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.
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
- 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.
- 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.
- 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.
- 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.
Start a Project
Have an idea?
Tell me what you’re thinking. Let’s turn it into something real.












