< 2 seconds3–6 seconds
Offline accessYes, cached contentLimited (PWA)
Push notificationsNative, high conversionLimited, low open rate
Camera/GPS accessNative and fluidWith permissions, limited
30-day retention~25% average~3% average
Store presenceApp Store + Play StoreN/A
Biometric paymentsNative Face ID / fingerprintBrowser only
Graphic performance60fps, native animationsDepends on browser

Tech Stack

Proven technology for apps that scale

We use modern, open-source technologies backed by the world's largest communities. Your app will be built on solid, documented foundations with globally available talent.

React Native

One codebase, two platforms

TypeScript

Robust, maintainable code

Node.js

High-performance backend

Firebase

Push, auth & analytics

PostgreSQL

Scalable database

AWS / Vercel

Cloud infrastructure

NixMar Studio developer programming a mobile application with dual monitors

Our Work

Apps designed for real results

Every project is a custom solution. This is how we work for our clients.

Application control dashboard developed by NixMar Studio

Management dashboard with real-time metrics

NixMar Studio mobile development project portfolio

Cross-platform design iOS and Android

NixMar Studio development team in mobile app planning meeting

Collaborative planning with the client

Success Stories

Clients already in the stores

Our app has 4.9 stars on the Play Store and has tripled our customers' purchase frequency. The investment paid for itself in 4 months.

Sebastián F.

CEO of food delivery, Greenwich

The team delivered on time and on spec. The app works perfectly on iOS and Android. Our users love it and post-launch support has been excellent.

Patricia G.

Director of fintech startup, New York

Push notifications have been a game-changer. We recovered inactive customers at a 34% rate. Without a doubt the best tech investment of the year.

Mario D.

Founder of education platform, USA

FAQ

Everything about mobile app development in the USA

The price depends on complexity. A basic app starts from $8,000 USD. Apps with advanced features like payments, geolocation, or real-time chat range between $12,000–$25,000 USD. We offer detailed quotes at no cost or commitment.

A typical project takes between 14 and 18 weeks (3.5 to 4.5 months) from discovery to store publication. Simpler apps can be ready in 10 weeks.

Yes. We use React Native, which allows us to develop both platforms with a single codebase. This reduces costs and development time by 30–40% compared to separate native development.

It includes: discovery and strategy, UX/UI design in Figma, complete development, QA with real devices, App Store and Google Play publishing, ASO optimization, and 3 months of post-launch support.

Yes. We work with agile methodology with demos every 2 weeks. Plus, we give you access to testing builds so you can test the app on your own device throughout the process.

Yes. The first 3 months of support are included. After that, we offer monthly maintenance plans covering OS updates, bug fixes, performance improvements, and new features.

Limited spots · Guaranteed response in 24h

How much is your business losing every day without an app?

In 30 minutes we define the scope, ideal technology, and exact budget for your mobile application. No commitments, no fine print — just a conversation that can transform your business.

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