iOS and Android app development

At RexDevs we build custom mobile apps for iOS and Android, native or cross-platform, and get them published on the App Store and Google Play. We include the backend and admin panel the app needs, and the same team handles the legal side: who owns the code, terms and conditions, the privacy notice and registering the app. We work from Mexico City with companies and founders across the country.

Tell us about your project

Updated November 10, 2026

What does app development include?

An app is more than what you see on the phone. To work in production it needs a server to store the data, a panel to manage it and a proper release on the app stores. We take care of that whole path:

  • Experience design and prototypes you can try before any code is written.
  • Native apps (Swift for iOS, Kotlin for Android) or cross-platform (Flutter, React Native with Expo).
  • Backend, database and API, with an admin panel for your team.
  • Notifications, payments, maps, camera and integrations with your systems.
  • Publishing on the App Store and Google Play, and support after launch.

Native or cross-platform app?

A cross-platform app shares most of its code between iOS and Android, which usually cuts the time and cost to build and maintain it. A native app is written separately for each system and makes sense when the product relies heavily on device-specific features or needs maximum performance.

There's no one-size-fits-all answer: we decide it during the design stage, based on what your app has to do, your budget and how you plan to grow it.

How much does it cost to build an app?

It depends on scope: number of screens, user types, integrations, payments and the legal work you need. Before we start we define what gets built, in what order and what it costs, and you get a single proposal that covers both the software and the legal side. If your budget is tight, we propose a first version with just what you need to launch and learn.

Who owns the code?

It's agreed in writing before we start. Custom software is normally handled as a work made for hire: the economic rights are yours from the moment each deliverable is created, under article 83 of Mexico's Federal Copyright Law (LFDA), with no separate transfer needed afterward. If the product already existed or you prefer a lower cost, we use an assignment of rights or a license.

At delivery we identify the main open source components and their licenses, so you know what obligations they carry. That way you can sell your software, license it or show it to investors with no gaps in the chain of title.

How do we work?

Every project follows the same path, and you deal directly with the team that designs and writes the code, with no middlemen.

  • Understand: we listen to the problem, your users and your goals, and define scope, priorities and a clear estimate.
  • Design: prototypes you can touch and an architecture thought through before the first line of code.
  • Build: frequent releases you can test. You see real progress, not reports.
  • Launch: we ship with tests, monitoring and everything ready for real users.
  • Evolve: support, improvements and new features as your business grows.

Frequently asked questions

Do you publish the app on the App Store and Google Play?

Yes. We prepare the app to meet each store's requirements and publish it. The developer accounts are in your company's name, so the app is yours.

Can I start with just one platform?

Yes. If your users are mostly on iOS or on Android, you can launch on one first. With a cross-platform app, adding the other one later costs much less.

Do you provide support after launch?

Yes. The last stage of our process is to evolve: support, improvements and new features as your business grows.

Will you sign an NDA before hearing my idea?

Yes. If you need one, we sign a non-disclosure agreement before you share the details of your project.

What do you want to build?

Tell us your idea or your problem. We'll reply personally.

Let's talk