Cross-Platform App Development
ONE CODEBASEOne codebase covers most of a typical business app. The remainder — platform behaviour, background work, anything close to the hardware — still has to be written twice, or written natively. We tell you which app you have before the estimate, not halfway through it.
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One codebase, shipped to both stores
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What We Build Cross-Platform
A single codebase is a means, not a goal. What suits a content-heavy app rarely suits a device-heavy one, so here is what each framework is genuinely good at — and where it stops.
A TypeScript codebase running on Hermes, with the New Architecture removing most of the old bridge overhead. The right fit when you already have React engineers — the cost is keeping native tooling close at hand for the screens that need it.
Xamarin has reached end of support; .NET MAUI is its successor. If you still run a Xamarin.Forms app we keep it building against current SDKs, then cost the move to MAUI honestly — including the case for leaving .NET altogether.
Flutter draws every pixel itself, so the interface is identical on both platforms and animation stays predictable. You trade a larger binary, a separate language, and a platform channel each time you need something the framework doesn't already wrap.
PhoneGap is retired and Cordova is in maintenance. If one is still in production we keep it signing against current SDKs, then give you a costed route to Capacitor, React Native or native — rewriting only what genuinely has to be rewritten.
Unity for anything with a game loop. Game work is a different discipline from app work: asset budgets, frame pacing on a phone that throttles when it warms up, and store rules that treat in-app purchases differently.
A short engagement ending in a recommendation you can act on: which framework, what it costs to maintain, which parts will need native code — and whether cross-platform is simply the wrong answer for the app you described.
Moving a native or hybrid app onto a shared codebase screen by screen rather than in one jump. The existing app keeps shipping while the new one takes over routes, so users only ever see one app.
Wiring the app to APIs, payments, identity, analytics and back-office systems — with the mobile-specific parts handled properly: offline queues, retries, idempotency, and token refresh that doesn't log people out.
Apps distributed through MDM rather than the public stores: single sign-on, device policy, per-environment builds, and a signed release pipeline nobody has to run by hand. Regulatory scope agreed per engagement.
Still deciding between React Native and Flutter?
Describe the app in a paragraph. We will tell you whether one codebase fits — and what it would cost you if it doesn't.
Why Choose Aryavos
The case for cross-platform is real, but it is rarely the case people make for it. Here is what a shared codebase actually buys you, and the places where it charges you back.
React Native, Flutter, Ionic and Capacitor solve slightly different problems. The choice follows your team, the UI you have in mind and the native work you already know is coming — not which one we happen to enjoy.
The real saving is rarely the code. It is not running two teams, two backlogs and two release calendars that quietly drift apart. Features land on both platforms in the same week, or not at all.
A shared codebase does not hand you platform feel for free. Navigation gestures, share sheets, date pickers, keyboard behaviour and the Android back button all differ, and each has to be handled on purpose.
Lists, animation and startup are fine in a modern cross-platform stack. What still hurts is heavy media processing, sustained background work, and anything that crosses into native code on every frame.
Automated builds producing a signed IPA and AAB from the same commit, with the store-specific steps scripted, so shipping a release stops being an event on the calendar.
A shared codebase ships the same mistake to both platforms at once. Tokens in Keychain and Keystore, certificate pinning, no secrets in the bundle — and the JavaScript or Dart bundle treated as readable, because it is.
Cross-platform adds a layer that has to be kept current. Framework majors, native modules that fall behind, and two OS releases a year all land on one codebase. That work is planned for, not discovered.
The app is only half the system. We build the API and sync layer alongside it — deployed to your cloud account or your own hardware — so both clients talk to something you control.
None of these is best in general; each is best for a particular kind of app. The differences rarely show up in a demo — they show up eighteen months later, in maintenance.
A JavaScript engine driving real native views. The New Architecture replaced the old asynchronous bridge, so most of the historic jank around long lists and gestures is gone. Biggest ecosystem, and the easiest of these to hire for.
Dart compiled ahead of time, with Flutter rendering its own widgets rather than the platform's. That buys identical UI and predictable frame timing; it costs binary size and a language most web teams don't already write.
Xamarin support has ended and .NET MAUI is the supported path forward. It still earns its place where a C# team and a .NET back end already exist — but the package ecosystem is thinner, so expect to write more yourself.
PhoneGap was retired and Cordova is in maintenance. It is listed here because a great many of these apps are still in production. New builds belong on Capacitor or a native-rendering framework instead.
Web UI in a native shell through Capacitor, using Angular, React or Vue. Sensible when the app is essentially your web product on a phone and the team is a web team. Less so when scroll feel and gesture fidelity are the whole point.
The pieces that usually sit alongside a cross-platform app
Inference on the device where latency or privacy demands it, a hosted API where the model is too large to ship. Both reachable from the same codebase.
Events defined before release rather than bolted on afterwards, dashboards split by platform, and funnels that show which of the two is really losing people.
The API, authentication, storage and push infrastructure behind the app — built in your own cloud account and handed over with the code.
ARKit and ARCore reach the app through platform channels or native modules. Cross-platform does not remove that native work; it contains it.
Watch apps are native on both platforms. The shared codebase gives you the phone app; each companion is written per platform against the same data layer.
Encryption in transit and at rest, secure API design, tokens in platform secure storage — and a shipped bundle treated as public, because a JavaScript or Dart bundle can be read.
Five steps, plus one decision that comes before all of them: whether a shared codebase is right for this app at all.
We scope the app and settle the framework question first, because it shapes everything after it. You get a roadmap with milestones, an estimate, and an early list of the parts we expect will need native code.
One design system, two platforms. We decide deliberately where the app should look identical and where it should defer to the platform — navigation, typography, date pickers and the Android back button are usually the latter.
Shared code for screens, state and data; native modules for everything else. Builds reach TestFlight and the Play internal track early, so both platforms are exercised throughout rather than Android being checked at the end.
Automated tests against both targets plus manual passes on real hardware — including the older mid-range Android that shared codebases tend to punish. Then submission, staged rollout, and a close watch on crash rates.
Framework majors, native modules falling behind, two OS releases a year, and analytics telling you which platform the problem is actually on. Cross-platform is one codebase but still two runtimes.
The framework decision shifts by sector. A claims portal and a live-streaming app share almost nothing but the word app, and only one of them sits comfortably on a shared codebase.
Patient portals, telehealth and clinician tools. Mostly forms, records and scheduling, which a shared codebase handles well — the care goes into PHI on the device, session expiry and audit trails. Designed to support HIPAA obligations scoped per engagement.
Payments, trading and analytics. Cross-platform is a fair fit until device attestation, tamper detection and hardware-backed keys enter the picture — those parts are native on both sides regardless of framework.
Catalogues, ticketing and audience tools sit happily on shared code. Video playback, DRM and picture-in-picture do not — those go through native players wrapped for both platforms, and we say so up front.
Storefronts, loyalty and stock apps — close to the ideal case for one codebase. The work that decides success is image budgets, a cached catalogue and a checkout that survives the app being backgrounded mid-payment.
Personnel records, payroll and benefits — internal apps usually distributed by MDM rather than the public stores, with single sign-on and role-based access doing most of the heavy lifting.
Policy servicing and claims, where the app is a camera and a form: photos captured at the roadside, queued while there is no signal, and uploaded intact once there is.
Courses, enrolment and learning platforms. Shared code covers nearly all of it; the exceptions are downloaded lessons, background media playback and keeping progress in step across a phone, a tablet and the web.
Booking flows and itineraries, built on the assumption that the network will be gone exactly when the boarding pass is needed. Local storage first, sync second, wallet passes native on both platforms.
Retail banking and wallets. One codebase for the account and transaction screens; native modules for biometric prompts, secure enclave keys and anything a regulator will want to see evidence of.
Cost, process, maintenance, and the question of whether it will feel native. If yours isn't here, Ask us directly.
The problem, who it's for, and where you are now. That's enough for us to come back with something useful.
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What happens after you send it
A developer reads it, not an auto-responder. Expect questions about scope and constraints first, then a suggested way to start.
