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 $12,000; an App Blueprint with a clickable prototype and a fixed quote from $2,500.
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. Fixed-price builds start at $12,000 and a scoped MVP ships in 8–12 weeks; an App Blueprint (clickable prototype, technical spec, and fixed quote) starts at $2,500 for smaller budgets.
Most app projects go wrong before the first line of code: the scope is vague, the budget is a guess, and nobody owns the App Store submission. We fix all three. Every project starts with a free 20-minute scoping call, gets a fixed price and a written timeline, and ends with your app live on both stores and the source code in a repository you own.
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.
Both stores, handled. Apple Developer and Google Play Console setup, TestFlight and internal testing, listing metadata, screenshots, privacy labels, and review appeals.
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 included. Authentication, database, push notifications, payments, and an admin panel are part of the build, not a second vendor.
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
$2,500 – $5,000
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
$12,000 – $25,000
6–8 weeks
One platform, or Flutter / React Native for both
Up to 6 core screens
Sign-in, profiles, and push notifications
Simple backend and admin view
App Store and Google Play submission
Business app / MVP
$25,000 – $60,000
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
$60,000 – $150,000+
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
These are the ranges most projects land in, not quotes. Every price is fixed after a free 20-minute scoping call and a written scope. Post-launch support runs on a monthly retainer or at our custom software rate, from $25 per hour. Budgets under $12,000 start with the App Blueprint, or with Vibe Coding Support from $125 per session if you are building the app yourself with AI tools.
Industries we build for
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, built to survive the first 10,000 users.
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
Typical MVP cost
$25,000 – $60,000
$40,000 – $90,000
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
Ranges reflect typical projects we scope; discovery decides the stack, not a default.
What's Included
Native iOS (Swift) and Android (Kotlin) apps
Cross-platform development with Flutter and React Native
Backend, database, APIs, and admin panel
Push notifications, analytics, and crash reporting
In-app purchases, subscriptions, Stripe, Apple Pay, and Google Pay
Offline-first architecture and sync
App Store and Google Play submission, listing, and review appeals
30 days of post-launch fixes on every project
How It Works
Week 0: free 20-minute scoping call, then a written scope, fixed price, and timeline
Weeks 1–2: discovery, user flows, and a clickable UX/UI prototype you approve before code
Weeks 2–10: two-week sprints with a build you can install on your phone at the end of each sprint
Weeks 9–11: QA on real devices, TestFlight and Play internal testing, security review
Week 12: App Store and Google Play submission, launch checklist, handoff of code and accounts, 30 days of fixes
Most of our projects land between $12,000 and $60,000. A starter app on one platform runs $12,000–$25,000, a business app or MVP for both iOS and Android runs $25,000–$60,000, and a custom platform with integrations, offline sync, or health data runs $60,000–$150,000 or more. You get a fixed price after a free 20-minute scoping call. If your budget is smaller, an App Blueprint ($2,500–$5,000) 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 $2,500–$5,000 and credited toward the build if you continue with us. If you are building the app yourself with AI tools, Vibe Coding Support sessions start at $125. A custom app build starts at $12,000; anyone offering a full custom app for $3,000 is selling a template or offshore hours with no ownership.
A starter app takes 6–8 weeks, a scoped MVP 8–12 weeks, and a custom platform 12–20 weeks. Those timelines include design, development, testing on real devices, and store submission.
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. We set up your Apple Developer and Google Play Console accounts in your name, run TestFlight and internal testing, prepare listing metadata, screenshots, and privacy labels, submit for review, and handle any rejections.
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. Authentication, database, APIs, push notifications, payments, analytics, and an admin panel are part of the build. We typically use Node.js with PostgreSQL, or Firebase for smaller apps.
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 quote.appdesign360.com.
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 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 $25 per hour. For retainer clients we also monitor crash reports and store reviews.
Ready to get started?
Tell us what you want to build on a free 20-minute call and get a fixed price with a timeline. We respond within minutes during US business hours.
