We build apps people keep on the home screen. Parix.ai is a mobile app development company offering custom mobile app development services for iOS and Android, native or cross-platform, from the first wireframe through to store launch, including design, release and support.
Our mobile application development services cover every platform decision you will face. We recommend the approach that fits your app, your budget and your team, and explain why, before anything is built.
Native iPhone and iPad apps built in Swift and SwiftUI. Our iOS app development services cover Apple Pay, HealthKit, widgets and Apple Watch where the app needs them, and every build is prepared for App Store review.
Best forApple-first audiences and apps that rely on iOS-only features.
Native Android apps in Kotlin and Jetpack Compose, tested across the screen sizes and OS versions your users actually have. Our Android app development services include Google Pay, Wear OS and Google Play release.
Best forAndroid-heavy markets, hardware access and company-issued devices.
One codebase for iOS and Android, which usually costs less to build and much less to maintain. Our cross platform app development services use Flutter or React Native, chosen for your app rather than out of habit.
Best forMost new apps that need both stores at launch.
Flutter app development services for apps that need a custom, highly designed interface with a consistent visual system across iOS and Android. One Dart codebase gives the team strong control over rendering and interaction.
Best forBrand-led interfaces and custom design systems.
React Native app development services for teams that already work in JavaScript or TypeScript, or have a React web app to share logic with. It uses platform-backed native components and can share application logic across iOS and Android.
Best forReact teams and products with a web side to share code with.
Internal tools for field teams, warehouses, clinics and franchises: the app only your company needs. Offline capture, barcode scanning, approvals and private distribution outside the public stores.
Best forReplacing paper, spreadsheets and phone calls to the office.
These six cover most of what people ask for. Whatever the category, the build is the same: fixed scope, weekly demos on a real device, and you own the code at the end.
Browse, cart and checkout that still work on one bar of signal in a lift. Where most shopping apps lose the sale.
The phone half of your SaaS product, built properly rather than a website in a wrapper with a splash screen.
Workouts, streaks and progress. The hard part is permissions and background tracking, and that is the part we get right.
Two audiences, one app. Buyers, sellers, listings, messages and payouts all have to hold together from day one.
Your internal systems in a pocket, so the field team stops phoning the office to ask what the system says.
The app only your company needs, because the off-the-shelf one does 60 percent of the job and fights you on the rest.
Roughly half our app work does not fit a category — a booking tool for a clinic, a stock-count app for a warehouse, a training app for a franchise, a driver app that has to work in a basement car park. If you can describe what it needs to do, we can tell you on one call whether it is a two-week job or a two-month one.
We pick the stack to fit the app, not the other way round. If one codebase for both platforms saves you money we will say so, and if it will not we will say that too. If the app needs a web side as well, that is handled by our web development team.
Native mobile app development means building the app once per platform: Swift for iOS and Kotlin for Android. Cross-platform means one codebase in Flutter or React Native that ships to both stores. Neither is better in general. One will be better for your app, and we tell you which during scoping.
| Native iOSSwift | Native AndroidKotlin | Cross-platformFlutter | Cross-platformReact Native | |
|---|---|---|---|---|
| Language | Swift, SwiftUI | Kotlin, Jetpack Compose | Dart | JavaScript or TypeScript |
| Codebases | One per platform | One per platform | One for iOS and Android | One for iOS and Android |
| Interface | Apple's native components | Android's native components | Flutter draws its own, identical on both | Uses each platform's native components |
| Best for | Deep Apple features, heavy graphics, Apple Watch | Hardware access, company devices, Wear OS | Custom, brand-led interfaces | React teams, logic shared with a web app |
| Trade-off | Android needs a second build | iOS needs a second build | Some device features need platform code | Some device features need native modules |
| Maintenance | Two codebases to keep up to date | One codebase, so updates cost less | ||
We go fully native when the app needs deep hardware access, heavy graphics, demanding background work, or a platform feature that cross-platform tools do not support yet.
For most other apps, one codebase wins on cost and speed. Our guide to mobile app development walks through the trade-offs in more detail.
Some apps are a few screens over a database. Others have to survive no signal, three user roles, an older ERP and an approval chain. As a custom mobile app development company, we plan for that second kind from the first call. If the app is part of a product you sell, see our SaaS product development service.
Capture works with no signal and syncs when the connection comes back, with conflict rules agreed up front rather than after the first lost record.
Field staff, managers, customers and admins each see the right screens and the right data, enforced on the server as well as in the app.
We connect to the ERP, CRM or database you already use, including older systems with awkward or undocumented APIs.
Multi-step sign-offs, notifications to the right person, and a record of who did what and when.
Most business apps need an admin dashboard. Our web development team builds it alongside the app, on the same data.
Start with one team or one site, then roll out without a rebuild. Internal apps can be distributed privately through Apple Business Manager and managed Google Play.
Our AI app development services add features that save users time, not a chatbot bolted onto the menu. We start from the task the user is trying to finish and work back to whether AI helps. The model work is shared with our AI integrations team.
In-app assistants that answer questions from your own content, such as help docs, product data or policies, and hand over to a person when they should.
Search that understands what people mean, not just the words they type, across products, documents or records.
Suggestions based on what each user does in the app: products, content, next steps or repeat orders.
Forms that fill themselves from a photo, a document or a voice note, then check the result before it is submitted.
Actions in the app that start work elsewhere, like tickets, emails or CRM updates, using our AI workflow automation work.
Connecting the app to cloud or on-device models, with cost, speed and privacy trade-offs explained before you choose. API keys stay on the server, never in the app.
An app is rarely the whole system. It has to read from and write to the tools your business already runs. We plan every integration during discovery, so none of them turns up as a surprise halfway through the build.
Your own or third-party REST and GraphQL APIs, with retries and error handling built for patchy mobile connections. If the API does not exist yet, our web development team builds it.
Live data and write-back to the CRM or ERP you already run, off-the-shelf or custom, instead of nightly exports.
Stripe, Apple Pay and Google Pay for one-off and recurring payments, plus in-app subscriptions where store rules require them.
Catalogue, cart, checkout and orders kept in sync with your Shopify or WooCommerce store.
Database, file storage, real-time sync and serverless functions, on whichever fits your data and your budget.
Email, Apple and Google sign-in, magic links, single sign-on for internal apps, and Face ID or fingerprint unlock.
Order updates, reminders and alerts through Apple and Google push services, with the permission prompt shown when it makes sense to the user.
Language, vision and speech models connected through our AI integrations service.
Our mobile app UI/UX design services start on a phone, not a desktop monitor. Wireframes become a clickable prototype you can hold, tap through and show to real users before production code is written. Design is led by our Branding & UI/UX team, so the app matches the rest of your brand.
Testing runs through the whole build, not a week at the end. Every build is tested on real devices before it reaches you, and nothing goes to the stores without a release checklist.
Automated tests for core logic and critical flows, plus hands-on testing of every release candidate.
Start-up time, scrolling, memory and battery use checked on mid-range phones, not just the newest flagship.
Tested across the iOS and Android versions and screen sizes your users have, agreed during scoping.
Camera, location, health and notification access requested only when needed, with a clear reason. Store review checks this closely.
Secure sign-in, tokens kept in the phone's secure storage, encrypted connections, and no secret keys shipped inside the app.
Crash and error reporting from the first test build, so you hear about a problem before your users tell you.
A final regression pass plus a check of store listings, privacy details and permission wording before every submission.
A separate test version on your phone through TestFlight and Play internal testing, so changes are checked before they go live.
Same process on every app, from a two-screen internal tool to a marketplace: discovery, UX/UI, two-week build cycles, testing, launch and support. You get a working build at the end of each cycle, so progress is something you can open, not something you’re told about.
We map the screens, the data behind them, and the one thing the app has to get right.
Wireframes then real screens from our UI/UX design team, reviewed on a phone rather than a desktop monitor.
Two-week cycles, with weekly builds on your actual device through TestFlight and Play internal testing.
Each build is tested on real devices before it reaches you, with a full regression pass before release.
We handle App Store and Google Play submission and review, including any resubmissions.
Post-launch fixes, then we hand you the repo, the accounts and the docs.
The problem, what we built, and the number that moved. Every project below names the constraint we were working against and what changed after launch. No screenshot galleries with nothing underneath.
3 days
→ same day
Time from job completed to invoice raised.
Every job finished on site, then waited. The sheet went in the van, the van came back Friday, someone typed it in on Monday, and the invoice went out Tuesday. Customers were being billed for work they had half forgotten.
We built an app that captures the job on site — photos, parts used, signature — and pushes it straight into their existing ERP. It works with no signal and syncs when the phone finds one.
The parts that usually turn up as a surprise invoice are in the fixed price. Store submission, push, analytics, crash reporting, staging and post-launch fixes are all quoted up front. The total only changes if you change the scope.
Launch is the start of the app's life, not the end of the project. Apple and Google release new OS versions and change store rules every year, and an app nobody maintains can stop working properly or be removed from the stores. Every build includes 30 days of support. After that, you choose.
Whether you hire a mobile app development company in the USA or work with a distributed product team, the questions that matter are the same: who owns the code, how you see progress, and whether the app is ready for U.S. users, payments and store rules.
Here is how each of those works with us.
It depends on the scope: how many screens, how many user types, which integrations, and whether you need iOS, Android or both. We do not quote from a template. After a 30-minute call we map the screens, and you get a fixed scope and price within three days. That price only changes if you change the scope.
You are testing on a real device from week two. Store launch is typically eight weeks for a focused app and longer for something with payments, multiple user types or several integrations.
Yes, either or both. If most of your users are on one platform, we can launch there first and add the second later. With a cross-platform codebase, that second launch is mostly testing and store setup rather than a rebuild.
Usually React Native or Flutter, because one codebase for both platforms costs less to build and much less to maintain. We go fully native when the app needs deep hardware access or heavy graphics, and we tell you which it is during scoping rather than after. Our guide to mobile app development walks through the trade-offs in more detail.
Neither, in general. Flutter uses its own rendering engine, so it suits apps that need a custom, highly designed interface with strong visual consistency across platforms. React Native uses each platform's own components and JavaScript or TypeScript, so it suits teams with React experience or a web app to share code with. We recommend one during scoping and explain why.
Yes: assistants, smarter search, recommendations, and forms that fill themselves from photos or documents. We connect the app to the right model through our AI integrations service, keep API keys on the server, and explain running costs before you commit, because AI features have a usage cost that ordinary features do not.
Yes, it is in the fixed price. We prepare the store listings, privacy details and review notes, and submit to both stores. If a store review raises an issue, we deal with the review notes and resubmit at no extra cost.
You do, from day one. We work in your GitHub organisation and publish under your Apple and Google developer accounts. If you part ways with us, nothing needs migrating.
Often yes. We start with a paid audit of the existing codebase and give you an honest answer about whether it is worth continuing or rebuilding. Sometimes the answer is rebuild, and we will say so with reasons.
Either your team runs it, which is what the handover session is for, or you move to a monthly retainer for updates and OS version changes. No lock-in either way.
Yes. We work with businesses in the United States. Apps publish under your own Apple and Google developer accounts, progress is shared through weekly demos on a live link, and you can reach us on +1 (504) 229-0677.
Yes. We connect to the CRM, ERP and APIs you already use, including custom and older systems, and plan each integration during discovery. If the app needs a new API or an admin dashboard behind it, our web development team builds it alongside.
Tell us what the app needs to do. Thirty minutes on a call, we map the screens, and you get a fixed scope and price within three days.
