iPhone & Android apps

Native appswithout the agency price tag.

Like mine, which is live on the App Store. Swift for iPhone, Kotlin for Android, and the backend that connects them. Start with a plan and a prototype in one week.

Message me on WhatsApp See pricing

iPhone + Android from $12,000iPhone only from $6,500

Sofi, my native app live on the App Store

With AI Apps NJ, a native iPhone app starts at $6,500 and iPhone + Android starts at $12,000, including a basic backend and publishing to the App Store and Google Play. Many agencies ask for $25,000–$50,000 minimums.

What's included.

What the starting price covers. Anything else is quoted separately, at a fixed price.

See pricing

01Swift (iPhone) and Kotlin (Android)
02Sign-in, profile and push notifications
03Basic backend and admin panel
04Publishing on the App Store and Google Play

Start here

Start with a plan + prototype: $750

In one week you get the list of screens, a prototype you can tap through on your phone, a fixed price and a delivery date. If we build the app, the $750 is credited.

Scoping call
List of screens and features
Clickable prototype on your phone
Fixed price and delivery date
Credited toward the app

I want the plan

Ready in 1 week

The comparison

Native, without the agency price.

Development agencies

$25,000–$50,000

typical minimum to start

AI Apps NJ

from $12,000

native iPhone + Android, with backend and publishing

Agencies: $25,000–$50,000 minimums. Here: native iPhone + Android from $12,000. Source: Clutch / DesignRush, oct 2026

Who it's for.

Real cases from businesses like yours.

Business	Problem	Solution
Home services	Bookings come in by phone and nobody knows where the tech is	In-app booking and live GPS, like Polo
Gym, school or church	Announcements get lost in group chats	Calendar, push notifications and a widget
Business with repeat clients	You don't know who comes back or when	Client accounts, history and bookings
Founder with an idea	An agency quoted more than $25,000 just to start	A native MVP in both stores to validate the idea

See it working.

My own projects, live right now.

See all my work

Native iPhone app · live on the App Store

Sofi

An AI assistant that remembers what you tell it, talks back, and does real things on your phone.

Native app in Swift and SwiftUI
Voice, CarPlay and widgets
On-device memory and connections to other apps (MCP)
Published and maintained on the App Store

Swift · SwiftUI · WidgetKit · CarPlay · OpenAI · Gemini · Claude

View on the App Store

Built by Julian Rua

Web platform + iOS app + Android app + API

Polo App

A marketplace to book boarding, walks, grooming and vet care for pets.

Online bookings between clients and businesses
Maps and live GPS tracking of walkers
Bilingual web, iPhone (Swift) and Android (Kotlin) apps
Custom .NET API with an Azure database

Next.js · React · Swift · Kotlin · ASP.NET Core · Azure SQL · Google Maps

Open Polo

Built by Julian Rua

iPhone app live on the App Store + backend + website

Luka

Logging expenses by hand is tedious. Luka records and categorizes them automatically: it reads your iPhone purchases and your bank alerts.

iPhone app in Swift, live on the App Store in English and Spanish
AI categories, calendar, history and charts
Custom Python backend that processes every expense
Website built with Astro on Cloudflare

Swift · SwiftUI · Python · FastAPI · PostgreSQL · Astro · Cloudflare

View on the App Store See Luka's website

Built by Julian Rua

See my experience on LinkedIn

How it works.

See the full process

0120-minute call: you tell me the idea
02Plan + prototype in one week, with a fixed price
03I build the app and you see progress on your phone every week
04I publish it to the App Store and Google Play, and keep it running

Pricing.

A fixed price, in writing, before we start. You pay part to start and the rest on delivery.

See all pricing

Recommended

Native iPhone + Android app

Both stores, fully native, backend included

From $12,000+ $299/mo · app maintenance (optional)

Request a quote

Typical timeline: 8–12 weeks
Deposit: 40%
What's included: Swift (iPhone) and Kotlin (Android)

Native iPhone app

Start on iPhone, add Android later

From $6,500+ $299/mo · app maintenance (optional)

Request a quote

Typical timeline: 6–8 weeks
Deposit: 40%
What's included: Swift and SwiftUI

App plan + prototype

In one week: screens, fixed price and a prototype on your phone. Credited if you continue

From $750

Request a quote

Typical timeline: 1 week
Deposit: 100%
What's included: Scoping call

Technology: Swift · SwiftUI · WidgetKit · CarPlay · Kotlin · Jetpack Compose · Firebase · Google Maps

Frequently asked questions.

Why native instead of Flutter or a web app?

Native is the fastest, makes the best use of the camera, GPS, notifications and widgets, and integrates best with the phone. If your budget calls for something else, I'll tell you on the call.

What does the starting price include?

The MVP: sign-in, the core screens of your idea, push notifications, a basic backend with an admin panel, and publishing to the stores. Extra features are priced in the plan, at a fixed price.

Do I need a developer account?

Yes, in your name: Apple charges 99 USD a year and Google 25 USD once. I'll help you set them up.

What happens after launch?

With the optional monthly plan I handle iOS and Android updates, crash monitoring and small changes. Without it, the app and the code are yours.

All questions

Tell me about your app idea.

I'll reply on WhatsApp, in English or Spanish. If you prefer, we can book a 20-minute call.

Message me on WhatsApp Book a call

I'd rather leave my details