Mobile App Development For iOS And Android
We build iOS and Android apps in React Native, Flutter and Swift, and take them through App Store and Google Play release. Nextflag, a map-based social app, is one we made faster and more stable for both platforms.
Reviewed by Azmat Rana, CEO & Founder · Updated
What We Build For Mobile
People judge an app in its first few minutes, on speed, stability and whether it does the thing they downloaded it for.
Core capability
Native iOS apps
Swift apps for features that lean on the device. Slumber & Sprout gives parents sleep tracking and routines for their children in a native iOS app.
Cross-platform apps
One React Native or Flutter codebase for iOS and Android. Nextflag and Trusted Tastes run on React Native.
White-label apps
One codebase configured per customer. StoreBevy lets small retailers launch their own branded store app.
Backends and notifications
APIs, background jobs and push notifications. Slumber & Sprout’s Rails backend recalculates sleep schedules with Sidekiq when a routine changes.
Store releases
Signing, TestFlight and Play Console tracks, and store listings for both platforms, planned from the first sprint.
Project story · Nextflag
Making a social travel app dependable again
Nextflag lets people drop flags on places they love, follow friends and plan trips from real recommendations. It is a React Native app on iOS and Android with a Rails GraphQL backend. When it reached us, it was slow, crashed during uploads and lost new users halfway through sign-up.
- Team
- 2 engineers
- Effort
- 1,602 hours
- Platforms
- iOS and Android
- Stack
- React Native, Redux, Rails GraphQL, PostgreSQL
The problem
React Native and its native packages had fallen behind, so the app lagged. The post-upload screen crashed often. People could not reliably find flagged places, which is the whole point of the app, and searching a region was weak. Onboarding bugs dropped sessions and lost progress mid-flow.
What we changed
- 01Upgraded React Native, its packages and the iOS pods, then tuned the app for smoother performance.
- 02Rewrote the post-upload flow and removed the code that made it crash.
- 03Added a map screen with geolocated markers and filters by flag type, so flagged places are easy to find again.
- 04Built a search screen that uses location data to surface flags and wishlist items by city.
- 05Saved onboarding progress at every step and added session resume, so new users no longer lose their place.
- 06Swapped the static splash screen for an animated one that loads faster and takes up less storage.
Where it stands
The app is stable on both platforms, flagged places are easy to find again and more new users finish onboarding. It is a common pattern in mobile work: the biggest gains came from fixing an app people already used, before adding anything new.
Read the full Nextflag case studyFrom Concept To Scale
Mobile work is planned around the app stores as much as the code, so releases never become the bottleneck.
Discover
Pick The Platforms
We choose native, React Native or Flutter based on the features you need and who will maintain the app.
Develop
Test On Real Phones
Builds go out through TestFlight and Play Console testing tracks, so you try the app on your own phone every week.
Release
Ship To Both Stores
We handle signing, listings and store review, then keep the app current with each iOS and Android release.
Technology Behind Mobile Apps
The mobile frameworks and backends behind the apps we have shipped.
Swift
Kotlin
React Native
Flutter
Node.js
Python
.NETReact
Next.js
GraphQLNative, Cross-Platform Or A Web App?
The right build depends on what the app has to do and who will maintain it. This is how we usually decide.
Native Swift or Kotlin
When the app leans on the device, such as health data, background location, widgets or heavy animation, or when you only need one platform.
React Native
When a React web team will share knowledge and some code, and the app is mostly screens, feeds, forms and API calls. Nextflag is built this way.
Flutter
When a custom design has to look identical on every phone. StoreBevy’s white-label store app is built in Flutter.
A fast web app instead
When people visit occasionally and need neither offline use nor push notifications, a mobile-friendly web app can do the job without store reviews.
Plan the store releases
App Store and Google Play review, signing and staged rollouts take real time, so they belong in the delivery plan from day one.
Plan for after launch
Operating-system updates and package upgrades keep coming. Nextflag’s slowdown came from falling behind on them, so keep time for upkeep every year.
Mobile Apps In Action
Apps from our portfolio across iOS and Android.
Related services
Projects like this one usually involve these as well.
Further reading: React Native or Flutter? How we choose for client apps
Prefer to add engineers to your own team?
Hire full-time developers in the stacks we use for this work.
Mobile App Development FAQs
What teams ask before they build or take over an app.
Go native when the app depends on device features such as health data, background location or widgets, or when you only need one platform. Choose cross-platform when you need iOS and Android from one team and the app is mostly screens, feeds and API calls, which describes most business apps.
React Native uses native components and suits teams that already write React. Flutter draws every pixel itself, which keeps a custom design identical across devices. Both ship to iOS and Android from one codebase, and we build in both.
Yes, natively in Swift and Kotlin or with React Native and Flutter. Nextflag and Trusted Tastes are mobile apps we have built.
Yes. Most of our Nextflag work was exactly that: upgrading an outdated React Native setup, fixing the crashes users hit and rescuing a broken onboarding flow before adding features.
Yes. We handle signing, test builds, store listings and replies to review feedback, or work inside the release process you already have.
You do. Everything we build for you, including the source code and the intellectual property in it, belongs to you.
Yes. Apps usually talk to your backend through an API, as Nextflag does with its Rails GraphQL server, and from there to CRMs, payment providers and other business systems.
Planning An App?
Tell us what it should do and who it is for. We reply within one business day to set up a discovery call.