Mobile App Development Company in New Jersey and New York City
iOS and Android apps designed, built, and submitted to the App Store and Google Play by a US-based team in Teaneck, NJ and Queens, NY. Fixed-price builds from $3,500; an App Blueprint with a clickable prototype and a fixed quote from $1,250.
Updated · Reviewed by the AppDesign360 engineering team
AppDesign360 (Mango Consulting LLC) is a mobile app development company in Teaneck, NJ and Queens, NY. We build native iOS and Android apps in Swift and Kotlin, and cross-platform apps in Flutter and React Native, then handle App Store and Google Play submission. Builds start at $3,500 for an agreed starter scope; a separate App Blueprint provides a clickable prototype, technical spec, and build quote from $1,250. The written scope confirms included features, platforms, price, and timing.
A free 20-minute scoping call establishes the first workflow and intended users. Your written proposal confirms the platforms, screens, backend, integrations, testing, store-submission responsibilities, price, and schedule. Source code stays in a repository your business owns. Store release is subject to platform approval.
We are the engineers behind AppDesign360, the brand many New Jersey and New York businesses know from our earlier app and web work. Mango Consulting LLC is the legal entity: an SBA-certified Service-Disabled Veteran-Owned Small Business founded in 2018, based in Teaneck, NJ with headquarters in Queens, NY. Everyone on your build is US-based and works Eastern hours, so you can reach the person writing your code during your business day.
Why businesses in NJ and NYC hire us for apps
Fixed price, written scope. You get a number and a timeline before work starts, not an hourly meter that runs until the money is gone.
Store submission in your scope. Agree the target stores and responsibilities for developer accounts, beta testing, listing assets, privacy information, and review responses.
You own everything. Source code, store accounts, backend, and domain are registered to your business from day one.
The right stack, not a default. Flutter or React Native when one codebase makes sense; native Swift and Kotlin when performance or hardware access demands it.
Backend capabilities. We can build authentication, databases, notifications, payments, and admin tools. The proposal identifies which features are included.
Local when it matters. Based in Teaneck and Queens, we meet in person by appointment across Bergen County, the five boroughs, and Fairfield County, CT.
Recent work
TripSyncer
Consumer travel app · iOS and Android
AI-powered travel app for planning road trips, hosting events, and managing tours with shared itineraries and real-time collaboration.
One cross-platform codebase shipped to both the App Store and Google Play
Real-time itinerary collaboration between travelers
Client rated the engagement five stars and is scoping a second build with us
Staff rewards app where employees play a quiz game and earn points that convert into discounts on purchases.
Gamified engagement tied to a real rewards ledger
Simple onboarding designed for an existing workforce, not app-store strangers
mTaxi
Taxi booking app · international client
Ongoing engineering partner for a taxi booking application whose owners do not work in English.
Delivered across a language barrier with clear written specifications
Long-term solution-provider relationship after the first release
Pricing
App Blueprint
$1,250 – $2,500
1–2 weeks
Discovery workshop and written requirements
User flows and a clickable prototype of every core screen
Technical spec: stack, backend, integrations, store requirements
Fixed-price quote and timeline for the build
Yours to keep; credited toward the build if you continue with us
Starter app
From $3,500
Schedule confirmed after scoping
An agreed starter workflow and screen scope
iOS, Android, or a scoped cross-platform build
Design, implementation, and release checks defined in your proposal
Backend, integrations, and store submission responsibilities confirmed in writing
Business app / MVP
Custom quote
8–12 weeks
iOS and Android from one codebase
Bookings, ordering, or in-app payments (Stripe, Apple Pay, Google Pay)
Custom backend, database, and admin portal
Analytics, crash reporting, and beta testing
30 days of post-launch fixes
Custom platform
Custom quote
12–20 weeks
Native Swift and Kotlin where the requirements demand it
Offline-first sync, maps, chat, video, or hardware integrations
HIPAA-aware architecture for health data
Integrations with EHR, CRM, ERP, or POS systems
Dedicated project lead and staged releases
Mobile app builds start at $3,500 in USD for an agreed starter scope. Business apps, larger MVPs, and custom platforms receive individual quotes. The written proposal confirms screens, platforms, backend, integrations, store submission, price, and timeline. Post-launch support runs on a monthly retainer or at our custom software rate, from $20 per hour. A separate App Blueprint can help define the project before development. Builder coaching remains a separate service from $125 per session if you are developing the app yourself. Coaching does not include an implementation project or app release.
Who we help
Healthcare and dental practices
Patient scheduling, secure messaging, and telehealth companions with HIPAA-aware data handling and BAA-ready vendors.
Restaurants and retail
Ordering, reservations, loyalty points, and push offers for Bergen County storefronts and NYC neighborhoods with regulars.
Home services and contractors
Field apps for estimates, photos, scheduling, and invoicing that keep working in a basement with no signal.
Real estate and property management
Listing apps, tenant portals, maintenance requests, and rent payments.
Logistics and transportation
Dispatch, driver apps, live tracking, and proof of delivery, like the taxi and bus-booking systems we have shipped.
Startups and SaaS founders
Investor-ready MVPs with real authentication, billing, and analytics, with capacity requirements and launch checks agreed in scope.
Native vs. cross-platform: what we recommend
Flutter / React Native
Native Swift + Kotlin
Best for
Most business apps, MVPs, ordering and booking
Camera-heavy features, AR, Bluetooth hardware, high-frame-rate games
Codebases to maintain
One
Two
Build pricing
From $3,500 for a scoped starter app; larger projects quoted individually
Quoted after platform and feature review
Time to both stores
8–12 weeks
12–16 weeks
Performance
Near-native for standard interfaces
Maximum
Our recommendation
Default for most clients
When discovery shows a real need
Compare the same written requirements. Discovery confirms platform choices, scope, and price.
What's Included
Written scope listing the screens, platforms, and included features
Agreed mobile interface design and implementation
Backend, database, APIs, and admin tools when included in scope
Notifications, analytics, and error reporting where specified
Payments and subscriptions only as specified in your proposal
Offline use and external integrations when scoped
Testing and store-submission responsibilities agreed in writing
30 days of post-launch fixes for the agreed build
How It Works
Scoping: free 20-minute call, then written requirements, included work, price, and schedule
Design: agree the user flows, screens, and prototype work needed for this release
Development: implement the agreed workflow and review milestone builds
Verification: test the scoped devices, integrations, and critical user journeys
Submission and handover: complete the agreed store work and transfer documentation and accounts; approval is controlled by the stores
After launch: 30 days of fixes for the agreed build, then optional support
Mobile app builds start at $3,500 for an agreed starter scope. Business apps, larger MVPs, and custom platforms are quoted individually based on platforms, screens, backend, integrations, and release requirements. You get a fixed price after a free 20-minute scoping call. If your budget is smaller, an App Blueprint ($1,250–$2,500) gives you a clickable prototype, a technical spec, and a fixed quote you can use with any developer.
An App Blueprint: a discovery workshop, user flows, a clickable prototype of the core screens, a technical spec, and a fixed-price quote for the build, delivered in 1–2 weeks for $1,250–$2,500 and credited toward the build if you continue with us. If you are building the app yourself with AI tools, separate builder coaching starts at $125 per session. Coaching is advice, not app implementation or release. A custom app build starts at $3,500.
Your written scope confirms the schedule after we review the screens, platforms, backend, integrations, testing, and store-submission requirements. The $3,500 starting fee does not imply a universal delivery time.
Cross-platform Flutter or React Native is right for most business apps: one codebase ships to both stores faster and costs less to maintain. Native Swift and Kotlin is right when you need camera-heavy features, Bluetooth hardware, AR, or maximum performance. We decide in discovery, not from a default stack.
Yes, when included in your written scope. We agree the target stores, developer-account responsibilities, beta testing, listing assets, submission, and review responses. Accounts remain in your business name, and the stores control approval.
You do, from day one. The code lives in a repository you own, store accounts and domains are registered to your business, and we hand over every admin credential at launch.
Yes. We start with a paid code review that documents the app, its risks, and a fix list, then continue with feature work or a rebuild depending on what the review finds.
Yes. We can build authentication, databases, APIs, notifications, payments, analytics, and admin tools. Your proposal confirms which are included in the agreed app scope; the $3,500 starting fee does not include every backend or integration requirement.
Yes, with HIPAA-aware architecture: encryption in transit and at rest, BAA-ready vendors, minimal data retention, and protected health information kept out of analytics and logs. Raise it on the scoping call and we will design for it from the start.
Yes. Mango Consulting LLC is the legal entity, an SBA-certified Service-Disabled Veteran-Owned Small Business. AppDesign360 is the brand we use for app and web work. Same engineers, same quote form at appdesign360.com/quote.
No. We are based in Teaneck, NJ and Queens, NY, and we meet clients in person by appointment across Bergen County, the five boroughs, and Fairfield County, CT. We also build for clients across the United States and Canada over video calls.
Every project includes 30 days of fixes. After that, choose a monthly support retainer or pay for changes at our custom software rate, from $20 per hour. For retainer clients we also monitor crash reports and store reviews.
Ready to get started?
Tell us the problem, intended users, and the stage of your app.
