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Mobile app development

iPhone, Android, and cross-platform apps taken from an idea to a working product, built natively with Swift and SwiftUI or Kotlin and Jetpack Compose, or with React Native and Expo, and paired with a web platform where the product needs one.

Start a Project

Custom pricing · let’s scope it together

Who it’s for

  • Founders with an app idea who need a working first version
  • Businesses whose customers search, book, or pay from their phones
  • Products that need iPhone or Android apps alongside a web platform

Problems it solves

  • Finding and booking something that still happens by message or phone call
  • An everyday task that should take seconds on a phone
  • An idea that needs to be in people’s hands before it can be tested

What’s included

  • Product design for the app’s screens and flows
  • Native iOS (Swift and SwiftUI), native Android (Kotlin and Jetpack Compose), or React Native and Expo
  • Accounts, sync, and a backend where the app needs one
  • A companion web app or admin where the product needs one

Custom pricing · let’s scope it together. The final scope and price are set in a written agreement before work begins.

How it works

  1. 01

    Tell me about it

    Send an inquiry or book a 30-minute call. We talk through what you need, and you get a scope and a price.

  2. 02

    Agree in writing

    The scope, price, and payment terms go into an agreement you review and sign online. Nothing starts until it’s signed.

  3. 03

    Design and build

    You review the work in stages, such as the design and a working version on a staging (test) site, with rounds of revisions at each review.

  4. 04

    Launch and hand over

    The project goes live and the files are handed over. Bugs in the delivered work are fixed at no extra cost during the bug-fix period in your agreement.

Technologies

Used across the example projects below.

  • Next.js
  • React Native
  • Expo
  • TypeScript
  • Tailwind CSS
  • Supabase
  • PayMongo
  • Vercel
  • Swift
  • SwiftUI
  • SwiftData
  • Swift Charts
  • WidgetKit
  • React Native Skia
  • TanStack Query
  • Zustand

Examples

Questions

iPhone, Android, or both?
Either, or both. 13C has native apps for both: Swift and SwiftUI on iPhone, Kotlin and Jetpack Compose on Android. gastos is native Swift and SwiftUI, while AIR/Rally and DICTA use React Native and Expo, which can also target Android. The right choice depends on who will use the app, and it’s settled while scoping.
Why is mobile priced per project?
Apps vary the most in scope, from a single-purpose tool to a platform with accounts, payments, and a web side. Pricing starts with a conversation about what the first version needs.
Payments, ownership, and more questions

Start a Project

Have an idea?

Tell me what you’re thinking. Let’s turn it into something real.