Cross-Platform App Development
Cross-Platform App Development Company: One Codebase, Both Stores
One codebase for iOS and Android is the right call for most business apps and the wrong call for a few. Before you commit a budget to either route, it is worth knowing which of the two yours is. That is what this page is for, and we will tell you when native is the better answer.
Triple Protection Guarantee
- US-Registered Entity
- Signed IP Assignment
- Senior Engineers Only
Triple Protection Guarantee:
- US-Registered Entity
- Signed IP Assignment
- Senior Engineers Only
Years In Business
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Engineers On Staff
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Avg. Engineer Exp.
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Which Route Fits
Single Codebase
Two Stores
Native When Needed
We'll Say So
Timezone Overlap
Live Hours
IP Protection
Signed First
Delaware LLC
US Entity
Store Releases
Both Handled
Quality Control
Code Review
Shared Design System
One Source
Framework Fit
We Advise
IP Assignment
Signed
Delivery Overlap
Fixed
Hours
Code & IP Owner
You
Trusted By Startups
What Cross-Platform App Development Actually Means
Cross-platform app development means writing your app once, in one codebase, and shipping it to both the App Store and Google Play from that same code. The appeal is straightforward: one team, one set of screens, one bug fixed in one place instead of two. The catch is that everything the two platforms do differently still has to be handled somewhere. Handled openly, it is a saving. Ignored, it is the rebuild people warn you about.
Stallyons is registered in Delaware as a US company, and the engineers on your app work a time-zone window agreed before anything starts. Twelve-plus years in business, around thirty-five engineers on staff and delivery across six continents sit behind that. What matters more for this decision is that we will say when one codebase is the wrong answer. Heavy graphics and 3D work, deep operating-system integration and apps built around platform-specific hardware are usually better served by two native codebases.
What Cross-Platform Covers
One codebase, two stores: the same screens, logic and tests ship to iOS and Android together, so a fix lands once rather than twice and the two platforms stop drifting apart release by release.
Native where it earns its place: camera, maps, payments, Bluetooth and background work drop to native modules when the framework cannot do the job properly, and that boundary is agreed before the build.
Store releases handled: signing, provisioning, review submissions and staged rollouts on both stores, including the parts of Apple's review process that catch first-time publishers out.
The framework chosen for your app, not for our bench: usually React Native or Flutter, argued out against your own feature list at scoping and written into the plan you sign.
Cover you do not have to arrange: named engineers, briefed backups and decisions written down as they happen, so a holiday or a resignation never becomes your emergency.
One accountable vendor: one contract, one invoice and one entity for legal and finance to run diligence on, instead of a separate iOS shop and a separate Android shop.
What To Settle Before You Choose A Cross-Platform Route
- Write down what the app has to do with the device. Camera, offline, location, Bluetooth and background tasks are where the framework choice is actually decided.
- Ask which framework the vendor would pick and why. A shop that only ever answers with one name is describing its own bench, not your requirements.
- Agree who publishes. App Store Connect and Play Console should be your own accounts, with us added as users, never the other way round.
- Decide how far the two platforms may look different. Shared everything is cheapest; matching each platform's own conventions costs more and sometimes converts better.
- Check the third-party plugins the plan depends on. An unmaintained package is the most common reason a cross-platform build stalls a year after launch.
- Ask what happens if a screen turns out to need native code. The honest answer is a native module behind the same interface, not a rewrite of the app.
How To Start A Cross-Platform App Build
Every engagement starts with a free 45-minute scoping session. No slide deck, no sales script. You bring the feature list and the constraints; you leave with a framework recommendation, a clear scope and a timeline.
We are selective about new engagements and cap how many we run at once, because the vetting is the product. If we cannot staff your stack with engineers we would vouch for, we will tell you so.
Why Clients Choose Us
Full
Written IP Transfer
USA
Contract Entity
Yours
Tools & Accounts
Named
Senior Level
Ready to work out whether one codebase fits you?
Frameworks We Build With
Cross-Platform App Development Options
Nine ways to reach both platforms, each with its own page and its own honest case. Two of them are native rather than cross-platform, because sometimes that is the answer. The full range sits on the mobile services hub.
Not sure which framework fits? Let's work it out together.
Common Challenges
Why Do Cross-Platform Apps Go Wrong?
Six failure patterns behind almost every bad one-codebase story. None of them are arguments against the approach itself.
Wrong Fit Chosen
01
The app turned out to be a 3D product configurator, and one codebase was chosen because it was cheaper. Frame rates decided the outcome, not the budget, and the rebuild started in native six months later.
Native Work Ignored
02
Nobody budgeted for the native modules. Bluetooth, background location and the payment SDK all needed platform code, and each one arrived as a surprise.
One Codebase, Two UIs
03
The design was drawn once, for iOS, then bent onto Android late. What shipped looked borrowed on one platform, and the reviews said so within a fortnight.
Plugin Dead Ends
04
The build leaned on a community package that stopped being maintained. One operating-system update later, the app would not compile and nobody owned the fix.
Performance Found Late
05
Long lists, heavy images and animation were tested on a new phone and signed off. On a four-year-old mid-range Android, the same screens dropped frames and users left.
Nobody Owns The Stores
06
Store accounts sat in the vendor's name, so every release, certificate and policy reply went through them. Ownership needs to be yours from day one.
Recognise a few of these? Let's do it properly.
Our Cross-Platform Work
6 Cross-Platform App Development Services
Six ways to buy cross-platform capacity from one accountable vendor. Run one, or run several in parallel under a single contract.
New Cross-Platform Builds
01
A new app taken from scope to both stores on one codebase, with a named lead reporting to you, a written plan you approve first, and the native modules costed before anyone starts.
Framework Selection
02
A short paid engagement that ends in a written recommendation: one codebase or two, which framework, and what it will cost to maintain. Useful even if you build it elsewhere.
Native To Cross-Platform
03
Two native apps consolidated onto one codebase, screen by screen, with the old builds still shipping until the new one has earned the switch.
Store Release & Device QA
04
Testing across a real device matrix, not one new handset: older Android hardware, small screens, poor networks, then submission and staged rollout on both stores.
Backend & Integrations
05
The APIs, push notifications, payments and analytics behind the app, built alongside it so the mobile team is never blocked waiting on someone else's endpoint.
Maintenance & SDK Upkeep
06
Framework upgrades, operating-system releases and dependency churn handled on a schedule, or a standing team when you would rather add engineers directly.
Not sure which cross-platform service you need? Let's scope it.
Why Choose Us
What Makes Our Cross-Platform App Development Different
The details that decide whether one codebase works out, rather than the ones that demo well.
A US Legal Entity
01
Stallyons is registered in Delaware. Your contract, your invoice and your legal recourse sit with a US company, not an unknown one.
We Say When Native Wins
02
If your app is graphics-heavy or built around platform hardware, we will recommend two native codebases and explain the reasoning.
Overlap You Set
03
You choose the hours we share with your working day, and stand-ups, reviews and escalations all happen inside that window.
IP Locked Down First
04
NDA and IP assignment are signed before any repository, credential or design file changes hands. Everything produced on the work is yours.
Reviewed Code
05
Every merge is reviewed against an agreed definition of done, on your board, where you can read it yourself.
Stores Yours
06
App Store Connect and Play Console stay in your own accounts, with us added as users, so you can revoke access in a minute.
Ready to see what one codebase would look like here?
Our Process
From First Call To A Cross-Platform App In Six Steps
A build process designed to surface the native work early, before anyone commits a budget.
Discovery
Understand the app, the devices, hours and budget
Scoping
Agree the framework, scope and cost shape
Choose
Meet and approve the engineers on your account
Contracting
NDA, IP assignment, access and onboarding
Deliver
Work on your board, reviewed on merge
Release & Scale
Both stores, then iterate on what users do
Want to see how this maps to your roadmap?
Technology Stack
The Stack Behind Our Cross-Platform Apps
Frameworks, native modules, backends and release tooling, across every layer a mobile product needs.
Cross-Platform
React Native / TS
Flutter / Dart
Ionic / Capacitor
.NET / MAUI
TypeScript
Native Layer & Modules
Swift / iOS
Kotlin / Android
Java / Native
Android
Firebase / Notify
Backend & Data
Node.js / Nest
Python / APIs
PostgreSQL / MySQL
Redis Cache
Laravel / PHP APIs
Design & Testing
Figma / Design
Selenium QA
Tailwind CSS
Vue / Quasar Apps
Angular / Ionic
Cloud & Release
AWS / GCP / Azure
Docker / K8s
Terraform / IaC
GitHub Actions / CI
Datadog / Grafana
Industries We Serve
Cross-Platform Apps For Industries With Real Constraints
Engineers who already know your sector's rules spend month one shipping rather than asking. Pick yours below.
We know your sector. Let's plan the app around it.
How We Compare
Cross-Platform vs Native App Development
An honest look at your four build options.
| What You Care About | Two Native Codebases | Cross-Platform Framework | Web Wrapper / PWA | What We Usually Recommend |
|---|---|---|---|---|
| Time to reach both stores | Two builds, two timelines | One build, both stores | Fastest of the three | Cross-platform |
| Cost of the second platform | ✕ Close to double | Mostly shared code | Almost nothing | Cross-platform |
| Heavy graphics, 3D and games | Full hardware access | ✕ Hits a ceiling | ✕ Not suitable | Native, and we say so |
| Deep OS and hardware access | Available on day one | Native module needed | ✕ Browser limits apply | Native, and we say so |
| Feels right per platform | Platform conventions | Close, with design work | ✕ Reads as a website | Either, with a budget |
| Ongoing maintenance | ✕ Two of everything | One fix, both stores | One web codebase | Cross-platform |
| Store accounts in your name | Yours, either way | Yours, either way | Store review can refuse | Always yours |
See the difference for yourself
Complete Engagement
Everything Included In A Cross-Platform App Build
From Scoping to Contracting to Delivery, One Vendor
Here's everything included when you build cross-platform with us:
One Cross-Platform Build: No Hidden Fees, No Surprise Rebuilds.
Every cross-platform engagement includes all eight components above. One contract, one senior team, one predictable cost, no vendor sprawl.
🔒 No obligation. We'll deliver a detailed proposal within 48 hours.
Plus, Get These Free Bonuses
Free Framework Review
A written read on whether your app belongs on one codebase or two, which framework suits it, and what the native work is likely to be. Yours to keep.
Included Free
App Plan And Estimate
A phased build plan with scope, milestones, a device and store release path, and a transparent, itemized estimate for the app.
Included Free
Free Vendor Checklist
The questions we would ask any app vendor about frameworks, native modules, store accounts and upkeep, so you can test us the same way.
Included Free
Risk-Free Partnership
Our Cross-Platform Promise
We stand behind every engagement with commitments that protect your investment.
01
Route Agreed First
One codebase or two, the framework, the device matrix and the cost shape are written down and agreed before contracting, not later.
02
Built to Last
Senior developers, code review, automated tests, security and accessibility audits, and clean, documented code you fully own.
03
IP And Access Protected
NDA and IP assignment are signed before access, permissions are scoped per person, and your accounts stay under your control.
Start your cross-platform build with confidence, backed by our Triple Protection Guarantee.
Track Record
Engagements That Ship, Scale, and Compound
500+
Projects Delivered
29+
Service Categories
81%
Repeat Client Rate
4.9 ★
Clutch Rating
"We came to Stallyons after burning two years and four vendors on a multi-platform launch that kept slipping. They scoped it end-to-end — web app, iOS, Android, an AI summarization layer, and a Shopify integration — and shipped it in 22 weeks. One team, one budget, one quality bar. We've handed them three more engagements since."
Mark Sawyer
CEO/Founder
PlatinumLED
"Stallyons rebuilt our customer-facing portal, integrated three legacy systems, shipped an AI document analysis pipeline, and brought our compliance posture to SOC 2 — all under one engagement. The senior engineers on the team have shipped at companies five times our size. It's the best vendor decision we've made in a decade."
Mark Sawyer
CEO/Founder
PlatinumLED
FAQ
Frequently Asked Questions On Cross-Platform Apps
Cross-platform app development means building one codebase that ships to both the App Store and Google Play, instead of writing and maintaining two separate native apps. Frameworks such as React Native, Flutter, Ionic and .NET MAUI share the screens and the business logic across both platforms, then drop down to native code for the parts that differ. You get one team, one backlog and one release cycle instead of two.
Native means two codebases, one in Swift for iOS and one in Kotlin for Android, each written with the platform’s own tools. It gives you the best performance, access to new operating-system features on the day they ship, and full control over how the app feels. Cross-platform means one codebase serving both, which costs less to build and considerably less to maintain, at the price of a layer between your code and the hardware. Most business apps never notice that layer. Graphics-heavy apps do.
Cost follows the feature list, the device matrix and how much native work sits underneath, so a single number before scoping is guesswork. What moves it most is the number of screens, whether the app works offline, and which hardware features it touches. We scope first, then price, and itemize what each phase covers so you can cut before you commit rather than after.
Ask which framework they would pick for your app and why, and be wary if the answer never changes. Ask which parts will need native modules, and get that in writing before contracting. Check that App Store Connect and Play Console will be your own accounts. Then ask what happens when the framework releases a major version, because somebody has to do that work every year.
You do, from the first commit. NDA and IP assignment are signed before anyone gets repository access, with no licence-back and no shared ownership. App Store Connect, Play Console, repositories and design files sit in your own accounts from day one, and we work inside them as named users you can remove.
When the app leans on the hardware. Real-time 3D, games, heavy camera or video processing, augmented reality, and anything that must use a new operating-system feature the week it launches are all better in native code. The same applies if the interface has to follow each platform’s conventions exactly. Outside those cases, one codebase is usually the cheaper answer.
You set an overlap window before work starts, and stand-ups, reviews and escalations happen inside it, whether you sit in North America, the UK and Europe, the Middle East, Singapore, or Australia and New Zealand. Our team is based in Pakistan on UTC+5, which gives four-plus hours of daily overlap with most of those markets.
The common ones are picking one codebase for an app that needed two, unbudgeted native modules, a dependency that stops being maintained, and performance problems found on old devices after launch. We address them the same way each time: the framework decision written down at scoping, native work costed up front, and testing on a real device matrix.
Still have questions? Let's talk.
Schedule an appointment with us today!
Ready To Build One App For Both App Stores?
Get a free consultation. We'll go through the app, recommend one codebase or two, and send a written proposal.
