New York · Mobile App Development
Mobile App Development Company in New York
4Byte is a mobile app development company that works with startups and businesses in New York. We build custom iOS, Android, and cross-platform apps with senior engineers at a fraction of what a Manhattan agency charges.
A typical app development engagement in New York starts at $50,000 and goes up fast. For a VC-backed startup burning through a Series A, that number might not matter. For everyone else, it means choosing between building the app properly and building the app at all.
We are the third option. Senior engineers, the same technologies NYC's best agencies use, direct access to the founders who write the code, and a cost structure that lets you build the whole app instead of cutting features to fit the budget.
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Trusted by businesses building products.
Trusted by teams building the future
Why mobile
Why New York Businesses Are Building Mobile Apps
New York runs on phones. Your customers order, browse, pay, commute, and invest from apps built by the best product teams in the world. That is the bar your app is measured against, whether you like it or not.
What we build
App Development Services for New York Businesses
We handle the full build remotely, with the same quality a local NYC firm would deliver.
Native iPhone and iPad apps built to Apple's standards. Fast, polished, and ready for the App Store.
Premium products, high iPhone usageNative Android apps built to perform across the full range of devices real users carry.
Reaching beyond the iPhone-heavy Manhattan marketCross-platform apps built with React Native, one codebase for iOS and Android. The technology behind apps from Meta, Shopify, Discord, and Bloomberg, and our most recommended approach.
Both platforms, faster and at a lower costCross-platform apps built with Flutter, Google's framework for natively compiled apps from one codebase.
For a highly custom UI across both platformsA focused first version with only the features needed to launch, get real users, and learn what to build next.
Founders validating an idea or preparing to raiseShopping, ordering, and delivery apps with payments, live tracking, and smooth checkout.
D2C brands, restaurants, retailersSecure apps for payments, investing, lending, and financial management. Built to the standards Wall Street and the financial district expect.
Fintech startups and financial servicesA rebuild for an app that is slow, crashing, outdated, or built on a stack your team has outgrown.
For an app hurting more than helpingThis page covers how we work with New York clients. For the full process, tooling and deliverables behind every build, see our app development services page.
The tech decision
iOS, Android, or Cross-Platform. Which Should You Build?
This is the first real decision, and the wrong one wastes money. Here is the honest breakdown.
| Native (iOS or Android) | React Native or Flutter | |
|---|---|---|
| What it is | A separate app for each platform | One codebase that runs on both |
| Speed to launch | Slower, two separate builds | Faster, one build, both app stores |
| Cost | Higher | 30 to 40 percent lower for most projects |
| Performance | Maximum, for heavy apps | Excellent for the vast majority |
| Best for | Games, AR, hardware-heavy features | Most business, fintech, startup, and e-commerce apps |
The honest default: for most New York startups and businesses, React Native or Flutter is the smarter choice. You reach both audiences, launch faster, and spend significantly less, with performance that handles everything most apps actually need.
React Native is what we recommend most often. It is backed by Meta, powers apps used by hundreds of millions of people, and has the strongest ecosystem for business apps. We recommend native only when your app genuinely requires it, and we will tell you which path is right during the free consultation.
Capabilities
Features We Build Into Apps
Building blocks we have shipped before, so they arrive proven.
Email, phone, social sign-in, biometrics, and Apple Sign In.
Stripe, Apple Pay, Google Pay, and in-app purchases.
The feature that brings users back, done without being annoying.
Live tracking, chat, and instant updates.
GPS, geofencing, and location-aware experiences.
Photo, video, document scanning, and uploads.
Apps that work in the subway and other dead zones.
Help without leaving the app.
The web panel your team uses to manage the app.
Understand what users actually do, not what you hope they do.
Recommendations, smart search, assistants, and automation.
CRMs, ERPs, payment systems, and APIs.
The comparison
How Working With Us Compares to a NYC App Agency
| Typical NYC agency | 4Byte | |
|---|---|---|
| Hourly rate | $150 to $300 per hour | $25 to $50 per hour |
| Typical app cost | $50,000 to $200,000+ | 50 to 70 percent less |
| Who you talk to | Account manager | The founders who write your code |
| Who builds it | Rotating team, often juniors | Senior engineers, same people start to finish |
| Timeline | 4 to 8 months | MVP in 6 to 10 weeks, full app varies |
| Communication | Email chains through PMs | Direct Slack or WhatsApp, response within 4 hours |
| Code ownership | Sometimes theirs | Always yours |
| App Store submission | Usually extra | Included |
| After launch | New SOW, new rates | Same team, same rates, ongoing |
How we work across timezones
We overlap with New York's late afternoon and evening. Most US clients do a weekly call plus async updates on Slack, and install test builds on their phone whenever they want. Responses come within 4 hours.
You talk to the same two founders from day one to App Store. No rotation, no handoffs, no surprises.
How it works
Our App Development Process
Investment
App Development Cost for New York Businesses
An honest comparison of what an app costs with a New York agency versus working with us.
| Type of app | Typical NYC agency cost | 4Byte cost |
|---|---|---|
| Simple app (MVP, few features) | $25,000 to $60,000 | $6,000 to $15,000 |
| Mid-complexity business app | $60,000 to $120,000 | $15,000 to $30,000 |
| E-commerce or on-demand app | $80,000 to $200,000 | $18,000 to $40,000 |
| Complex or enterprise app | $150,000 to $300,000+ | $35,000 to $70,000+ |
Final pricing depends on project complexity, features, and integrations. These ranges are a starting guide, not a quote.
The difference is not quality. It is structure. NYC agencies pay Manhattan rent, Manhattan salaries, and layers of account managers and project coordinators. We are two founders and senior engineers with none of that. Your budget goes into the actual build.
After a free consultation, you get a fixed, written estimate in USD. No hourly billing, no scope creep, no surprise invoices.
Working remotely
Why Trust a Remote Team for Your New York App
Yes. We build with React Native, Swift, Kotlin, Node.js, Supabase, and AWS, the same stack used by NYC's top mobile agencies. The code and the product are identical. What changes is the cost of the people writing it.
No. You talk to the founders directly. Weekly calls, async on Slack, and a test build on your phone every week.
Yes. You own the app, the code, the design files, and the store accounts from day one. NDA signed before we see anything.
Clear, written contracts with defined scope. Payments in USD, milestone-based. You pay for work you have reviewed.
We fix it. Post-launch support is standard. And because we built it, fixes are faster and cheaper than bringing in someone new.
Technology
Technologies We Build With
Our most recommended framework. One codebase, both platforms, used by Meta, Shopify, and Bloomberg. Fast launch, lower cost, no compromise.
Google's cross-platform framework. Great for custom, animation-heavy UIs.
Native iOS development. Maximum performance for apps that genuinely need it.
Native Android development. Full platform access and the best Android experience.
Node.js, Python, PostgreSQL & Supabase. Accounts, data, and business logic built to scale.
Stripe, Apple Pay & Google Pay. Secure, reliable, trusted.
AWS, Google Cloud & Firebase. Infrastructure that grows with your app.
OpenAI & on-device AI. Recommendations, assistants, and automation where they earn their place.
Industries
Industries We Build Apps For in New York
Payment, investing, and lending apps for the financial district and beyond.
Mobile shopping experiences for brands selling from New York to everywhere.
Mobile products for NYC's startup ecosystem.
Ordering, tracking, and service apps for every borough.
Content and streaming apps that handle high traffic.
Appointment booking, telemedicine, and health tracking.
Property discovery, listings, and lead capture for brokers and developers.
Feeds, profiles, and real-time interaction.
Shopping apps built for speed, payments, and repeat purchases.
Apps that make teams faster.
Where we work
Areas We Work With Across New York
We work remotely with businesses across the New York metro area.
Timezone overlap with your late afternoon means real-time collaboration every working day. Test builds on your phone every week.
Our work
Our Work
ExcelAI, a mobile-first AI data platform
Funnell.ai, an AI product launched in 4 weeks
The team
The People Who Will Build Your App
You work directly with the founders. No account managers, no rotating teams, no juniors.
Abdun Noor Faruki Biswas
Abdun leads product strategy and client relationships. Over five years building apps, SaaS, and AI systems. Every project tied to a real business outcome.
LinkedIn →
Imran Shaikh
Imran owns the architecture and engineering standards. Five plus years shipping production apps. Makes sure every app is fast, stable, and built on code that lasts.
LinkedIn →Why 4Byte
Why New York Businesses Work With 4Byte
Senior engineers, same stack, without the overhead that inflates the bill.
The people writing your code, not a relay chain.
Our most-used framework, proven across dozens of shipped apps.
No hourly billing, no scope creep.
Design, development, testing, submission, and launch.
Code, store accounts, design files, IP. No lock-in.
Weekly progress, test builds on your phone, response within 4 hours.
Same team, same rates, ongoing improvements.
▸ Social Proof
Don't take our word
hear it from them.
Real clients. Real results. Verified reviews from founders, CTOs and operators who shipped with us.
“They did an amazing job and built exactly what I was looking for. It's not often you find someone that fully understands your vision, but he did everything I was hoping for.”
Basir
Founder · Asamaha
“Great experience. Clear communication, stay on task, and deliver exactly what's asked without wasting time. If you need someone dependable who can follow instructions, implement feedback, and get the work done without drama, they're a good fit.”
Britton
Founder · TrackTech
“Needed a website up and running within 24 hours for a presentation, and it was delivered in less than 12 hours. Excellent experience and would happily work with Abdun again.”
Van
Founder · Saveero
“Working with Abdun has been an absolute dream. He implemented the updates to our Insights page with precision and care, mirroring the wireframe I provided perfectly down to the smallest details.”
Vanessa
Founder · Jourlev
“They did an amazing job and built exactly what I was looking for. It's not often you find someone that fully understands your vision, but he did everything I was hoping for.”
Basir
Founder · Asamaha
“Great experience. Clear communication, stay on task, and deliver exactly what's asked without wasting time. If you need someone dependable who can follow instructions, implement feedback, and get the work done without drama, they're a good fit.”
Britton
Founder · TrackTech
“Needed a website up and running within 24 hours for a presentation, and it was delivered in less than 12 hours. Excellent experience and would happily work with Abdun again.”
Van
Founder · Saveero
“Working with Abdun has been an absolute dream. He implemented the updates to our Insights page with precision and care, mirroring the wireframe I provided perfectly down to the smallest details.”
Vanessa
Founder · Jourlev
How Funnell.ai went from an idea to a live AI analytics platform in 4 weeks.
Asif
Founder · Funnell.ai
“Working with Abdun has been an absolute dream. He implemented the updates to our Insights page with precision and care, mirroring the wireframe I provided perfectly down to the smallest details.”
Vanessa
Founder · Jourlev
“Needed a website up and running within 24 hours for a presentation, and it was delivered in less than 12 hours. Excellent experience and would happily work with Abdun again.”
Van
Founder · Saveero
“Great experience. Clear communication, stay on task, and deliver exactly what's asked without wasting time. If you need someone dependable who can follow instructions, implement feedback, and get the work done without drama, they're a good fit.”
Britton
Founder · TrackTech
“They did an amazing job and built exactly what I was looking for. It's not often you find someone that fully understands your vision, but he did everything I was hoping for.”
Basir
Founder · Asamaha
“Working with Abdun has been an absolute dream. He implemented the updates to our Insights page with precision and care, mirroring the wireframe I provided perfectly down to the smallest details.”
Vanessa
Founder · Jourlev
“Needed a website up and running within 24 hours for a presentation, and it was delivered in less than 12 hours. Excellent experience and would happily work with Abdun again.”
Van
Founder · Saveero
“Great experience. Clear communication, stay on task, and deliver exactly what's asked without wasting time. If you need someone dependable who can follow instructions, implement feedback, and get the work done without drama, they're a good fit.”
Britton
Founder · TrackTech
“They did an amazing job and built exactly what I was looking for. It's not often you find someone that fully understands your vision, but he did everything I was hoping for.”
Basir
Founder · Asamaha
“They did an amazing job and built exactly what I was looking for. It's not often you find someone that fully understands your vision, but he did everything I was hoping for.”
Basir
Founder · Asamaha
“Great experience. Clear communication, stay on task, and deliver exactly what's asked without wasting time. If you need someone dependable who can follow instructions, implement feedback, and get the work done without drama, they're a good fit.”
Britton
Founder · TrackTech
“Needed a website up and running within 24 hours for a presentation, and it was delivered in less than 12 hours. Excellent experience and would happily work with Abdun again.”
Van
Founder · Saveero
“Working with Abdun has been an absolute dream. He implemented the updates to our Insights page with precision and care, mirroring the wireframe I provided perfectly down to the smallest details.”
Vanessa
Founder · Jourlev
What clients say
What Our Clients Say
Client testimonials to be added here. US or international clients are strongest for this page.
More Services
Our Other Services in New York
Same team, same city. Here is what else we build for businesses in New York.
Fast, custom-built websites that turn local traffic into enquiries.
View page›iOS, Android and cross-platform apps built to ship and scale.
AI agents and workflow automation that remove manual busywork.
View page›FAQ
Frequently Asked Questions
How much does app development cost for a New York business?+
A typical NYC agency charges $50,000 to $200,000 for an app. We deliver the same quality at 50 to 70 percent less because our overhead is fundamentally different. After a free consultation, you get a fixed estimate in USD with the full scope defined.
How long does it take to build an app?+
A focused MVP typically takes 6 to 10 weeks. More complex apps take longer. You get a firm timeline after the free consultation, and you can install test builds on your phone every week.
Should I build with React Native, Flutter, or native?+
For most New York businesses, React Native is the best choice. It is backed by Meta, powers apps used by hundreds of millions of people, and lets you launch on both iOS and Android from one codebase, faster and at a lower cost. We recommend native only when the app genuinely requires maximum device performance.
What is React Native app development?+
React Native is a framework created by Meta that lets you build mobile apps for iOS and Android from a single codebase using JavaScript and React. It produces real native apps, not web wrappers. Companies like Meta, Shopify, Discord, and Bloomberg use it. For most business and startup apps, it is the fastest and most cost-effective path to both app stores.
Can a remote team build an app as good as a NYC agency?+
Yes. We use the same technologies, the same design tools, and the same app store submission process. You talk to the engineers directly, which often means fewer miscommunications. The difference is cost structure, not capability.
How do you handle the timezone difference?+
We overlap with New York's late afternoon and evening. Weekly calls, async Slack updates, and a test build on your phone every week. Responses within 4 hours. Most US clients say it works better than what they had locally.
Do I own the app and the code?+
Yes. You own the app, the source code, the design files, and the App Store and Play Store accounts. Built on standard technologies, clean handover, no lock-in.
Do you handle App Store and Play Store submission?+
Yes. We handle the full process: developer accounts, listings, screenshots, privacy policies, and the review cycle. Included in every project, not charged as an extra.
Will you maintain the app after launch?+
Yes. Apps need updates with every iOS and Android release. We stay on for maintenance, bug fixes, and new features. Same team, same rates.
Can you add AI features to my app?+
Yes. Recommendations, smart search, assistants, and automation built into the app where they genuinely help. AI-powered products are core to what we do.
Can you rebuild my existing app?+
Yes. We take on redesigns and rebuilds, including apps that are slow, crashing, or stuck on outdated tech. We protect what users rely on while fixing what is broken.
How do we get started?+
Book a free consultation, or send the form on this page. We will talk through your app idea, then give you a clear plan, an honest timeline, and a fixed estimate in USD, with no obligation.
Get started
Get in Touch. Free App Consultation
Tell us what you are building and we will come back within 4 hours with a clear plan, an honest timeline, and a fixed estimate in USD.
100% free. Reply within 4 hours. No obligation. NDA on request.
Start your project
We'll reply within 4 hours.
- WhatsApp, +91 79771 33658
- Email, contact@4byte.agency
- Slack, available after kickoff
Ready?
Ready to Build Your App?
If your app needs to compete in New York, it needs to be built properly. Not rushed, not templated, and not priced as if the developers sit in Midtown.
Tell us your idea. We will give you a straight answer on scope, timeline, and cost, even if that answer is that you are not ready to build yet.
100% free. Response within 4 hours. No obligation.