Cross Platform App Development Services

One codebase. Two stores. No compromise on performance.

Your users are split between iPhone and Android. Building two separate native apps doubles your cost and your maintenance burden. We build a single Flutter app that ships to both platforms, looks right on every screen size, and connects to your backend the same day it launches.

Flutter Dart Firebase REST API MySQL AWS Google Play App Store

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Free consultation · 24hr response

Trusted by companies across the USA

The SIR Group

Cross Platform App Development for Your Business

A retail startup came to us after burning six months with a dev shop that built them an iOS app and then told them Android would be "a separate project." By the time they reached us, they had one platform live, zero Android users, and half their budget gone. We rebuilt the entire app in Flutter in eleven weeks, shipped both platforms simultaneously, and their combined install base hit 4,200 users inside the first month.

Cross platform app development means writing one codebase that compiles to native-quality apps on iOS and Android. Flutter, backed by Dart, is how we do it. The rendered output is not a web view wrapped in a shell. It draws directly to the canvas, which is why Flutter apps feel fast rather than feeling like a mobile website pretending to be an app. We connect the app to your data through REST APIs, handle authentication and real-time sync through Firebase where the project calls for it, and store persistent data in MySQL or push it to AWS depending on your scale requirements.

This service is right for you if you need an app on both platforms but cannot justify the time or cost of two separate native builds. It works well for customer-facing products, internal operations tools, field service apps, booking systems, and marketplaces. One honest limitation worth stating upfront: if your app depends heavily on platform-specific hardware like Bluetooth LE peripherals or deep NFC workflows, native development will give you more control. Flutter covers the vast majority of use cases extremely well, but we will tell you when it is not the right tool before you commit a budget to it.

Why Choose Cross Platform App Development

Ship to Both Stores at Once

One build cycle covers Google Play and the App Store. You do not wait for a second development phase before Android users can download your app.

One Budget, Not Two

A single Flutter codebase typically costs 35 to 50 percent less than two separate native builds. That savings goes toward features, not duplicated scaffolding.

Performance That Feels Native

Flutter renders at 60fps on most mid-range devices because it bypasses the platform's UI components and draws its own. Users rarely notice it is cross platform.

Consistent UI Across Every Device

We design once and test across phone and tablet screen sizes on both platforms. Your brand looks the same whether someone opens the app on a Galaxy or an iPhone 15.

You Own Every Line of Code

All source code, assets, and App Store accounts are yours from day one. We sign an NDA and a contract before any work starts, and we hand off a full Git repository at launch.

Built to Add Features Later

We structure the project so adding a new screen or a new API integration does not require untangling the whole app. Most of our clients come back within six months to expand.

Our Cross Platform App Development Services

Consumer Mobile Apps

Customer-facing apps for iOS and Android built in Flutter, connected to your backend, and submitted to both stores with App Store and Google Play compliance handled.

UI/UX Design for Mobile

Mobile-first interface design that follows platform conventions for iOS and Android while keeping your brand consistent. We prototype in Figma before writing any code.

API and Backend Integration

We connect your app to existing systems through REST APIs, whether that is a Stripe payment flow, a Salesforce CRM, a QuickBooks sync, or a custom backend we build alongside the app.

Firebase and Cloud Setup

Real-time data sync, push notifications, and user authentication configured through Firebase, with AWS handling heavier storage or compute needs as your app scales.

App Rebuild and Migration

If you have an older app that is slow, hard to update, or stuck on one platform, we migrate it to Flutter and modernize the architecture at the same time.

Post-Launch Support

We monitor crash reports, handle OS update compatibility, and push improvements on a monthly retainer so your app does not quietly break when Apple releases a new iOS version.

How We Deliver Cross Platform App Development Projects

No 47-slide proposal deck. No three-month discovery phase. Here is how a project moves from your idea to working software.

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1

Discovery & Planning

We spend the first week understanding your users, your existing systems, and what the app actually needs to do on day one versus month six. We map out screen flows, API touchpoints, and any third-party integrations before the design phase starts, so nothing gets redesigned mid-build.

2

UI/UX Design

We build a clickable Figma prototype covering every core screen. You review it, request changes, and sign off before we write a single widget. This step saves more time than any other part of the process.

3

Development

We build in two-week sprints and share a testable build after each one. You install it on your own phone, tap through real functionality, and give feedback before the next sprint locks in. Because we are based in India, your feedback at end-of-day Eastern time becomes the first task our team sees at the start of their morning.

4

Testing & QA

We test on physical iOS and Android devices at multiple screen sizes, not just emulators. We run through edge cases like low connectivity, interrupted payments, and session timeouts because those are the scenarios that generate one-star reviews.

5

Launch

We handle App Store and Google Play submission, including screenshots, descriptions, age ratings, and compliance checklists. Both stores have review quirks and we have navigated them enough times to get apps approved without back-and-forth delays.

6

Support & Growth

After launch we stay on a monthly retainer that covers OS compatibility updates, crash monitoring via Firebase Crashlytics, and two to four hours of minor feature work per month. If you need a larger update, we scope it as a fixed project.

Why Choose Aneri Developers

Your Progress Happens Overnight

Our team is in Gandhinagar, India, which means we are building while you sleep. You send feedback at 5 PM Eastern and wake up to a new build ready to test. Most clients find the time zone gap actually speeds up their project.

Same Engineers Start to Finish

The Flutter developer who attends your kickoff call is the same person who submits your app to the App Store. We do not hand projects off between teams or bring in contractors mid-build.

Operating Since 2015

We have been building software for US businesses for over 11 years, with more than 500 projects delivered across 20-plus countries. Cross platform mobile is one of our most requested services, not a side offering.

Communication You Can Count On

Every project runs on Slack for daily updates, Zoom for weekly calls, and Loom for async walkthroughs when a text message cannot capture what we are showing you. You never need to chase us for a status.

Fixed Price, No Surprises

We quote a fixed price based on your requirements before work starts. If something genuinely changes scope, we discuss it openly and agree on the impact together. We do not send invoices for hours you did not approve.

NDA and Contract on Day One

We sign a mutual NDA and a project contract before any discovery work begins. You own all code, all assets, and all intellectual property outright. There is no licensing arrangement or code-holding clause.

Frequently Asked Questions

Common questions about cross platform app development.

Both ship to iOS and Android from one codebase, but Flutter compiles to native ARM code and renders its own UI rather than relying on platform components. In practice, Flutter apps tend to feel more consistent across Android devices with varied OS versions, which matters if your users are not all on flagship phones. We have built in both, and for most projects we recommend Flutter unless the client has a strong existing JavaScript team that will maintain the code themselves.

Most users will not notice. Flutter renders at 60fps on mid-range hardware and we follow platform-specific interaction patterns during design, so iOS users see iOS-style navigation and Android users see what they expect on Android. The areas where cross platform shows are usually complex custom animations or deep system integrations, and we flag those during discovery if they apply to your project.

We build both. A common setup is a Flutter front end connected to a Node.js or Laravel API with a MySQL database, all hosted on AWS. If you already have a backend and just need the app, we connect to your existing REST API. We also set up Firebase for projects that need real-time sync or push notifications without a custom backend.

It depends on scope, and we have seen the range run from around $8,000 for a straightforward internal tool to well over $60,000 for a marketplace with payments, user profiles, and a custom admin dashboard. We give you a fixed quote after a discovery call where we walk through your requirements in detail. There is no charge for that conversation.

A focused app with a clear scope typically takes 10 to 16 weeks from kickoff to App Store approval. Projects that require a custom backend, complex integrations, or multiple user roles take longer. The App Store review itself adds one to three days on the Apple side; Google Play is usually 24 to 48 hours. We build review time into the timeline so it does not come as a surprise.

Rejections happen, and we handle them. Common rejection reasons include missing privacy policy disclosures, incomplete app descriptions, or a guideline we needed to address in the UI. We know the review checklists well enough that first-submission approvals are the norm for us, but if a rejection comes back, we respond and resubmit the same day.

Yes. If your app needs deep Bluetooth LE hardware control, continuous background location processing, or tightly integrated ARKit or ARCore features, native gives you more direct access to those platform APIs. Flutter's plugin ecosystem covers most hardware scenarios, but when it does not, we will tell you before you spend money on the wrong approach.

The first step is a 30-minute call where you walk us through what you need and we ask the questions a spec document usually misses. After that, we send a written proposal with a fixed price and timeline. We sign the NDA and contract, you make the first milestone payment, and we start discovery the following week. Most first-time clients find the process more straightforward than they expected.

Tell us what your app needs to do

Share your requirements and we will review them, ask the right questions, and come back with a fixed-price proposal that covers both platforms from a single build.

Free Consultation
No Commitment
NDA on Day One

Describe Your Project

Include as much detail as you want. We typically reply within 24 hours.

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